2.1.2

This reverts commit 67f1a8e5ed.

.github/workflows/publish.yml

@@ -2,29 +2,29 @@ name: Publish
 
 on:
   release:
-    types: [created]
+    types: [published]
 
 jobs:
-  publish-npm:
+  publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v1
+      - uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 16
           registry-url: https://registry.npmjs.org/
-      - run: npm publish --access public
+      - name: Install dependencies
+        run: npm ci
+      - name: Build
+        run: npm run build
+      - name: Publish to npmjs
+        run: npm publish --tag latest --access public
         env:
           NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
-
+      - uses: actions/setup-node@v3
-  publish-gpr:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
         with:
-          node-version: 12
           registry-url: https://npm.pkg.github.com/
-      - run: npm publish --access public
+      - name: Publish to GPR
+        run: npm publish --tag latest --access public
         env:
           NODE_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}

.gitignore

@@ -142,3 +142,7 @@ dist
 .yarn/build-state.yml
 .yarn/install-state.gz
 .pnp.*
+
+# Custom
+/index.js
+/index.d.ts

.npmignore

@@ -0,0 +1,6 @@
+.github/
+src/
+test/
+.nvmrc
+index.test.js
+tsconfig.json

.nvmrc

@@ -0,0 +1 @@
+v16

README.md

@@ -8,6 +8,9 @@ A lightweight JWT implementation with ZERO dependencies for Cloudflare Workers.
 - [Install](#install)
 - [Examples](#examples)
 - [Usage](#usage)
+    - [Sign](#sign)
+    - [Verify](#verify)
+    - [Decode](#decode)
 
 
 ## Install
@@ -21,9 +24,9 @@ npm i -D @tsndr/cloudflare-worker-jwt
 
 ### Basic Example
 
-```javascript
+```typescript
 async () => {
-    const jwt = require('@tsndr/cloudflare-worker-jwt')
+    import jwt from '@tsndr/cloudflare-worker-jwt'
 
     // Creating a token
     const token = await jwt.sign({ name: 'John Doe', email: 'john.doe@gmail.com' }, 'secret')
@@ -42,9 +45,9 @@ async () => {
 
 ### Restrict Timeframe
 
-```javascript
+```typescript
 async () => {
-    const jwt = require('@tsndr/cloudflare-worker-jwt')
+    import jwt from '@tsndr/cloudflare-worker-jwt'
 
     // Creating a token
     const token = await jwt.sign({
@@ -81,11 +84,11 @@ Signs a payload and returns the token.
 
 #### Arguments
 
-Argument    | Type     | Satus    | Default | Description
+Argument    | Type     | Status   | Default | Description
 ----------- | -------- | -------- | ------- | -----------
 `payload`   | `object` | required | -       | The payload object. To use `nbf` (Not Before) and/or `exp` (Expiration Time) add `nbf` and/or `exp` to the payload.
 `secret`    | `string` | required | -       | A string which is used to sign the payload.
-`options`   | `object`, `string` | optional | `{ algorithm: 'HS256' }` | The options object supporting `algorithm` and `keyid` or just the algorithm string. (See [Available Algorithms](#available-algorithms))
+`options`   | `object` | optional | `{ algorithm: 'HS256' }` | The options object supporting `algorithm` and `keyid`. (See [Available Algorithms](#available-algorithms))
 
 #### `return`
 Returns token as a `string`.
@@ -97,11 +100,14 @@ Returns token as a `string`.
 
 Verifies the integrity of the token and returns a boolean value.
 
-Argument    | Type     | Satus    | Default | Description
+Argument    | Type     | Status   | Default | Description
 ----------- | -------- | -------- | ------- | -----------
 `token`     | `string` | required | -       | The token string generated by `jwt.sign()`.
 `secret`    | `string` | required | -       | The string which was used to sign the payload.
-`algorithm` | `object`, `string` | optional | `{ algorithm: 'HS256', throwError: false }` | The options object supporting `algorithm` or just the algorithm string. (See [Available Algorithms](#available-algorithms))
+`options`   | `object` | optional | `{ algorithm: 'HS256', throwError: false }` | The options object supporting `algorithm` and `throwError`. (See [Available Algorithms](#available-algorithms))
+
+#### `throws`
+If `options.throwError` is `true` and the token is invalid, an error will be thrown.
 
