Is it safe to paste my JWT here?

Yes — this tool runs entirely in your browser. Your token is never sent to any server. That said, avoid pasting production tokens from sensitive systems into any online tool as a general security habit.

Can this tool verify the JWT signature?

No. Signature verification requires the secret key (for HS256) or the public key (for RS256/ES256), which you should never share. This tool decodes the header and payload, which are only Base64-encoded — not encrypted — and readable without the key.

What is a JWT used for?

JWTs are commonly used for authentication and authorization. After logging in, a server issues a signed JWT containing claims (like user ID and roles). The client sends this token with each request, and the server verifies the signature to trust the claims without a database lookup.

Why does my JWT say it is expired?

The exp claim is a Unix timestamp. If the current time is past that value, the token is expired. You need to re-authenticate to get a fresh token. This tool shows the human-readable expiry date so you can easily check.

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JWT Token Decoder & Validator

Decode and validate JWT tokens instantly. View header, payload, expiry, issued-at, and signature. Checks if token is expired. No token is sent to any server — fully private.

About This Tool

Decode and inspect JSON Web Tokens (JWTs) without sending anything to a server. Paste any JWT to instantly view the decoded header and payload as formatted JSON, check the expiry time, and validate the token structure.