diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..3ef5eda
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,47 @@
+{
+  "extends": "eslint:recommended",
+  "env": {
+    "node": true,
+    "mocha": true,
+    "es6": true
+  },
+  "parserOptions": {
+    "ecmaVersion": 9,
+    "sourceType": "module",
+    "ecmaFeatures" : {
+      "globalReturn": false,
+      "impliedStrict": true,
+      "jsx": false
+    }
+  },
+  "rules": {
+    "indent": [
+      "error",
+      2
+    ],
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "always"
+    ],
+    "no-console": [
+      "error"
+    ],
+    "no-unused-vars": [
+      "error", 
+      { 
+        "vars": "all",
+        "args": "none",
+        "ignoreRestSiblings": false 
+      }
+    ]
+  }
+}
+  
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index fc339ca..0901cc5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,7 @@ npm-debug.log*~
 auto-save-list
 tramp
 .\#*
+.vscode
 
 # Org-mode
 .org-id-locations
diff --git a/.jshintignore b/.jshintignore
deleted file mode 100644
index 3c3629e..0000000
--- a/.jshintignore
+++ /dev/null
@@ -1 +0,0 @@
-node_modules
diff --git a/.jshintrc b/.jshintrc
deleted file mode 100644
index 441e993..0000000
--- a/.jshintrc
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "bitwise": true,
-  "curly": true,
-  "eqeqeq": true,
-  "esnext": true,
-  "expr": true,
-  "globalstrict": false,
-  "immed": true,
-  "indent": 2,
-  "jquery": true,
-  "latedef": false,
-  "mocha": true,
-  "newcap": true,
-  "noarg": true,
-  "node": true,
-  "noyield": true,
-  "predef": ["-Promise"],
-  "quotmark": "single",
-  "regexp": true,
-  "smarttabs": true,
-  "strict": false,
-  "trailing": false,
-  "undef": true,
-  "unused": true,
-  "white": false
-}
diff --git a/lib/grant-types/authorization-code-grant-type.js b/lib/grant-types/authorization-code-grant-type.js
index 7eae70f..97c1267 100644
--- a/lib/grant-types/authorization-code-grant-type.js
+++ b/lib/grant-types/authorization-code-grant-type.js
@@ -133,21 +133,21 @@ AuthorizationCodeGrantType.prototype.getAuthorizationCode = function(request, cl
  * @see https://tools.ietf.org/html/rfc6749#section-4.1.3
  */
 
- AuthorizationCodeGrantType.prototype.validateRedirectUri = function(request, code) {
-   if (!code.redirectUri) {
-     return;
-   }
+AuthorizationCodeGrantType.prototype.validateRedirectUri = function(request, code) {
+  if (!code.redirectUri) {
+    return;
+  }
 
-   var redirectUri = request.body.redirect_uri || request.query.redirect_uri;
+  var redirectUri = request.body.redirect_uri || request.query.redirect_uri;
 
-   if (!is.uri(redirectUri)) {
-     throw new InvalidRequestError('Invalid request: `redirect_uri` is not a valid URI');
-   }
+  if (!is.uri(redirectUri)) {
+    throw new InvalidRequestError('Invalid request: `redirect_uri` is not a valid URI');
+  }
 
-   if (redirectUri !== code.redirectUri) {
-     throw new InvalidRequestError('Invalid request: `redirect_uri` is invalid');
-   }
- };
+  if (redirectUri !== code.redirectUri) {
+    throw new InvalidRequestError('Invalid request: `redirect_uri` is invalid');
+  }
+};
 
