JWT Decoder
Paste a JWT token to decode its header, payload, and inspect claims. Everything happens locally — your token never leaves the browser.
What a JWT Contains
A JSON Web Token has three parts: a header with the algorithm, a payload with claims, and a signature. This decoder reads the first two parts and shows the JSON so you can inspect roles, expiration times, and custom fields without building a script.
How to Use It Safely
- Decode tokens from your own application or test environment
- Never share the token or its secret in public tickets
- Remember that decoding does not verify the signature
- Check the expiration claim before trusting a token
Does decoding verify the token?
No. This tool only shows the content; signature verification requires the correct secret or public key.