JWT Decoder for JavaScript
Free online jwt decoder with JavaScript code examples
Working with jwt decoder in JavaScript? Our free online jwt decoder helps JavaScript developers format, validate, and process data instantly. Below you will find JavaScript code examples using jsonwebtoken / jose so you can achieve the same result programmatically in your own projects.
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Open JWT DecoderJavaScript Code Example
const jwt = require('jsonwebtoken');
const token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c";
// Decode without verification
const decoded = jwt.decode(token, { complete: true });
console.log("Header:", JSON.stringify(decoded.header, null, 2));
console.log("Payload:", JSON.stringify(decoded.payload, null, 2));Quick Setup
Library: jsonwebtoken / jose
npm install jsonwebtokenJavaScript Tips & Best Practices
- jwt.decode() does NOT verify the signature
- Use jwt.verify(token, secret) for verified decoding
- The 'jose' package is a modern alternative with Web Crypto support