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JWT Generator

Online JWT Generator Tool

Generate JSON Web Tokens (JWT) instantly with our free online tool. Securely create token headers, payloads, and signatures directly in your browser.

Signing Algorithm
Include Expiration Claim

JWT Generator Guide

Everything you need to know about creating and using JWTs

🔑 What is a JWT?

A JWT (JSON Web Token) is like a secure digital pass that contains information. It has 3 parts:

Header

Contains type & algorithm

{ "alg": "HS256", "typ": "JWT" }

Payload

Stores your data

{ "user": "john", "role": "admin" }

Signature

Verifies authenticity

HMACSHA256( header + payload, secret )

✍️ Signing Methods

HMAC (Symmetric)

HS256Recommended for most apps
HS384Enhanced security
HS512Maximum security

RSA (Asymmetric)

RS256Standard RSA with SHA-256
RS384Enhanced RSA with SHA-384
RS512Maximum security RSA with SHA-512

🛡️ Security Tips

Do's

  • ✓ Use strong, unique keys
  • ✓ Set short expiration times
  • ✓ Validate tokens properly
  • ✓ Store keys securely

Don'ts

  • ✕ Store sensitive data in payload
  • ✕ Share private keys
  • ✕ Use weak secrets
  • ✕ Skip token validation

📝 Common Examples

Authentication Token

{ "sub": "user123", "name": "John Doe", "role": "admin", "exp": 1516239022 }

API Usage

// Request header Authorization: Bearer eyJhbGciOiJIUzI1NiIs... // Verification const verified = jwt.verify(token, secretKey);