Free JWT Token Decoder, Header & Payload Inspector

Decode and inspect JSON Web Tokens (JWT). View header algorithms, payload claims (sub, exp, iat), expiration timestamps, and signature details privately.

🔒 100% In-Browser & Zero Server Uploads

About JWT Token Decoder & Inspector

Decodes base64url-encoded JSON Web Tokens into structured JSON headers and payloads without transmitting confidential tokens or secrets over the internet.

How to Use JWT Token Decoder & Inspector Online

  1. Paste any JWT string into the input box.
  2. The tool instantly decodes the Header (algorithm) and Payload (claims).
  3. View human-readable dates for exp (expiration) and iat (issued at) claims.

Frequently Asked Questions

Is it secure to paste production authorization tokens here?
Yes, decoding is 100% client-side via JavaScript. No network requests are made, ensuring your authorization tokens remain strictly inside your browser.