JWT Decoder & Generator: Inspect and Create JSON Web Tokens
Decode, inspect, verify, and generate JSON Web Tokens (JWT) with HS256/384/512 signing. View header and payload claims, check expiration, and create tokens for development — all client-side.
Key Features
- Decode JWT header and payload without sending to a server
- Verify HMAC signatures with your secret key
- Generate tokens with custom claims and expiration
- Syntax-highlighted JSON views for header and payload
- Copy encoded token or individual claim values
Common Use Cases
- Debug authentication issues in API integrations
- Inspect exp, iat, and custom claims in access tokens
- Generate test tokens for local development
- Verify token signatures during troubleshooting
- Learn JWT structure for OAuth and OpenID Connect
Benefits
- Secrets and tokens never leave your browser
- Instant decode without jwt.io or external APIs
- Supports common HMAC algorithms used in APIs
- Free with no rate limits
Decode and Verify JWTs
Paste any JSON Web Token to instantly view its header, payload, and signature. The decoder highlights standard claims like exp and iat with human-readable dates, detects expiration, and lets you verify HMAC signatures with your secret key.
All processing happens in your browser — tokens and secrets are never sent to a server.
Generate Signed Tokens
Use the Generator tab to create JWTs with HS256, HS384, or HS512. Toggle standard claims (sub, iss, aud, exp), add custom key-value pairs, and copy the token or an Authorization header in one click.
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