 #### `return`
 Returns `true` if signature, `nbf` (if set) and `exp` (if set) are valid, otherwise returns `false`. 
@@ -113,7 +119,7 @@ Returns `true` if signature, `nbf` (if set) and `exp` (if set) are valid, otherw
 
 Returns the payload **without** verifying the integrity of the token. Please use `jwt.verify()` first to keep your application secure!
 
-Argument    | Type     | Satus    | Default | Description
+Argument    | Type     | Status   | Default | Description
 ----------- | -------- | -------- | ------- | -----------
 `token`     | `string` | required | -       | The token string generated by `jwt.sign()`.
 

index.d.ts

@@ -1,60 +0,0 @@
-/**
- * JWT
- *
- * @class
- * @constructor
- * @public
- */
-declare class JWT {
-
-    /**
-     * Signs a payload and returns the token
-     * 
-     * @param {object} payload The payload object. To use `nbf` (Not Before) and/or `exp` (Expiration Time) add `nbf` and/or `exp` to the payload.
-     * @param {string} secret A string which is used to sign the payload.
-     * @param {JWTSignOptions | JWTAlgorithm} options The options object or the algorithm.
-     * @throws {Error} If there's a validation issue.
-     * @returns {Promise<string>} Returns token as a `string`.
-     */
-    sign(payload: object, secret: string, options?: JWTSignOptions | JWTAlgorithm): Promise<string>
-
-    /**
-     * Verifies the integrity of the token and returns a boolean value.
-     * 
-     * @param {string} token The token string generated by `jwt.sign()`.
-     * @param {string} secret The string which was used to sign the payload.
-     * @param {JWTVerifyOptions | JWTAlgorithm} options The options object or the algorithm.
-     * @throws {Error | string} Throws an error `string` if the token is invalid or an `Error-Object` if there's a validation issue.
-     * @returns {Promise<boolean>} Returns `true` if signature, `nbf` (if set) and `exp` (if set) are valid, otherwise returns `false`. 
-     */
-    verify(token: string, secret: string, options?: JWTVerifyOptions | JWTAlgorithm): Promise<boolean>
-
-    /**
-     * Returns the payload **without** verifying the integrity of the token. Please use `jwt.verify()` first to keep your application secure!
-     * 
-     * @param {string} token The token string generated by `jwt.sign()`.
-     * @returns {JWTDecodeReturn} Returns an `object` containing `header` and `payload`.
-     */
-    decode(token: string): JWTDecodeReturn
-}
-declare const _exports: JWT
-
-type JWTAlgorithm = 'ES256' | 'ES384' | 'ES512' | 'HS256' | 'HS384' | 'HS512' | 'RS256' | 'RS384' | 'RS512'
-
-type JWTSignOptions = {
-    algorithm?: JWTAlgorithm,
-    keyid?: string
-    header?: object
-}
-
-type JWTVerifyOptions = {
-    algorithm?: JWTAlgorithm
-    throwError?: boolean
-}
-
-type JWTDecodeReturn = {
-    header: object,
-    payload: object
-}
-
-export = _exports