 /**
  * Revoke the authorization code.
diff --git a/lib/models/token-model.js b/lib/models/token-model.js
index c6bc3f8..37bb133 100644
--- a/lib/models/token-model.js
+++ b/lib/models/token-model.js
@@ -47,7 +47,7 @@ function TokenModel(data, options) {
     this.customAttributes = {};
 
     for (var key in data) {
-      if (data.hasOwnProperty(key) && (modelAttributes.indexOf(key) < 0)) {
+      if ( Object.prototype.hasOwnProperty.call(data, key) && (modelAttributes.indexOf(key) < 0)) {
         this.customAttributes[key] = data[key];
       }
     }
diff --git a/lib/token-types/bearer-token-type.js b/lib/token-types/bearer-token-type.js
index 9124cb2..9440849 100644
--- a/lib/token-types/bearer-token-type.js
+++ b/lib/token-types/bearer-token-type.js
@@ -48,7 +48,7 @@ BearerTokenType.prototype.valueOf = function() {
   }
 
   for (var key in this.customAttributes) {
-    if (this.customAttributes.hasOwnProperty(key)) {
+    if ( Object.prototype.hasOwnProperty.call(this.customAttributes, key) ) {
       object[key] = this.customAttributes[key];
     }
   }
diff --git a/lib/validator/is.js b/lib/validator/is.js
index 07af6cb..a240e93 100644
--- a/lib/validator/is.js
+++ b/lib/validator/is.js
@@ -1,18 +1,22 @@
 'use strict';
+/* eslint-disable no-control-regex */
 
 /**
  * Validation rules.
  */
 
 var rules = {
-  NCHAR: /^[\u002D|\u002E|\u005F|\w]+$/,
-  NQCHAR: /^[\u0021|\u0023-\u005B|\u005D-\u007E]+$/,
-  NQSCHAR: /^[\u0020-\u0021|\u0023-\u005B|\u005D-\u007E]+$/,
-  UNICODECHARNOCRLF: /^[\u0009|\u0020-\u007E|\u0080-\uD7FF|\uE000-\uFFFD|\u10000-\u10FFFF]+$/,
+  NCHAR: /^[\u002D\u002E\u005F\w]+$/,
+  NQCHAR: /^[\u0021\u0023-\u005B\u005D-\u007E]+$/,
+  NQSCHAR: /^[\u0020-\u0021\u0023-\u005B\u005D-\u007E]+$/,
+  UNICODECHARNOCRLF: /^[\u0009\u0020-\u007E\u0080-\uD7FF\uE000-\uFFFD]+$/,
+  UNICODECHARNOCRLF_EXTENDED: /^[\u{10000}-\u{10FFFF}]+$/u,
   URI: /^[a-zA-Z][a-zA-Z0-9+.-]+:/,
   VSCHAR: /^[\u0020-\u007E]+$/
 };
 
+/* eslint-enable no-control-regex */
+
 /**
  * Export validation functions.
  */
@@ -57,7 +61,12 @@ module.exports = {
    */
 
   uchar: function(value) {
-    return rules.UNICODECHARNOCRLF.test(value);
+    // manually test \u10000-\u10FFFF
+    if (rules.UNICODECHARNOCRLF.test(value)) {
+      return true;
+    }
+
+    return rules.UNICODECHARNOCRLF_EXTENDED.test(value);
   },
 
