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ToolNest AI
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JWT Decoder

Decode and inspect JSON Web Token headers and payloads.

vpn_keyJWT Decoder — no signature verification

About JWT Decoder

Paste any JSON Web Token to instantly decode and inspect its header, payload, and expiry information in a human-readable format. All decoding happens locally — no keys or data are ever sent to a server.

Frequently Asked Questions

No. This tool only decodes the header and payload. Signature verification requires the secret key and is intentionally excluded for security.

All decoding is done locally in your browser. No data is sent to any server. However, avoid pasting production tokens into any online tool as a general security practice.

'exp' is the expiration time — a Unix timestamp indicating when the token expires. The decoder shows this as a human-readable date and time.

The header specifies the token type and signing algorithm. The payload contains the claims — data like user ID, roles, and expiry. Both are base64url-encoded JSON objects.

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