JWT Generator & Decoder

Use this free online tool to quickly generate and decode JSON Web Tokens (JWT). JWTs are widely used to securely transmit information between parties as JSON objects, often for authentication and authorization in web applications.

Generate JWTs: Provide your payload in JSON format, choose an algorithm (HS256, RS256, ES256, etc.), and sign it with a secret or private key. You can also set an expiration time.
Decode JWTs: Paste an existing token to inspect its header and payload. You can choose to verify the signature with the correct secret/public key or simply decode without verification.

This tool helps developers test, debug, and understand how JWTs work in real-world scenarios. For more details, see the official specification: RFC 7519 – JSON Web Token (JWT)

Mode

Generate JWT

Decode / Verify JWT

Algorithm

Payload (JSON) or JWT string

If generating: provide a JSON object. If decoding: paste a JWT.

Secret (for HS* algorithms)

Private key (PEM)

Public key (PEM)

Expiration (minutes)

Decode without verification

Based on the firebase/php-jwt library.