Developer Tools

JWT Decoder

Decode JSON Web Tokens and inspect header and payload fields without sending them to a backend.

Use this tool

How to use JWT Decoder

Paste the full token with its dot-separated parts so the header and payload can be read together.
Review claims like issuer, audience, subject, and expiry to see whether the token matches the expected flow.
Use the decoded output for debugging only, then move to proper signature verification in your backend or auth layer.

Example workflow

When an API keeps returning unauthorized, a developer can decode the JWT, see that the `aud` claim points to the wrong service, and fix the token issuer configuration instead of guessing.

Privacy note

The decoder reads the token in your browser so you can inspect claims quickly without sending them to another service.

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Helpful guides

Best Way to Check a JWT Token

Understand how to inspect a JWT token safely, what the payload means, and what to watch for during debugging.

Read guide

JWT Decoder

Use this tool

How to use JWT Decoder

Example workflow

Related tools

JSON Formatter

Base64 Encode Decode

URL Encode Decode

Helpful guides

Best Way to Check a JWT Token

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