   /**
diff --git a/package-lock.json b/package-lock.json
index b749db8..0317e2f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -279,6 +279,95 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@eslint/eslintrc": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-1.0.2.tgz",
+      "integrity": "sha512-x1ZXdEFsvTcnbTZgqcWUL9w2ybgZCw/qbKTPQnab+XnYA2bMQpJCh+/bBzCRfDJaJdlrrQlOk49jNtru9gL/6Q==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.3.2",
+        "espree": "^9.0.0",
+        "globals": "^13.9.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "globals": {
+          "version": "13.11.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-13.11.0.tgz",
+          "integrity": "sha512-08/xrJ7wQjK9kkkRoI3OFUBbLx4f+6x3SGwcPvQ0QH6goFDrOU2oyAWrmh3dJezu65buo+HBMzAMQy6rovVC3g==",
+          "dev": true,
+          "requires": {
+            "type-fest": "^0.20.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "strip-json-comments": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
+          "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
+          "dev": true
+        },
+        "type-fest": {
+          "version": "0.20.2",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
+          "integrity": "sha512-Ne+eE4r0/iWnpAxD852z3A+N0Bt5RN//NjJwRd2VFHEmrywxf5vsZlh4R6lixl6B+wz/8d+maTSAkN1FIkI3LQ==",
+          "dev": true
+        }
+      }
+    },
+    "@humanwhocodes/config-array": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.6.0.tgz",
+      "integrity": "sha512-JQlEKbcgEUjBFhLIF4iqM7u/9lwgHRBcpHrmUNCALK0Q3amXN6lxdoXLnF0sm11E9VqTmBALR87IlUg1bZ8A9A==",
+      "dev": true,
+      "requires": {
+        "@humanwhocodes/object-schema": "^1.2.0",
+        "debug": "^4.1.1",
+        "minimatch": "^3.0.4"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.2.tgz",
+          "integrity": "sha512-mOp8wKcvj7XxC78zLgw/ZA+6TSgkoE2C/ienthhRD298T7UNwAg9diBpLRxC0mOezLl4B0xV7M0cCO6P/O0Xhw==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
+    "@humanwhocodes/object-schema": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@humanwhocodes/object-schema/-/object-schema-1.2.0.tgz",
+      "integrity": "sha512-wdppn25U8z/2yiaT6YGquE6X8sSv7hNMWSXYSSU1jGv/yd6XqjXgTDJ8KP4NgjTXfJ3GbRjeeb8RTV7a/VpM+w==",
+      "dev": true
+    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -334,6 +423,18 @@
       "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ==",
       "dev": true
     },
+    "acorn": {
+      "version": "8.5.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.5.0.tgz",
+      "integrity": "sha512-yXbYeFy+jUuYd3/CDcg2NkIYE991XYX/bje7LmjJigUciaeO1JR4XxXgCIV1/Zc/dRuFEyw1L0pbA+qynJkW5Q==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
+      "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
+      "dev": true
+    },
     "aggregate-error": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
@@ -344,6 +445,24 @@
         "indent-string": "^4.0.0"
       }
     },
+    "ajv": {
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^3.1.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true
+    },
     "ansi-regex": {
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
@@ -455,6 +574,12 @@
         "write-file-atomic": "^3.0.0"
       }
     },
+    "callsites": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
+      "dev": true
+    },
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
@@ -504,16 +629,6 @@
       "integrity": "sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==",
       "dev": true
     },
-    "cli": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/cli/-/cli-1.0.1.tgz",
-      "integrity": "sha1-IoF1NPJL+klQw01TLUjsvGIbjBQ=",
-      "dev": true,
-      "requires": {
-        "exit": "0.1.2",
-        "glob": "^7.1.1"
-      }
-    },
     "cliui": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
@@ -579,15 +694,6 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
-    "console-browserify": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/console-browserify/-/console-browserify-1.1.0.tgz",
-      "integrity": "sha1-8CQcRXMKn8YyOyBtvzjtx0HQuxA=",
-      "dev": true,
-      "requires": {
-        "date-now": "^0.1.4"
-      }
-    },
     "convert-source-map": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.8.0.tgz",
@@ -597,12 +703,6 @@
         "safe-buffer": "~5.1.1"
       }
     },
-    "core-util-is": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
-    },
     "cross-spawn": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
@@ -614,12 +714,6 @@
         "which": "^2.0.1"
       }
     },
-    "date-now": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/date-now/-/date-now-0.1.4.tgz",
-      "integrity": "sha1-6vQ5/U1ISK105cx9vvIAZyueNFs=",
