Enter JWT Token

Header (Decoded)

// Header will appear here

Payload (Decoded)

// Payload will appear here

Free Online JWT Decoder — Inspect JSON Web Tokens Securely

Working with modern web authentication? Our JWT Decoder is an essential developer tool for inspecting JSON Web Tokens. Whether you are debugging OAuth flows, inspecting user claims, or verifying token expiration times, this tool instantly parses the Base64Url encoded segments of your JWT and displays the header and payload in a beautifully formatted JSON structure.

100% Client-Side Security: JWTs often contain sensitive user information and session identifiers. Pasting these tokens into random online tools poses a massive security risk. Our decoder eliminates this risk entirely. It relies strictly on client-side JavaScript to parse the token. Your token is never logged, stored, or transmitted to any external server.

Detailed Inspection: The tool breaks down the three parts of a standard JWT: the header (algorithm & token type), the payload (data & claims), and the signature. It automatically translates Unix timestamps found in standard claims like 'exp' (expiration) and 'iat' (issued at) into human-readable local times, drastically speeding up your debugging process.

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Frequently Asked Questions

What information does a JSON Web Token (JWT) contain? +
A JWT consists of three parts separated by dots: a Header (algorithm type), a Payload (the actual data claims, like user IDs and expiration dates), and a Signature (used to verify the token hasn't been tampered with).
Can I use this tool to verify the JWT signature? +
Currently, the tool operates as a decoder. It safely decodes the Base64Url encoded Header and Payload so you can read the contents, but it does not validate the cryptographic signature against a secret key.
Is it safe to paste my production JWTs here? +
Yes, it is entirely safe. The decoding process runs purely in your local browser using JavaScript. The token is never logged, saved, or transmitted to any server.