JWT Decoder

Free

Decode JWT tokens and inspect header, payload, and expiry.

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About JWT Decoder

Decode and inspect JSON Web Tokens (JWTs) instantly in your browser. Paste any JWT to see the decoded header, payload, and signature. Checks token expiry and highlights claims like iss, sub, aud, and exp. No data leaves your browser.

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How to Use JWT Decoder

Quickly decode and inspect JSON Web Tokens to view headers, payloads, and claim details directly in your browser.

1
Access the JWT Decoder tool
Navigate to the JWT Decoder tool page in your web browser to begin the inspection process.
2
Paste your JWT into the input
Copy your encoded JSON Web Token and paste it into the provided text area. The tool will automatically begin processing the string.
3
Inspect the decoded header and payload
Review the automatically decoded JSON data to see the algorithm, type, and specific claims like issuer or subject.
4
Verify token expiry and claims
Check the highlighted claims to verify the 'exp' timestamp and ensure the token has not expired. The tool identifies standard claims for easy reading.
5
Analyze the signature status
View the signature component of the token to complete your inspection of the three-part JWT structure.

Estimated time: PT1M

Frequently Asked Questions

What is the JWT Decoder tool and how does it work?

This tool is a browser-based utility designed to instantly decode and inspect JSON Web Tokens (JWTs). By pasting a token into the input field, the tool breaks down the encoded string into its three core components: the header, the payload, and the signature.

How do I use this tool to inspect a JSON Web Token?

To use the tool, simply paste your JWT or bearer token into the provided text area. The decoder will automatically process the string and display the decoded JSON data, highlighting specific claims such as issuer (iss), subject (sub), audience (aud), and expiration (exp).

Is my token data sent to a server for decoding?

No, your data never leaves your browser. This JWT Decoder performs all decoding operations locally on your device, ensuring that sensitive authentication tokens and claims remain private and secure.

Can this tool tell me if my JWT has expired?

Yes, the tool specifically checks the token's expiry status. It identifies and highlights the 'exp' claim within the payload to help you determine if the token is still valid or if it has already timed out.

Is there a cost to use the JWT Decoder?

This tool is completely free to use and does not require any credits. While there are generous rate limits for both anonymous and authenticated users, the tool remains part of our free developer tier.

What are the browser requirements for using the JWT Decoder?

Since the tool functions as a client-side web application, it requires a modern web browser with JavaScript enabled. No additional software or plugins are needed to decode and inspect your tokens.

Can I use this tool to verify a JWT signature?

While this tool allows you to inspect the signature component of a JWT, its primary function is decoding and visualizing the header and payload claims. It is designed for inspection and debugging rather than cryptographic signature validation.

How to Decode and Inspect JSON Web Tokens (JWT) Instantly

JWT Decoder: Inspect Header, Payload, and Expiry Online

Decode JSON Web Tokens instantly with our JWT Decoder. Inspect headers, payloads, and claims like exp, iss, and sub securely in your browser. No data leaves.

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