-      "dev": true
-    },
     "debug": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
@@ -644,6 +738,12 @@
         "type-detect": "^4.0.0"
       }
     },
+    "deep-is": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.4.tgz",
+      "integrity": "sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==",
+      "dev": true
+    },
     "default-require-extensions": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/default-require-extensions/-/default-require-extensions-3.0.0.tgz",
@@ -659,53 +759,13 @@
       "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
       "dev": true
     },
-    "dom-serializer": {
-      "version": "0.2.2",
-      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
-      "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
-      "dev": true,
-      "requires": {
-        "domelementtype": "^2.0.1",
-        "entities": "^2.0.0"
-      },
-      "dependencies": {
-        "domelementtype": {
-          "version": "2.2.0",
-          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.2.0.tgz",
-          "integrity": "sha512-DtBMo82pv1dFtUmHyr48beiuq792Sxohr+8Hm9zoxklYPfa6n0Z3Byjj2IV7bmr2IyqClnqEQhfgHJJ5QF0R5A==",
-          "dev": true
-        },
-        "entities": {
-          "version": "2.2.0",
-          "resolved": "https://registry.npmjs.org/entities/-/entities-2.2.0.tgz",
-          "integrity": "sha512-p92if5Nz619I0w+akJrLZH0MX0Pb5DX39XOwQTtXSdQQOaYH03S1uIQp4mhOZtAXrxq4ViO67YTiLBo2638o9A==",
-          "dev": true
-        }
-      }
-    },
-    "domelementtype": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
-      "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w==",
-      "dev": true
-    },
-    "domhandler": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.3.0.tgz",
-      "integrity": "sha1-LeWaCCLVAn+r/28DLCsloqir5zg=",
-      "dev": true,
-      "requires": {
-        "domelementtype": "1"
-      }
-    },
-    "domutils": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.5.1.tgz",
-      "integrity": "sha1-3NhIiib1Y9YQeeSMn3t+Mjc2gs8=",
+    "doctrine": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-3.0.0.tgz",
+      "integrity": "sha512-yS+Q5i3hBf7GBkd4KG8a7eBNNWNGLTaEwwYWUijIYM7zrlYDM0BFXHjjPWlWZ1Rg7UaddZeIDmi9jF3HmqiQ2w==",
       "dev": true,
       "requires": {
-        "dom-serializer": "0",
-        "domelementtype": "1"
+        "esutils": "^2.0.2"
       }
     },
     "electron-to-chromium": {
@@ -720,11 +780,14 @@
       "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
-    "entities": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/entities/-/entities-1.0.0.tgz",
-      "integrity": "sha1-sph6o4ITR/zeZCsk/fyeT7cSvyY=",
-      "dev": true
+    "enquirer": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npmjs.org/enquirer/-/enquirer-2.3.6.tgz",
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+        "is-extglob": "^2.1.1"
+      }
+    },
     "is-stream": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.1.tgz",
@@ -1101,29 +1479,17 @@
       "integrity": "sha512-OYu7XEzjkCQ3C5Ps3QIZsQfNpqoJyZZA99wd9aWd05NCtC5pWOkShK2mkL6HXQR6/Cy2lbNdPlZBpuQHXE63gA==",
       "dev": true
     },
-    "jshint": {
-      "version": "2.13.0",
-      "resolved": "https://registry.npmjs.org/jshint/-/jshint-2.13.0.tgz",
-      "integrity": "sha512-Nd+md9wIeyfDK+RGrbOBzwLONSTdihGMtyGYU/t7zYcN2EgUa4iuY3VK2oxtPYrW5ycTj18iC+UbhNTxe4C66g==",
-      "dev": true,
-      "requires": {
-        "cli": "~1.0.0",
-        "console-browserify": "1.1.x",
-        "exit": "0.1.x",
-        "htmlparser2": "3.8.x",
-        "lodash": "~4.17.21",
-        "minimatch": "~3.0.2",
-        "shelljs": "0.3.x",
-        "strip-json-comments": "1.0.x"
-      },
-      "dependencies": {
-        "lodash": {
-          "version": "4.17.21",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-          "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==",
-          "dev": true
-        }
-      }
+    "json-schema-traverse": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+      "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+      "dev": true
+    },
+    "json-stable-stringify-without-jsonify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/json-stable-stringify-without-jsonify/-/json-stable-stringify-without-jsonify-1.0.1.tgz",
+      "integrity": "sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=",
+      "dev": true
     },
     "json5": {
       "version": "2.2.0",
@@ -1148,6 +1514,16 @@
       "integrity": "sha512-ApcjaOdVTJ7y4r08xI5wIqpvwS48Q0PBG4DJROcEkH1f8MdAiNFyFxz3xoL0LWAVwjrwPYZdVHHxhRHcx/uGLA==",
       "dev": true
     },
+    "levn": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