index.js

@@ -1,126 +0,0 @@
-class Base64URL {
-    static parse(s) {
-        return new Uint8Array(Array.prototype.map.call(atob(s.replace(/-/g, '+').replace(/_/g, '/').replace(/\s/g, '')), c => c.charCodeAt(0)))
-    }
-    static stringify(a) {
-        return btoa(String.fromCharCode.apply(0, a)).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
-    }
-}
-
-class JWT {
-    constructor() {
-        if (typeof crypto === 'undefined' || !crypto.subtle)
-            throw new Error('Crypto not supported!')
-        this.algorithms = {
-            ES256: { name: 'ECDSA', namedCurve: 'P-256', hash: { name: 'SHA-256' } },
-            ES384: { name: 'ECDSA', namedCurve: 'P-384', hash: { name: 'SHA-384' } },
-            ES512: { name: 'ECDSA', namedCurve: 'P-521', hash: { name: 'SHA-512' } },
-            HS256: { name: 'HMAC', hash: { name: 'SHA-256' } },
-            HS384: { name: 'HMAC', hash: { name: 'SHA-384' } },
-            HS512: { name: 'HMAC', hash: { name: 'SHA-512' } },
-            RS256: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-256' } },
-            RS384: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-384' } },
-            RS512: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-512' } },
-        }
-    }
-    _utf8ToUint8Array(str) {
-        return Base64URL.parse(btoa(unescape(encodeURIComponent(str))))
-    }
-    _str2ab(str) {
-        const buf = new ArrayBuffer(str.length);
-        const bufView = new Uint8Array(buf);
-        for (let i = 0, strLen = str.length; i < strLen; i++) {
-            bufView[i] = str.charCodeAt(i);
-        }
-        return buf;
-    }
-    _decodePayload(raw) {
-        switch (raw.length % 4) {
-            case 0:
-                break
-            case 2:
-                raw += '=='
-                break
-            case 3:
-                raw += '='
-                break
-            default:
-                throw new Error('Illegal base64url string!')
-        }
-        try {
-            return JSON.parse(decodeURIComponent(escape(atob(raw))))
-        } catch {
-            return null
-        }
-    }
-    async sign(payload, secret, options = { algorithm: 'HS256', header: { typ: 'JWT' } }) {
-        if (typeof options === 'string')
-            options = { algorithm: options, header: { typ: 'JWT' } }
-        if (payload === null || typeof payload !== 'object')
-            throw new Error('payload must be an object')
-        if (typeof secret !== 'string')
-            throw new Error('secret must be a string')
-        if (typeof options.algorithm !== 'string')
-            throw new Error('options.algorithm must be a string')
-        const importAlgorithm = this.algorithms[options.algorithm]
-        if (!importAlgorithm)
-            throw new Error('algorithm not found')
-        payload.iat = Math.floor(Date.now() / 1000)
-        const payloadAsJSON = JSON.stringify(payload)
-        const partialToken = `${Base64URL.stringify(this._utf8ToUint8Array(JSON.stringify({ ...options.header, alg: options.algorithm, kid: options.keyid })))}.${Base64URL.stringify(this._utf8ToUint8Array(payloadAsJSON))}`
-        let keyFormat = 'raw'
-        let keyData
-        if (secret.startsWith('-----BEGIN')) {
-            keyFormat = 'pkcs8'
-            keyData = this._str2ab(atob(secret.replace(/-----BEGIN.*?-----/g, '').replace(/-----END.*?-----/g, '').replace(/\s/g, '')))
-        } else
-            keyData = this._utf8ToUint8Array(secret)
-        const key = await crypto.subtle.importKey(keyFormat, keyData, importAlgorithm, false, ['sign'])
-        const signature = await crypto.subtle.sign(importAlgorithm, key, this._utf8ToUint8Array(partialToken))
-        return `${partialToken}.${Base64URL.stringify(new Uint8Array(signature))}`
-    }
-    async verify(token, secret, options = { algorithm: 'HS256', throwError: false }) {
-        if (typeof options === 'string')
-            options = { algorithm: options }
-        if (typeof token !== 'string')
-            throw new Error('token must be a string')
-        if (typeof secret !== 'string')
-            throw new Error('secret must be a string')
-        if (typeof options.algorithm !== 'string')
-            throw new Error('options.algorithm must be a string')
-        const tokenParts = token.split('.')
-        if (tokenParts.length !== 3)
-            throw new Error('token must consist of 3 parts')
-        const importAlgorithm = this.algorithms[options.algorithm]
-        if (!importAlgorithm)
-            throw new Error('algorithm not found')
-        const payload = this.decode(token)
-        if (payload.nbf && payload.nbf > Math.floor(Date.now() / 1000)) {
-            if (options.throwError)
-                throw 'NOT_YET_VALID'
-            return false
-        }
-        if (payload.exp && payload.exp <= Math.floor(Date.now() / 1000)) {
-            if (options.throwError)
-                throw 'EXPIRED'
-            return false
-        }
-        let keyFormat = 'raw'
-        let keyData
-        if (secret.startsWith('-----BEGIN')) {
-            keyFormat = 'spki'
-            keyData = this._str2ab(atob(secret.replace(/-----BEGIN.*?-----/g, '').replace(/-----END.*?-----/g, '').replace(/\s/g, '')))
-        } else
-            keyData = this._utf8ToUint8Array(secret)
-        const key = await crypto.subtle.importKey(keyFormat, keyData, importAlgorithm, false, ['verify'])
-        return await crypto.subtle.verify(importAlgorithm, key, Base64URL.parse(tokenParts[2]), this._utf8ToUint8Array(`${tokenParts[0]}.${tokenParts[1]}`))
-    }
-    decode(token) {
-        return {
-            header: this._decodePayload(token.split('.')[0].replace(/-/g, '+').replace(/_/g, '/')),
-            payload: this._decodePayload(token.split('.')[1].replace(/-/g, '+').replace(/_/g, '/'))
-        }
-    }
-}
-
-module.exports = new JWT

