JWT Decoder

Decode Tokens

Decode JWT tokens instantly — view header, payload, and expiration details

Paste JWT Token

What is JWT Decoder?

The JWT Decoder is a secure, client-side utility that allows developers to decode and inspect JSON Web Tokens (JWT). It easily separates and displays the token's Header, Payload, and Signature without requiring the secret key.

How to Use JWT Decoder

Paste Token

Paste your encoded JWT string into the input field.

View Header

Instantly see the decoded header, revealing the algorithm and token type.

Inspect Payload

Examine the decoded payload to view claims like user ID, roles, and expiration time.

Check Expiry

Quickly verify if the token has expired based on the 'exp' claim.

Key Features

Instant decoding of JWTs entirely in the browser

Clear separation of Header, Payload, and Signature components

Automatic formatting of JSON data for readability

Highlighting of essential claims like 'iat' (issued at) and 'exp' (expiration)

Secure operation—tokens are never sent to a server

Tips & Best Practices

1
Use this tool to debug authentication issues by verifying the claims encoded in your tokens.
2
Remember that decoding a JWT does not verify its validity; it only reveals its contents. Anyone can decode a JWT without the secret key.
3
Check the 'exp' claim if users are being unexpectedly logged out.

Why Use Our Online JWT Decoder?

JWT Decoder gives developers a fast, distraction-free utility that runs entirely client-side. No accounts, no data sent to any server, no extensions to install. Paste your input, get your output, copy to clipboard — designed to slot into your daily workflow without breaking your flow.

Client-SideCode stays private

Zero SetupNo installs needed

Copy to ClipboardOne-click workflow

Open StandardsCommon formats

Frequently Asked Questions

Is it safe to paste my production JWT here?

Yes, the decoding process happens 100% locally in your browser using JavaScript. No data is sent over the network.

Can this tool verify the signature of the JWT?

No, this tool only decodes the Base64Url encoded parts of the token. Signature verification requires the private server key.

Why is the payload showing garbled text?

This usually happens if the string provided is not a valid JWT or is encrypted rather than just encoded.

What do the 'iat' and 'exp' fields mean?

'iat' stands for 'Issued At' (when the token was created), and 'exp' stands for 'Expiration' (when the token becomes invalid). Both are Unix timestamps.

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