+      "integrity": "sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "^1.2.1",
+        "type-check": "~0.4.0"
+      }
+    },
     "locate-path": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
@@ -1168,12 +1544,27 @@
       "integrity": "sha1-+wMJF/hqMTTlvJvsDWngAT3f7bI=",
       "dev": true
     },
+    "lodash.merge": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
+      "integrity": "sha512-0KpjqXRVvrYyCsX1swR/XTK0va6VQkQM6MNo7PqW77ByjAhoARA8EfrP1N4+KlKj8YS0ZUCtRT/YUuhyYDujIQ==",
+      "dev": true
+    },
     "lolex": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/lolex/-/lolex-4.2.0.tgz",
       "integrity": "sha512-gKO5uExCXvSm6zbF562EvM+rd1kQDnB9AZBbiQVzf1ZmdDpxUSvpnAaVOP83N/31mRK8Ml8/VE8DMvsAZQ+7wg==",
       "dev": true
     },
+    "lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dev": true,
+      "requires": {
+        "yallist": "^4.0.0"
+      }
+    },
     "make-dir": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-3.1.0.tgz",
@@ -1266,6 +1657,12 @@
       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
       "dev": true
     },
+    "natural-compare": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/natural-compare/-/natural-compare-1.4.0.tgz",
+      "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
+      "dev": true
+    },
     "nise": {
       "version": "1.5.3",
       "resolved": "https://registry.npmjs.org/nise/-/nise-1.5.3.tgz",
@@ -1349,6 +1746,20 @@
         "wrappy": "1"
       }
     },
+    "optionator": {
+      "version": "0.9.1",
+      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",
+      "integrity": "sha512-74RlY5FCnhq4jRxVUPKDaRwrVNXMqsGsiW6AJw4XK8hmtm10wC0ypZBLw5IIp85NZMr91+qd1RvvENwg7jjRFw==",
+      "dev": true,
+      "requires": {
+        "deep-is": "^0.1.3",
+        "fast-levenshtein": "^2.0.6",
+        "levn": "^0.4.1",
+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.3"
+      }
+    },
     "p-limit": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
@@ -1394,6 +1805,15 @@
         "release-zalgo": "^1.0.0"
       }
     },
+    "parent-module": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz",
+      "integrity": "sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==",
+      "dev": true,
+      "requires": {
+        "callsites": "^3.0.0"
+      }
+    },
     "path-exists": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-4.0.0.tgz",
@@ -1442,6 +1862,12 @@
         "find-up": "^4.0.0"
       }
     },
+    "prelude-ls": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+      "dev": true
+    },
     "process-on-spawn": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/process-on-spawn/-/process-on-spawn-1.0.0.tgz",
@@ -1451,6 +1877,12 @@
         "fromentries": "^1.2.0"
       }
     },
+    "progress": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
+      "integrity": "sha512-7PiHtLll5LdnKIMw100I+8xJXR5gW2QwWYkT6iJva0bXitZKa/XMrSbdmg3r2Xnaidz9Qumd0VPaMrZlF9V9sA==",
+      "dev": true
+    },
     "promisify-any": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/promisify-any/-/promisify-any-2.0.1.tgz",
@@ -1468,17 +1900,17 @@
         }
       }
     },
-    "readable-stream": {
-      "version": "1.1.14",
-      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
-      "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
-      "dev": true,
-      "requires": {
-        "core-util-is": "~1.0.0",
-        "inherits": "~2.0.1",
-        "isarray": "0.0.1",
-        "string_decoder": "~0.10.x"
-      }
+    "punycode": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+      "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+      "dev": true
+    },
+    "regexpp": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.2.0.tgz",
+      "integrity": "sha512-pq2bWo9mVD43nbts2wGv17XLiNLya+GklZ8kaDLV2Z08gDCsGpnKn9BFMepvWuHCbyVvY7J5o5+BVvoQbmlJLg==",
+      "dev": true
     },
     "release-zalgo": {
       "version": "1.0.0",
@@ -1548,12 +1980,6 @@
       "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
       "dev": true
     },
-    "shelljs": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz",
-      "integrity": "sha1-NZbmMHp4FUT1kfN9phg2DzHbV7E=",
-      "dev": true
-    },
     "signal-exit": {
       "version": "3.0.5",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.5.tgz",
@@ -1623,12 +2049,6 @@
         "strip-ansi": "^6.0.1"
       }
     },
-    "string_decoder": {
-      "version": "0.10.31",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-      "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
-      "dev": true
-    },
     "strip-ansi": {
       "version": "6.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
@@ -1644,12 +2064,6 @@
       "integrity": "sha512-3xurFv5tEgii33Zi8Jtp55wEIILR9eh34FAW00PZf+JnSsTmV/ioewSgQl97JHvgjoRGwPShsWm+IdrxB35d0w==",
