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JWT Decoder

Decode and inspect JWT tokens instantly. View header, payload, and signature.

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Security notice: This tool does not verify JWT signatures. Never share tokens containing sensitive data.

How to Use the JWT Decoder

  1. Paste your JWT token into the text area above.
  2. The token is decoded automatically on paste, or click Decode JWT.
  3. View the Header, Payload, and Signature in separate panels.
  4. Check the expiration status if an exp claim is present.
  5. Use the Copy button on each panel to copy the decoded content.

Use Cases

  • Debugging authentication issues in web applications
  • Inspecting claims and permissions in access tokens
  • Verifying token expiration during development
  • Understanding JWT structure for learning purposes

Key Features

  • Auto-decode on paste — no button click needed
  • Human-readable dates for iat, exp, and nbf claims
  • Expiration status indicator (Valid / Expired)
  • Copy button for each panel
  • 100% client-side — no data sent to any server

Frequently Asked Questions

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used to represent claims between two parties. It consists of three base64url-encoded parts: header, payload, and signature, separated by dots.

Is my token sent to your servers?

No. All decoding happens entirely in your browser using JavaScript. Your token never leaves your device.

Does this tool verify the JWT signature?

No. Signature verification requires the secret key or public key used to sign the token. This tool only decodes the header and payload for inspection purposes.

What do the timestamp claims mean?

iat (issued at) is when the token was created. exp (expiration) is when it expires. nbf (not before) is the earliest time the token is valid. All are Unix timestamps in seconds.

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