jsonpost
Generators & Utilities

JWT Decoder

Decode JSON Web Tokens to inspect the header and payload as formatted JSON, entirely in your browser.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste your JWT into the editor.
  2. 2View the decoded header and payload as formatted JSON.
  3. 3Check claims like expiry, issuer, and audience.

Frequently asked questions

Is my token sent anywhere?
No. JWTs are decoded entirely in your browser. Your token never leaves your device, which is essential for security.
Does it verify the signature?
This tool decodes and inspects the token contents. It does not verify the signature, which requires your secret or public key.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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