JWT Decoder
Decode JSON Web Tokens to inspect header and payload claims. Shows expiration status.
How to Use JWT Decoder
The JWT Decoder is a free online tool that decodes JSON Web Tokens to reveal their header and payload contents. Paste any JWT token and instantly see the decoded header (algorithm, type) and payload (claims like sub, iat, exp) formatted as readable JSON. The tool also checks the expiration claim and shows whether the token is still valid or has expired. Essential for developers debugging authentication flows, inspecting API tokens, verifying OAuth responses, or understanding token contents during development. All decoding happens in your browser — your tokens are never sent to any server, keeping your credentials safe.
Step-by-Step Instructions
- Paste your JWT token into the input area
- Click decode to parse the token
- View the decoded header and payload as formatted JSON
- Check the expiration status indicator
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