       "dev": true
     },
-    "strip-json-comments": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
-      "integrity": "sha1-HhX7ysl9Pumb8tc7TGVrCCu6+5E=",
-      "dev": true
-    },
     "supports-color": {
       "version": "5.4.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.4.0.tgz",
@@ -1670,12 +2084,27 @@
         "minimatch": "^3.0.4"
       }
     },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
       "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
       "dev": true
     },
+    "type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "^1.2.1"
+      }
+    },
     "type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -1706,12 +2135,27 @@
         "is-typedarray": "^1.0.0"
       }
     },
+    "uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
     "uuid": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
       "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
       "dev": true
     },
+    "v8-compile-cache": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz",
+      "integrity": "sha512-l8lCEmLcLYZh4nbunNZvQCJc5pv7+RCwa8q/LdUx8u7lsWvPDKmpodJAJNwkAhJC//dFY48KuIEmjtd4RViDrA==",
+      "dev": true
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -1727,6 +2171,12 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
@@ -1788,6 +2238,12 @@
       "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
       "dev": true
     },
+    "yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "dev": true
+    },
     "yargs": {
       "version": "15.4.1",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
diff --git a/package.json b/package.json
index a03c2e5..b50b3ee 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "devDependencies": {
     "chai": "^4.3.4",
-    "jshint": "2.13.0",
+    "eslint": "^8.0.0",
     "mocha": "5.2.0",
     "nyc": "^15.1.0",
     "sinon": "7.5.0"
@@ -36,7 +36,7 @@
     "node": ">=4.0"
   },
   "scripts": {
-    "pretest": "jshint --config ./.jshintrc lib test",
+    "pretest": "./node_modules/.bin/eslint lib test index.js",
     "test": "NODE_ENV=test ./node_modules/.bin/mocha 'test/**/*_test.js'",
     "test-debug": "NODE_ENV=test ./node_modules/.bin/mocha  --inspect --debug-brk 'test/**/*_test.js'",
     "test:coverage": "NODE_ENV=test nyc --reporter=html --reporter=text ./node_modules/.bin/mocha 'test/**/*_test.js'"
diff --git a/test/integration/handlers/authorize-handler_test.js b/test/integration/handlers/authorize-handler_test.js
index ae0e41e..8b1aad9 100644
--- a/test/integration/handlers/authorize-handler_test.js
+++ b/test/integration/handlers/authorize-handler_test.js
@@ -1124,10 +1124,10 @@ describe('AuthorizeHandler integration', function() {
     describe('with `response_type` in the request body', function() {
       it('should return a response type', function() {
         var model = {
-        getAccessToken: function() {},
-        getClient: function() {},
-        saveAuthorizationCode: function() {}
-      };
+          getAccessToken: function() {},
+          getClient: function() {},
+          saveAuthorizationCode: function() {}
+        };
         var handler = new AuthorizeHandler({ authorizationCodeLifetime: 120, model: model });
         var request = new Request({ body: { response_type: 'code' }, headers: {}, method: {}, query: {} });
         var ResponseType = handler.getResponseType(request);
@@ -1139,10 +1139,10 @@ describe('AuthorizeHandler integration', function() {
     describe('with `response_type` in the request query', function() {
       it('should return a response type', function() {
         var model = {
-        getAccessToken: function() {},
-        getClient: function() {},
-        saveAuthorizationCode: function() {}
-      };
+          getAccessToken: function() {},
+          getClient: function() {},
+          saveAuthorizationCode: function() {}
+        };
         var handler = new AuthorizeHandler({ authorizationCodeLifetime: 120, model: model });
         var request = new Request({ body: {}, headers: {}, method: {}, query: { response_type: 'code' } });
         var ResponseType = handler.getResponseType(request);
diff --git a/test/integration/handlers/token-handler_test.js b/test/integration/handlers/token-handler_test.js
index 82574c9..97212a6 100644
--- a/test/integration/handlers/token-handler_test.js
+++ b/test/integration/handlers/token-handler_test.js
@@ -541,7 +541,7 @@ describe('TokenHandler integration', function() {
           requireClientAuthentication: {
             password: false
           }
-       });
+        });
         var request = new Request({ body: { client_id: 'blah', grant_type: 'password'}, headers: {}, method: {}, query: {} });
 