index.test.js

@@ -3,17 +3,29 @@ Object.defineProperty(global, 'crypto', {
     value: { subtle }
 })
 
-const JWT = require('./index')
+const jwt = require('./index.js')
 const oneDay = (60 * 60 * 24)
 const now = Date.now() / 1000
+const algorithms = [
+    'ES256',
+    'ES384',
+    'ES512',
+    'HS256',
+    'HS384',
+    'HS512',
+    'RS256',
+    'RS384',
+    'RS512'
+]
 
 const secrets = {}
 
 // Keypairs
-for (const algorithm of Object.keys(JWT.algorithms)) {
+for (const algorithm of algorithms) {
-    if (algorithm.startsWith('HS'))
+    if (algorithm.startsWith('HS')) {
+        //secrets[algorithm] = 'c2VjcmV0'
         secrets[algorithm] = 'secret'
-    else if (algorithm.startsWith('RS')) {
+    } else if (algorithm.startsWith('RS')) {
         secrets[algorithm] = {
             public: `-----BEGIN PUBLIC KEY-----
 MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAu1SU1LfVLPHCozMxH2Mo
@@ -111,18 +123,19 @@ const testPayload = {
 test.each(Object.entries(secrets))(`Self test: %s`, async (algorithm, key) => {
     let privateKey = key
     let publicKey = key
+
     if (typeof key === 'object') {
         privateKey = key.private
         publicKey = key.public
     }
 
-    const token = await JWT.sign(testPayload, privateKey, { algorithm })
+    const token = await jwt.sign(testPayload, privateKey, { algorithm })
     expect(token).toMatch(/^[a-zA-Z0-9\-_]+\.[a-zA-Z0-9\-_]+\.[a-zA-Z0-9\-_]+$/)
 
-    const verified = await JWT.verify(token, publicKey, { algorithm })
+    const verified = await jwt.verify(token, publicKey, { algorithm })
     expect(verified).toBeTruthy()
 
-    const { payload } = JWT.decode(token)
+    const { payload } = jwt.decode(token)
     expect({
         sub: payload.sub,
         name: payload.name
@@ -147,17 +160,16 @@ const externalTokens = {
 
 test.each(Object.entries(externalTokens))('Verify external tokens: %s', async (algorithm, token) => {
     const key = secrets[algorithm]
-    let privateKey = key
-    let publicKey = key
-    if (typeof key === 'object') {
-        privateKey = key.private
-        publicKey = key.public
-    }
 
-    const verified = await JWT.verify(token, publicKey, { algorithm })
+    let publicKey = key
+
+    if (typeof key === 'object')
+        publicKey = key.public
+
+    const verified = await jwt.verify(token, publicKey, { algorithm })
     expect(verified).toBeTruthy()
 
