Fast, practical, browser-based developer tools
Decode JWT header and payload instantly in your browser. Inspect claims such as
exp, iat, sub, aud, and other token fields
for development, debugging, and authentication workflows. This tool decodes token contents only
and does not verify signatures.
JWT tokens are commonly used in authentication and authorization systems. During development, debugging, and integration testing, it is often useful to inspect the token header and payload to see which claims are present and whether the token structure looks correct. This tool helps you decode those parts quickly without sending the token to a backend as part of the normal tool flow.
This page only decodes the token contents. It does not verify the JWT signature, validate the token against a secret or public key, or confirm that the token is trusted.
Decoding a token helps you inspect its contents, but it does not prove authenticity. Always perform signature verification in your application or backend security workflow.
Paste a JWT token into the input area and click Decode JWT. The tool will split the token into its three segments, decode the header and payload from Base64URL, and show them as formatted JSON when possible.
JWT tokens usually contain three sections separated by dots:
header.payload.signature
This tool decodes the first two parts into readable JSON and shows the third part as the signature segment for reference.
A JWT decoder is a tool that reads the encoded header and payload sections of a JSON Web Token and converts them into readable JSON. This helps developers inspect claims and token metadata without having to manually decode Base64URL data.
It is useful for understanding token contents during authentication testing, API integration, identity workflows, and debugging.
When decoding a JWT, you may want to inspect claims such as:
No. It only decodes the token parts for inspection. It does not verify the signature or confirm that the token is trusted.
Yes. Any decoded claims in the payload will appear in formatted JSON, including fields
like exp, iat, and other standard or custom claims.
The tool will show an error if the JWT does not contain the expected structure or if the header and payload cannot be decoded properly.
Yes. This tool is free to use online and works directly in the browser.
No. This page is designed to decode the token in the browser during normal use.