JWT Decoder
Decode a JWT token locally to inspect its header, payload, and common time-based claims.
JWT format is typically header.payload.signature. This tool decodes but does not verify the signature.
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Privacy: decoding runs locally in your browser. No token data is stored or transmitted.
How it works
Paste a JWT token, decode its base64url-encoded header and payload, and inspect the resulting JSON plus time-related claims such as exp, iat, and nbf.
Examples
- JWT tokens usually have 3 parts separated by dots
- The first two parts are base64url-encoded JSON
- The third part is the signature and is not decoded into JSON
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What does this JWT decoder do?
It decodes the header and payload parts of a JWT and shows them as JSON for inspection.
- Does this tool verify the signature?
No. This decoder only parses and displays the token structure. It does not verify authenticity.
- Can it show expiration timestamps?
Yes. Standard time-based claims such as exp, iat, and nbf are shown in both raw and readable form when present.
- Is my token sent anywhere?
No. Decoding runs locally in your browser and is not stored or transmitted.