DevToolsHub
All Tools

JWT Decoder

Decode and inspect JWT tokens — view header, payload and signature

— Ad Space —

JWT is decoded client-side. No data is sent to any server.

About This Tool

JSON Web Tokens (JWT) are widely used for authentication and information exchange in modern web applications. This free online JWT decoder lets you inspect the contents of any JWT token — header, payload, and signature — without sending your token to any server.

Use this tool to debug authentication flows during development, verify JWT claims like issuer (iss), subject (sub), and expiration (exp), check if a token has expired, and understand the structure of JWT tokens for learning or troubleshooting.

The decoder automatically parses all three parts of the JWT, detects when the token has expired (with visual indicators), and includes a sample token so you can try the tool immediately. All decoding is done client-side — your tokens never leave your browser.

Frequently Asked Questions

Can I verify the JWT signature?
This tool decodes and displays the header and payload. Signature verification requires the signing secret, which this tool does not have for security reasons.
Is it safe to paste my production JWT tokens?
Yes. All decoding is done client-side — your token never leaves your browser. No server requests are made.
What does 'exp' mean?
exp (expiration time) is a standard JWT claim. The tool automatically checks if the token has expired and shows a visual indicator (green for valid, red for expired).

You Might Also Need

Base64 Encode / DecodeUse Now →JSON FormatterUse Now →Timestamp ConverterUse Now →
— Ad Space —