-    const { payload } = JWT.decode(token)
+    const { payload } = jwt.decode(token)
     expect({
         sub: payload.sub,
         name: payload.name

package.json

@@ -1,10 +1,12 @@
 {
   "name": "@tsndr/cloudflare-worker-jwt",
-  "version": "1.4.0",
+  "version": "2.1.2",
   "description": "A lightweight JWT implementation with ZERO dependencies for Cloudflare Worker",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
-      "test": "jest"
+    "build": "tsc",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -24,6 +26,8 @@
   },
   "homepage": "https://github.com/tsndr/cloudflare-worker-jwt#readme",
   "devDependencies": {
-    "jest": "^28.1.0"
+    "@cloudflare/workers-types": "^3.13.0",
+    "jest": "^28.1.1",
+    "typescript": "^4.7.4"
   }
 }

src/index.ts

@@ -0,0 +1,300 @@
+if (typeof crypto === 'undefined' || !crypto.subtle)
+    throw new Error('SubtleCrypto not supported!')
+
+/**
+ * @typedef JwtAlgorithm
+ * @type {'ES256'|'ES384'|'ES512'|'HS256'|'HS384'|'HS512'|'RS256'|'RS384'|'RS512'}
+ */
+export type JwtAlgorithm = 'ES256'|'ES384'|'ES512'|'HS256'|'HS384'|'HS512'|'RS256'|'RS384'|'RS512'
+
+/**
+ * @typedef JwtAlgorithms
+ */
+export interface JwtAlgorithms {
+    [key: string]: SubtleCryptoImportKeyAlgorithm
+}
+
+/**
+ * @typedef JwtHeader
+ * @prop {string} [typ] Type
+ */
+export interface JwtHeader {
+    /**
+     * Type (default: `"JWT"`)
+     * 
+     * @default "JWT"
+     */
+    typ?: string
+
+    [key: string]: any
+}
+
+/**
+ * @typedef JwtPayload
+ * @prop {string} [iss] Issuer
+ * @prop {string} [sub] Subject
+ * @prop {string} [aud] Audience
+ * @prop {string} [exp] Expiration Time
+ * @prop {string} [nbf] Not Before
+ * @prop {string} [iat] Issued At
+ * @prop {string} [jti] JWT ID
+ */
+export interface JwtPayload {
+    /** Issuer */
+    iss?: string
+
+    /** Subject */
+    sub?: string
+
+    /** Audience */
+    aud?: string
+
+    /** Expiration Time */
+    exp?: number
+
+    /** Not Before */
+    nbf?: number
+
+    /** Issued At */
+    iat?: number
+
+    /** JWT ID */
+    jti?: string
+
+    [key: string]: any
+}
+
+/**
+ * @typedef JwtOptions
+ * @prop {JwtAlgorithm | string} algorithm
+ */
+export interface JwtOptions {
+    algorithm?: JwtAlgorithm | string
+}
+
+/**
+ * @typedef JwtSignOptions
+ * @extends JwtOptions
+ * @prop {JwtHeader} [header]
+ */
+export interface JwtSignOptions extends JwtOptions {
+    header?: JwtHeader
+}
+
+/**
+ * @typedef JwtVerifyOptions
+ * @extends JwtOptions
+ * @prop {boolean} [throwError=false] If `true` throw error if checks fail. (default: `false`)
+ */
+export interface JwtVerifyOptions extends JwtOptions {
+    /**
+     * If `true` throw error if checks fail. (default: `false`)
+     * 
+     * @default false
+    */
+    throwError?: boolean
+}
+
+/**
+ * @typedef JwtData
+ * @prop {JwtHeader} header
+ * @prop {JwtPayload} payload
+ */
+export interface JwtData {
+    header: JwtHeader
+    payload: JwtPayload
+}
+
+function base64UrlParse(s: string): Uint8Array {
+    // @ts-ignore
+    return new Uint8Array(Array.prototype.map.call(atob(s.replace(/-/g, '+').replace(/_/g, '/').replace(/\s/g, '')), c => c.charCodeAt(0)))
+    // return new Uint8Array(Array.from(atob(s.replace(/-/g, '+').replace(/_/g, '/').replace(/\s/g, ''))).map(c => c.charCodeAt(0)))
+}
+
+function base64UrlStringify(a: Uint8Array): string {
+    // @ts-ignore
+    return btoa(String.fromCharCode.apply(0, a)).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
+    // return btoa(String.fromCharCode.apply(0, Array.from(a))).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
+}
+
+const algorithms: JwtAlgorithms = {
+    ES256: { name: 'ECDSA', namedCurve: 'P-256', hash: { name: 'SHA-256' } },
+    ES384: { name: 'ECDSA', namedCurve: 'P-384', hash: { name: 'SHA-384' } },
