JWT Decoder
Decode JWT tokens online without sending them to a server. Inspect header algorithm, standard claims (iss, sub, aud, exp), and payload JSON — signature verification is not performed.
Warning: This tool only decodes JWTs. It does not verify the signature.
Your generated secrets and hashes are processed locally in your browser whenever possible and are not stored on our servers.
Overview
Decode JWT tokens online without sending them to a server. Inspect header algorithm, standard claims (iss, sub, aud, exp), and payload JSON — signature verification is not performed.
Benefits
- Full header + payload decode
- Expiration summary
- Standard claim highlights
- 100% local decode
Use Cases
- Debug OAuth access tokens
- Inspect API gateway tokens
- Support ticket troubleshooting
- Learn JWT structure
Users Also Use
How to Use
- Paste JWT (three Base64URL segments).
- Click Decode JWT.
- Review decoded JSON and expiry.
FAQ
- What is a JWT?
- A JSON Web Token encodes claims as Base64URL JSON, signed or encrypted for authentication and authorization.
- Does this verify the signature?
- No. This tool only decodes JWTs for inspection. Never trust decoded content without verification in your app.
- Is my JWT sent to your server?
- Never. Decoding happens in your browser.
About JWT Decoder
A jwt decoder online is essential for modern auth debugging. See alg, typ, exp, and custom claims instantly. Pair with our JWT expiration checker for quick validity tests.