JWT Decoder

What is JWT Decoder?

A JSON Web Token (JWT) is a compact, self-contained token used widely for authentication and authorization. It consists of a header, a payload and a signature separated by dots. This decoder unpacks the header and payload and surfaces the registered claims — including the expiration time — entirely in your browser without verifying the signature.

How to use

1. Paste the full JWT string into the input field.
2. Click Decode to split the token into its three parts.
3. Review the decoded header, payload and individual claims.
4. Check the expiry status to see whether the token has already lapsed.

Use Cases

• Inspecting an access token returned by an API during integration work.
• Checking a token's expiry and scope claims before debugging a 401 error.
• Understanding the structure of tokens issued by OAuth or identity providers.