+    ES512: { name: 'ECDSA', namedCurve: 'P-521', hash: { name: 'SHA-512' } },
+    HS256: { name: 'HMAC', hash: { name: 'SHA-256' } },
+    HS384: { name: 'HMAC', hash: { name: 'SHA-384' } },
+    HS512: { name: 'HMAC', hash: { name: 'SHA-512' } },
+    RS256: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-256' } },
+    RS384: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-384' } },
+    RS512: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-512' } }
+}
+
+function _utf8ToUint8Array(str: string): Uint8Array {
+    return base64UrlParse(btoa(unescape(encodeURIComponent(str))))
+}
+
+function _str2ab(str: string): ArrayBuffer {
+    str = atob(str)
+
+    const buf = new ArrayBuffer(str.length);
+    const bufView = new Uint8Array(buf);
+
+    for (let i = 0, strLen = str.length; i < strLen; i++) {
+        bufView[i] = str.charCodeAt(i);
+    }
+
+    return buf;
+}
+
+function _decodePayload(raw: string): JwtHeader | JwtPayload | null {
+    switch (raw.length % 4) {
+        case 0:
+            break
+        case 2:
+            raw += '=='
+            break
+        case 3:
+            raw += '='
+            break
+        default:
+            throw new Error('Illegal base64url string!')
+    }
+
+    try {
+        return JSON.parse(decodeURIComponent(escape(atob(raw))))
+    } catch {
+        return null
+    }
+}
+
+/**
+ * Signs a payload and returns the token
+ * 
+ * @param {JwtPayload} payload The payload object. To use `nbf` (Not Before) and/or `exp` (Expiration Time) add `nbf` and/or `exp` to the payload.
+ * @param {string} secret A string which is used to sign the payload.
+ * @param {JwtSignOptions | JwtAlgorithm | string} [options={ algorithm: 'HS256', header: { typ: 'JWT' } }] The options object or the algorithm.
+ * @throws {Error} If there's a validation issue.
+ * @returns {Promise<string>} Returns token as a `string`.
+ */
+export async function sign(payload: JwtPayload, secret: string, options: JwtSignOptions | JwtAlgorithm = { algorithm: 'HS256', header: { typ: 'JWT' } }): Promise<string> {
+    if (typeof options === 'string')
+        options = { algorithm: options, header: { typ: 'JWT' } }
+
+    options = { algorithm: 'HS256', header: { typ: 'JWT' }, ...options }
+
+    if (payload === null || typeof payload !== 'object')
+        throw new Error('payload must be an object')
+
+    if (typeof secret !== 'string')
+        throw new Error('secret must be a string')
+
+    if (typeof options.algorithm !== 'string')
+        throw new Error('options.algorithm must be a string')
+
+    const algorithm: SubtleCryptoImportKeyAlgorithm = algorithms[options.algorithm]
+
+    if (!algorithm)
+        throw new Error('algorithm not found')
+
+    payload.iat = Math.floor(Date.now() / 1000)
+
+    const payloadAsJSON = JSON.stringify(payload)
+    const partialToken = `${base64UrlStringify(_utf8ToUint8Array(JSON.stringify({ ...options.header, alg: options.algorithm })))}.${base64UrlStringify(_utf8ToUint8Array(payloadAsJSON))}`
+    let keyFormat = 'raw'
+    let keyData
+    if (secret.startsWith('-----BEGIN')) {
+        keyFormat = 'pkcs8'
+        keyData = _str2ab(secret.replace(/-----BEGIN.*?-----/g, '').replace(/-----END.*?-----/g, '').replace(/\s/g, ''))
+    } else
+        keyData = _utf8ToUint8Array(secret)
+    const key = await crypto.subtle.importKey(keyFormat, keyData, algorithm, false, ['sign'])
+    const signature = await crypto.subtle.sign(algorithm, key, _utf8ToUint8Array(partialToken))
+
+    return `${partialToken}.${base64UrlStringify(new Uint8Array(signature))}`
+}
+
+/**
+ * Verifies the integrity of the token and returns a boolean value.
+ * 
+ * @param {string} token The token string generated by `jwt.sign()`.
+ * @param {string} secret The string which was used to sign the payload.
