diff --git a/.gitignore b/.gitignore
index 1606d7b..1f6c9b8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,5 +19,4 @@ npm-debug.log
 node_modules
 build/*
 !build/jwt-decode.js
-coverage/*
-dist/*
\ No newline at end of file
+coverage/*
\ No newline at end of file
diff --git a/README.md b/README.md
index e0720ea..b10c74b 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ const jwt_decode = require('jwt-decode');
 
 #### Include with a script tag
 
-Copy the file `jwt-decode.js` from the `dist/` folder to your project somewhere, then include it like so:
+Copy the file `jwt-decode.js` from the `build/` folder to your project somewhere, then include it like so:
 
 ```html
 <script src="jwt-decode.js"></script>
diff --git a/build/jwt-decode.js b/build/jwt-decode.js
new file mode 100644
index 0000000..261e2b8
--- /dev/null
+++ b/build/jwt-decode.js
@@ -0,0 +1,82 @@
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+    typeof define === 'function' && define.amd ? define(factory) :
+    (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.jwt_decode = factory());
+})(this, (function () { 'use strict';
+
+    const global = (typeof globalThis !== "undefined" && globalThis) || window;
+    var atob = global.atob.bind(global);
+
+    function b64DecodeUnicode(str) {
+        return decodeURIComponent(atob(str).replace(/(.)/g, function (m, p) {
+            var code = p.charCodeAt(0).toString(16).toUpperCase();
+            if (code.length < 2) {
+                code = "0" + code;
+            }
+            return "%" + code;
+        }));
+    }
+    function base64_url_decode (str) {
+        var output = str.replace(/-/g, "+").replace(/_/g, "/");
+        switch (output.length % 4) {
+            case 0:
+                break;
+            case 2:
+                output += "==";
+                break;
+            case 3:
+                output += "=";
+                break;
+            default:
+                throw new Error("base64 string is not of the correct length");
+        }
+        try {
+            return b64DecodeUnicode(output);
+        }
+        catch (err) {
+            return atob(output);
+        }
+    }
+
+    class InvalidTokenError extends Error {
+        constructor(message) {
+            super(message);
+        }
+    }
+    InvalidTokenError.prototype.name = "InvalidTokenError";
+    function jwtDecode(token, options = { header: false }) {
+        if (typeof token !== "string") {
+            throw new InvalidTokenError("Invalid token specified: must be a string");
+        }
+        options = options || {};
+        var pos = options.header === true ? 0 : 1;
+        var part = token.split(".")[pos];
+        if (typeof part !== "string") {
+            throw new InvalidTokenError("Invalid token specified: missing part #" + (pos + 1));
+        }
+        try {
+            var decoded = base64_url_decode(part);
+        }
+        catch (e) {
+            throw new InvalidTokenError("Invalid token specified: invalid base64 for part #" +
+                (pos + 1) +
+                " (" +
+                e.message +
+                ")");
+        }
+        try {
+            return JSON.parse(decoded);
+        }
+        catch (e) {
+            throw new InvalidTokenError("Invalid token specified: invalid json for part #" +
+                (pos + 1) +
+                " (" +
+                e.message +
+                ")");
+        }
+    }
+
+    return jwtDecode;
+
+}));
+//# sourceMappingURL=jwt-decode.js.map
diff --git a/package.json b/package.json
index a96461f..fb8a211 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,9 @@
     "name": "jwt-decode",
     "version": "3.1.2",
     "description": "Decode JWT tokens, mostly useful for browser applications.",
-    "main": "dist/cjs/jwt-decode.js",
-    "module": "dist/esm/jwt-decode.js",
-    "types": "dist/typings/index.d.ts",
+    "main": "build/cjs/jwt-decode.js",
+    "module": "build/esm/jwt-decode.js",
+    "types": "build/typings/index.d.ts",
     "keywords": [
         "jwt",
         "browser"
@@ -17,8 +17,8 @@
     "homepage": "https://github.com/auth0/jwt-decode#readme",
     "scripts": {
         "dev": "rollup -m -c",
-        "build": "rimraf dist && rollup -m -c --environment NODE_ENV:production",
-        "postbuild": "echo '{\"type\": \"commonjs\"}'> dist/cjs/package.json",
+        "build": "rimraf build && rollup -m -c --environment NODE_ENV:production",
+        "postbuild": "echo '{\"type\": \"commonjs\"}'> build/cjs/package.json",
         "test": "npm run test:node && npm run test:browser",
         "test:node": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --coverage",
         "test:browser": "NODE_OPTIONS='--experimental-vm-modules --no-warnings' jest --coverage --testEnvironment=jsdom"
@@ -50,7 +50,7 @@
         "uglify-js": "^3.15.2"
     },
     "files": [
-        "dist/",
+        "build/",
         "index.d.ts"
     ],
     "engines": {
@@ -59,9 +59,9 @@
     "type": "module",
     "exports": {
         ".": {
-            "require": "./dist/cjs/jwt-decode.js",
-            "import": "./dist/esm/jwt-decode.js",
-            "types": "./dist/typings/index.d.ts"
+            "require": "./build/cjs/jwt-decode.js",
+            "import": "./build/esm/jwt-decode.js",
+            "types": "./build/typings/index.d.ts"
         }
     }
 }
diff --git a/rollup.config.js b/rollup.config.js
index 57a50cc..9c5ec6f 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -34,7 +34,7 @@ export default [{
         input: "lib/index.standalone.ts",
         output: {
             name: "jwt_decode",
-            file: "dist/jwt-decode.js",
+            file: "build/jwt-decode.js",
             format: "umd",
         },
         plugins: [
@@ -55,7 +55,7 @@ export default [{
         input: "lib/index.cjs.ts",
         output: [{
             name: EXPORT_NAME,
-            file: "dist/cjs/jwt-decode.js",
+            file: "build/cjs/jwt-decode.js",
             format: "cjs",
             exports: "auto",
         }, ],
@@ -65,12 +65,12 @@ export default [{
         input: "lib/index.ts",
         output: [{
             name: EXPORT_NAME,
-            file: "dist/esm/jwt-decode.js",
+            file: "build/esm/jwt-decode.js",
             format: "esm",
         }, ],
         plugins: [!isProduction &&
             serve({
-                contentBase: ["dist", "static"],
+                contentBase: ["build", "static"],
                 open: true,
                 port: 3000,
             }), !isProduction && livereload(),
diff --git a/tsconfig.json b/tsconfig.json
index c136997..ffe5ca1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,7 +5,7 @@
       "esModuleInterop": true,
       "sourceMap": true,
       "declaration": true,
-      "declarationDir": "./dist/typings",
+      "declarationDir": "./build/typings",
       "moduleResolution": "node",
       "noImplicitAny": true,
       "downlevelIteration": true,
@@ -16,6 +16,6 @@
       "strictFunctionTypes": true,
       "strictPropertyInitialization": true,
     },
-    "exclude": ["./test", "./dist/typings"]
+    "exclude": ["./test", "./build/typings"]
   }
   
\ No newline at end of file