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.

Common mistakes people make

Treating a decoded token as verified when the tool only reveals the visible header and payload.
Reading the expiry value without converting the timestamp carefully into the correct time zone.
Ignoring audience and issuer claims and focusing only on the user ID or role fields.

When to use a different workflow

Use your backend verification flow when you need to prove the signature, key, or issuer is trusted.
Inspect auth middleware or identity-provider logs when the payload looks right but access still fails.
Use a full security review process for sensitive production tokens instead of relying on a browser decode alone.

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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

Why Decoding a JWT Is Not the Same as Verifying It

Learn the difference between reading a JWT payload and actually verifying a token before you trust it.

Read guide

JWT Decoder

Use this tool

How to use JWT Decoder

Example workflow

Common mistakes people make

When to use a different workflow

Related tools

JSON Formatter

Base64 Encode Decode

URL Encode Decode

Helpful guides

Best Way to Check a JWT Token

Why Decoding a JWT Is Not the Same as Verifying It

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