+ * @param {JWTVerifyOptions | JWTAlgorithm} options The options object or the algorithm.
+ * @throws {Error | string} Throws an error `string` if the token is invalid or an `Error-Object` if there's a validation issue.
+ * @returns {Promise<boolean>} Returns `true` if signature, `nbf` (if set) and `exp` (if set) are valid, otherwise returns `false`. 
+ */
+export async function verify(token: string, secret: string, options: JwtVerifyOptions | JwtAlgorithm = { algorithm: 'HS256', throwError: false }): Promise<boolean> {
+    if (typeof options === 'string')
+        options = { algorithm: options, throwError: false }
+
+    options = { algorithm: 'HS256', throwError: false, ...options }
+
+    if (typeof token !== 'string')
+        throw new Error('token must be a string')
+
+    if (typeof secret !== 'string')
+        throw new Error('secret must be a string')
+
+    if (typeof options.algorithm !== 'string')
+        throw new Error('options.algorithm must be a string')
+
+    const tokenParts = token.split('.')
+
+    if (tokenParts.length !== 3)
+        throw new Error('token must consist of 3 parts')
+
+    const algorithm: SubtleCryptoImportKeyAlgorithm = algorithms[options.algorithm]
+
+    if (!algorithm)
+        throw new Error('algorithm not found')
+
+    const { payload } = decode(token)
+
+    if (!payload) {
+        if (options.throwError)
+            throw 'PARSE_ERROR'
+
+        return false
+    }
+
+    if (payload.nbf && payload.nbf > Math.floor(Date.now() / 1000)) {
+        if (options.throwError)
+            throw 'NOT_YET_VALID'
+
+        return false
+    }
+
+    if (payload.exp && payload.exp <= Math.floor(Date.now() / 1000)) {
+        if (options.throwError)
+            throw 'EXPIRED'
+
+        return false
+    }
+    let keyFormat = 'raw'
+    let keyData
+    if (secret.startsWith('-----BEGIN')) {
+        keyFormat = 'spki'
+        keyData = _str2ab(secret.replace(/-----BEGIN.*?-----/g, '').replace(/-----END.*?-----/g, '').replace(/\s/g, ''))
+    } else
+        keyData = _utf8ToUint8Array(secret)
+    const key = await crypto.subtle.importKey(keyFormat, keyData, algorithm, false, ['verify'])
+    return await crypto.subtle.verify(algorithm, key, base64UrlParse(tokenParts[2]), _utf8ToUint8Array(`${tokenParts[0]}.${tokenParts[1]}`))
+}
+
+/**
+ * Returns the payload **without** verifying the integrity of the token. Please use `jwt.verify()` first to keep your application secure!
+ * 
+ * @param {string} token The token string generated by `jwt.sign()`.
+ * @returns {JwtData} Returns an `object` containing `header` and `payload`.
+ */
+export function decode(token: string): JwtData {
+    return {
+        header: _decodePayload(token.split('.')[0].replace(/-/g, '+').replace(/_/g, '/')) as JwtHeader,
+        payload: _decodePayload(token.split('.')[1].replace(/-/g, '+').replace(/_/g, '/')) as JwtPayload
+    }
+}
+
+export default {
+    sign,
+    verify,
+    decode
+}

tsconfig.json

@@ -0,0 +1,27 @@
+{
+    "compilerOptions": {
+        "outDir": ".",
+        "module": "commonjs",
+        "target": "esnext",
+        "lib": ["esnext"],
+        "declaration": true,
+        "strict": true,
+        "noImplicitAny": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "strictBindCallApply": true,
+        "strictPropertyInitialization": true,
+        "noImplicitThis": true,
+        "alwaysStrict": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
+        "noImplicitReturns": true,
+        "noFallthroughCasesInSwitch": true,
+        "esModuleInterop": true,
+        "preserveConstEnums": true,
+        "moduleResolution": "node",
+        "types": ["@cloudflare/workers-types"]
+    },
+    "include": ["src"],
+    "exclude": ["node_modules"]
+}