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Analyze Security Tokens with the JWT Decoder
Inspect your JSON Web Tokens (JWT) instantly with our free JWT Decoder. This developer-focused tool allows you to decode headers and payloads to verify claims, check expiration dates, and debug authentication flows. Because we utilize client-side decoding, your sensitive security tokens are never transmitted to a server, ensuring your credentials remain private and secure.
How to Decode a JWT
- 01. Paste Token: Copy your encoded JWT (Header.Payload.Signature) into the input field.
- 02. Real-Time Analysis: The tool automatically parses the three segments of your token.
- 03. Inspect Claims: View the decoded JSON objects for both the Header and the Payload.
- 04. Verify Expiry: Check the "exp" claim to determine if the token is still valid or has expired.
Frequently Asked Questions
Is my JWT data secure when using this tool?
Yes. This tool uses local browser-based decoding. Your token is never uploaded to any server, keeping your secret keys and user data completely private.
What information can I see with the JWT Decoder?
You can view the algorithm used for signing (Header) and all the data claims (Payload), such as user IDs, permissions, and expiration timestamps.
Why doesn't the tool verify the signature?
Signature verification requires your private/public keys. For security reasons, we focus on decoding for inspection and debugging without asking for your sensitive keys.
What is the "Zero Server Load" feature?
This means the tool runs entirely on your device's hardware. It doesn't use our server's resources, which allows for instant results even if your internet connection is slow.
Does this tool work with all types of JWTs?
Yes, it supports standard Base64Url encoded JWTs. If the token follows the standard format of three segments separated by dots, it will decode successfully.
How do I know if my token has expired?
Look at the "exp" (expiration) field in the payload. Our tool automatically converts this Unix timestamp into a human-readable date for easy checking.