jwt decoder

JWT Decoder

Decode JWT header and payload locally without verifying the signature.

Runs locally in your browser No uploads Instant results

Instant results

JWT Decoder

Runs in your browserInput type: JWTOutput type: JSON
Examples
Ready to convert

Practical use

When to use JWT Decoder

This developer utility is designed for quick inspection, formatting and cleanup while working with code, API responses or technical content. JWT Decoder runs locally in the browser, so you can test real input, copy the result or download a file without uploading data to a server.

  • Header
  • Payload
  • Local only

Example

Sample JWT

The JWT Decoder example shows the input shape this tool expects. Load it with the sample button, change values and immediately see how the output changes.

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYW1lIjoiRGFuYSIsImFkbWluIjpmYWxzZX0.signature

How to use this converter

How to use this converter

  1. Paste a JWT.
  2. Decode header and payload.
  3. Do not treat this as signature verification.

FAQ

FAQ

What input does JWT Decoder expect?

JWT Decoder expects JWT input and returns JSON output. Start with the sample if you are unsure about the expected structure.

Why did JWT Decoder show an error?

Errors usually mean the input is empty, incomplete or not valid JWT. Check brackets, quotes, separators and special characters before converting again.

Is my data uploaded to a server?

No. The conversion runs in your browser, so your input does not need to leave your device.

Can I use this converter for free?

Yes. The tools are free to use, with simple advertising that helps keep the site available.

Before converting

How to get a cleaner result

  • For developer tools, validate the result before using it in production code or API requests.
  • Try the built-in sample first to understand the expected input shape.
  • Check that the input is complete before copying or downloading the output.
  • If an error appears, reduce the input to a smaller section and test again.

Common issues

What to check if something fails

  • JWT decoding is not signature verification.
  • Malformed Base64 sections will fail.
  • Never paste sensitive production tokens into shared screens.

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