JWT Decoder

Decode JSON Web Tokens instantly. Paste a JWT to see its header and payload. Free, secure, and works directly in your browser.

How to use JWT Decoder

  1. Paste your encoded JWT string into the input field.
  2. Click the 'Decode' button to process the token.
  3. Review the decoded header and payload sections displayed below.

Features

  • Decodes standard JWT headers and payloads instantly.
  • Presents decoded data in a clear, human-readable JSON format.
  • Works entirely in your browser—no data is sent to external servers.
  • Supports tokens using the HS256, RS256, and other common JWT algorithms.

Who Is This Tool For?

This tool is essential for developers debugging authentication flows, security engineers auditing API requests, and anyone who needs to inspect the contents of a JWT token.

Why Decode a JWT?

Decoding a JSON Web Token is crucial for verifying its contents, debugging authentication and authorization issues, and ensuring secure API integrations by inspecting claims like user roles and expiration.

Frequently Asked Questions

Is this JWT decoder free?

Are my tokens sent to a server?

What does this JWT decoder show?

Can I decode any JWT?

Does this tool validate the token signature?

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