How to encode and sign a JWT in Node.js

Step-by-step Node.js guide to encode and sign a JWT. Use the browser tool for quick testing, then integrate the snippet into your application.

Steps

1
Open the jwt encoder tool and generate or process your value in the browser.
2
Copy the output — nothing is sent to a server; all processing is client-side.
3
Store secrets in environment variables or a secrets manager, never in source code.
4
Integrate the Node.js snippet below into your application.
5
Test end-to-end before deploying to production.

Node.js

const jwt = require('jsonwebtoken');
const token = jwt.sign({ sub: 'user-1' }, secret, {
  algorithm: 'HS256',
  expiresIn: '1h',
});

Is it safe to use the browser tool for encode and sign a JWT?

Yes. All computation uses Web Crypto in your browser. No keys or tokens are transmitted to any server.

Can I use this Node.js code in production?

Yes, with proper secret storage. Replace placeholder values with environment variables and follow security best practices.