         return handler.getClient(request)
@@ -568,13 +568,13 @@ describe('TokenHandler integration', function() {
           requireClientAuthentication: {
             password: false
           }
-	});
+        });
         var request = new Request({
-	  body: { grant_type: 'password'},
-	  headers: { 'authorization': util.format('Basic %s', new Buffer('blah:').toString('base64')) },
-	  method: {},
-	  query: {}
-	});
+          body: { grant_type: 'password'},
+          headers: { 'authorization': util.format('Basic %s', new Buffer('blah:').toString('base64')) },
+          method: {},
+          query: {}
+        });
 
         return handler.getClient(request)
           .then(function(data) {
diff --git a/test/integration/server_test.js b/test/integration/server_test.js
index 8baaae0..1851e21 100644
--- a/test/integration/server_test.js
+++ b/test/integration/server_test.js
@@ -225,7 +225,7 @@ describe('Server integration', function() {
           return { accessToken: 1234, client: {}, user: {} };
         },
         validateScope: function() {
-            return 'foo';
+          return 'foo';
         }
       };
       var server = new Server({ model: model });
diff --git a/test/unit/models/token-model_test.js b/test/unit/models/token-model_test.js
index 9f2d41f..6fa0110 100644
--- a/test/unit/models/token-model_test.js
+++ b/test/unit/models/token-model_test.js
@@ -11,10 +11,10 @@ describe('Model', function() {
       atExpiresAt.setHours(new Date().getHours() + 1);
   
