BBuildQuill
Developer Tools

JWT Decoder

Decode and inspect JWT tokens instantly in your browser. No data is sent to any server.

How to Use JWT Decoder

1

Paste your JWT

Copy and paste a JWT token string into the input field.

2

Inspect the decoded output

The header and payload are decoded and formatted as JSON instantly.

3

Check expiry status

The tool highlights whether the token is still valid or has expired.

What is the JWT Decoder?

Paste any JSON Web Token to instantly decode its header and payload. See the algorithm, claims, expiration status, and issued-at timestamps without needing a secret key. Nothing is sent to a server.

  • Decode JWT header and payload in one click
  • Shows expiration status and timestamps
  • Displays all standard and custom claims
  • Color-coded sections for header, payload, and signature
  • No secret key required for decoding
  • Fully client-side with no data sent to any server

Frequently Asked Questions

Is my token sent to a server?
No. Decoding happens entirely in your browser using JavaScript. Your JWT never leaves your device.
What is the difference between a JWT's parts?
A JWT has three parts: Header (algorithm and token type), Payload (claims/data), and Signature (verification hash). Only the header and payload are decoded - the signature stays raw.
Can I verify the signature here?
No. Signature verification requires the secret key and is a server-side operation. This tool only decodes and inspects the readable parts.

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