Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/node_modules/jwt-decode/lib/index.js

@@ -0,0 +1,26 @@
+'use strict';
+
+var base64_url_decode = require('./base64_url_decode');
+
+function InvalidTokenError(message) {
+  this.message = message;
+}
+
+InvalidTokenError.prototype = new Error();
+InvalidTokenError.prototype.name = 'InvalidTokenError';
+
+module.exports = function (token,options) {
+  if (typeof token !== 'string') {
+    throw new InvalidTokenError('Invalid token specified');
+  }
+
+  options = options || {};
+  var pos = options.header === true ? 0 : 1;
+  try {
+    return JSON.parse(base64_url_decode(token.split('.')[pos]));
+  } catch (e) {
+    throw new InvalidTokenError('Invalid token specified: ' + e.message);
+  }
+};
+
+module.exports.InvalidTokenError = InvalidTokenError;