       var data = {
-          accessToken: 'foo',
-          client: 'bar',
-          user: 'tar',
-          accessTokenExpiresAt: atExpiresAt
+        accessToken: 'foo',
+        client: 'bar',
+        user: 'tar',
+        accessTokenExpiresAt: atExpiresAt
       };
   
       var model = new TokenModel(data);
diff --git a/test/unit/response_test.js b/test/unit/response_test.js
index 9d6b8a6..0ef54a8 100644
--- a/test/unit/response_test.js
+++ b/test/unit/response_test.js
@@ -107,14 +107,14 @@ describe('Request', function() {
     response.headers.newheader.should.eql('newvalue');
   });
 
- it('should process redirect', function() {
-   var originalResponse = generateBaseResponse();
-
-   var response = new Response(originalResponse);
-   response.headers.should.eql(originalResponse.headers);
-   response.status.should.eql(200);
-   response.redirect('http://foo.bar');
-   response.headers.location.should.eql('http://foo.bar');
-   response.status.should.eql(302);
- });
+  it('should process redirect', function() {
+    var originalResponse = generateBaseResponse();
+
+    var response = new Response(originalResponse);
+    response.headers.should.eql(originalResponse.headers);
+    response.status.should.eql(200);
+    response.redirect('http://foo.bar');
+    response.headers.location.should.eql('http://foo.bar');
+    response.status.should.eql(302);
+  });
 });
diff --git a/test/unit/validator/is_test.js b/test/unit/validator/is_test.js
new file mode 100644
index 0000000..c6827d8
--- /dev/null
+++ b/test/unit/validator/is_test.js
@@ -0,0 +1,127 @@
+var is = require('../../../lib/validator/is');
+require('chai').should();
+
+function runRanges (ranges, fn, expected) {
+  ranges.forEach(function (range) {
+    var lower = range[0];
+    var upper = range[1];
+
+    for (var i = lower; i <= upper; i++) {
+      var unicodeChar =  String.fromCodePoint(i);
+      // single char
+      fn(unicodeChar).should.eql(expected, i + ' ' + unicodeChar);
+      // multiple chars
+      fn(unicodeChar+unicodeChar).should.eql(expected, i + ' ' + unicodeChar);
+    }
+  });
+}
+
+describe('Validator', function () {
+  describe('is', function () {
+    it('validates if a value matches a unicode character (nchar)', function () {
+      var validRanges = [
+        [45, 46], // \u002D \u002E
+        [48, 57], // 0-9
+        [65, 90], // A-Z
+        [95, 95], // \u005F
+        [97, 122] // a-z
+      ];
+
+      runRanges(validRanges, is.nchar, true);
+
+      var invalidRanges = [
+        [0, 44],
+        [47, 47],
+        [58, 64],
+        [91, 94],
+        [96, 96],
+        [123, 1023]
+      ];
+
+      runRanges(invalidRanges, is.nchar, false);
+    });
+    it('validates if a value matches a unicode character, including exclamation marks (nqchar)', function () {
+      var validRanges = [
+        [33, 33], // \u0021
+        [35, 91], // \u0023-\u005B
+        [93, 126] // \u005D-\u007E
+      ];
+
+      runRanges(validRanges, is.nqchar, true);
+
+      var invalidRanges = [
+        [0, 32],
+        [34, 34],
+        [92, 92],
+        [127, 1023]
+      ];
+
+      runRanges(invalidRanges, is.nqchar, false);
+    });
+    it('validates if a value matches a unicode character, including exclamation marks and spaces (nqschar)', function () {
+      var validRanges = [
+        [32, 33], // \u0020-\u0021
+        [35, 91], // \u0023-\u005B
+        [93, 126] // \u005D-\u007E
+      ];
+
+      runRanges(validRanges, is.nqschar, true);
+
+      var invalidRanges = [
+        [0, 31],
+        [34, 34],
+        [92, 92],
+        [127, 1023]
+      ];
+
+      runRanges(invalidRanges, is.nqschar, false);
+    });
+    it('validates if a value matches a unicode character excluding the carriage return and linefeed characters (uchar)', function () {
+      this.timeout(60000);
+      var validRanges = [
+        [9, 9], // \u0009
+        [32, 126], // \u0020-\u007E,
+        [128, 55295], // \u0080-\uD7FF
+        [57344, 65533], // \uE000-\uFFFD
+        [65536, 1114111] // \u10000-\u10FFFF
+      ];
+
+      runRanges(validRanges, is.uchar, true);
+
+      var invalidRanges = [
+        [0, 8],
+        [10, 31],
+        [127, 127],
+        [55296, 57343],
+        [65534, 65535]
+      ];
+
+      runRanges(invalidRanges, is.uchar, false);
+    });
+    it('validates if a value matches generic URIs (uri)', function () {
+      ['aa:', 'http:', 'https:'].forEach(function (uri) {
+        is.uri(uri).should.equal(true);
+        is.uri(uri.toUpperCase()).should.equal(true);
+      });
+
+      ['a', 'a:', 'http'].forEach(function (uri) {
+        is.uri(uri).should.equal(false);
+        is.uri(uri.toUpperCase()).should.equal(false);
+      });
+    });
+    it('validates if a value matches against the printable set of unicode characters (vschar)', function () {
+      var validRanges = [
+        [32, 126] // \u0020-\u007E
+      ];
+
+      runRanges(validRanges, is.vschar, true);
+
+      var invalidRanges = [
+        [0, 31],
+        [127, 1023]
+      ];
+
+      runRanges(invalidRanges, is.vschar, false);
+    });
+  });
+});