What is JWT Decoder?
JSON Web Tokens often contain three dot-separated segments: header, payload and signature. Decoding exposes readable JSON but does not prove that the token is authentic, valid, or trusted.
How to use this tool
- Paste a compact JWT token into the input.
- Click Decode to inspect its header and payload.
- Verify signatures and claims separately on a trusted backend before granting access.
Example
header.payload.signature (Base64URL encoded)