JWT Decoder
Decode JSON Web Tokens. View JWT header and payload without verification.
How to Use JWT Decoder
Paste your JWT token
Copy the JWT from your API response, browser storage, or authentication header and paste it into the decoder input field.
View decoded header
The header section is decoded instantly showing the signing algorithm (alg), token type (typ), and key ID (kid) if present.
Inspect payload claims
Review all payload claims including issuer, subject, audience, expiration, and any custom claims. Expired tokens are clearly flagged.
Copy decoded data
Use the copy buttons to grab the decoded header or payload JSON for debugging, documentation, or sharing with your development team.
About JWT Decoder
JWT decoder online — decode and inspect JSON Web Tokens to reveal header, payload, and signature components instantly. This free JWT parsing tool displays all token claims including issuer, audience, expiration time, and custom data with syntax-highlighted JSON. Essential for debugging OAuth flows, API authentication, SSO integrations, and understanding token contents. All decoding happens in your browser so your tokens stay private and secure.
Key Features
- Decode JWT tokens instantly to inspect header, payload, and signature
- View all token claims including issuer, audience, expiration, and custom data
- Validate token expiration and check if the JWT is still active
- Syntax-highlighted JSON output with collapsible sections for readability
- Detect common JWT issues like expired tokens and malformed Base64
- One-click copy of decoded header or payload JSON for debugging
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