JWT Decoder Online
Use this free online JWT Decoder tool to decode and inspect JSON Web Tokens instantly. View header, payload, and expiry status — your token never leaves the browser.
How it works & FAQ
Why this is secure?
JWT decoding happens entirely in your browser. Your token is never sent to any server or third party. This is a read-only decoder — it does not verify signatures.
Step-by-Step Guide
- 1Paste your JWT (JSON Web Token) into the input field.
- 2The header, payload, and signature sections are decoded and displayed immediately.
- 3Check the 'exp' field to see when the token expires, shown in human-readable format.
Frequently Asked Questions (FAQ)
Is it safe to paste my JWT here?
Yes. Decoding runs entirely in your browser — your token is never transmitted anywhere. As a best practice, avoid pasting production tokens on any public tool.
Does this verify the JWT signature?
No. This is a decoder only — it shows the token's contents but does not validate the cryptographic signature. For signature verification, use your backend or a server-side JWT library.
What information is in a JWT?
A JWT has three parts: the header (algorithm and token type), the payload (claims like user ID, roles, and expiry time), and the signature (for tamper detection).
Your JWT is decoded entirely in browser memory. No token data is transmitted.