Best JWT Decoder for API Testing
Free online jwt decoder designed for api testing
JWT tokens are central to modern API authentication. Our decoder lets you instantly inspect the header and payload of any JWT, check expiration times, and verify claims — all without writing any code.
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Open JWT DecoderWhy It's the Best for API Testing
- Decode header and payload in one click
- Automatic expiration time validation
- Visual claim inspection with formatted JSON
- Supports all standard JWT algorithms
- No data sent to servers — decoding happens locally
Pro Tips for API Testing
- Check the 'exp' claim to verify token expiration
- Compare 'iss' and 'aud' claims against your API config
- Look for custom claims that may affect authorisation
- Never share production JWT tokens publicly