100% Free · Client-Side · No Signup

JWT Token Decoder
& Inspector

Paste any JWT to instantly decode header, payload, inspect all claims, check expiry and algorithm — all in your browser.

🔑 Paste Your JWT Token

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Paste a JWT token above to decode and inspect it

Signature Algorithm

Raw Signature (Base64URL)

⚠️ Signature verification requires the secret key. This tool decodes the token structure only — it does not validate the signature cryptographically.

Why Use Our JWT Decoder?

Fast, private, and developer-friendly — all processing happens in your browser.

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100% Private

Your tokens never leave your browser. All decoding is done locally using vanilla JavaScript.

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Color-Coded View

See your token broken down visually with color-coded header, payload, and signature sections.

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Expiry Detection

Automatically detects iat, exp, nbf claims and shows a visual lifetime progress bar.

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Claim Descriptions

Explains standard JWT claims like sub, iss, aud, jti so you understand what each field means.

How It Works

Decode Any JWT in 3 Steps

Paste Token

Copy your JWT from a login response, API call, or auth header and paste it in the box.

Auto Decode

The tool instantly splits and base64url-decodes the header and payload as you type.

Inspect Claims

Explore all claims, check expiry status, and understand the algorithm used.

Frequently Asked Questions

Is it safe to paste my JWT here?

Yes. Everything runs locally in your browser. Your token is never sent to any server. However, if your token contains sensitive production credentials, we recommend using a disposable or test token for safety.

Can this tool verify JWT signatures?

No. Signature verification requires the secret key or public key used to sign the token. This tool decodes and inspects the token structure only — it cannot confirm authenticity.

What JWT algorithms are supported?

All standard algorithms work for decoding: HS256, HS384, HS512, RS256, RS384, RS512, ES256, PS256, and more. The tool reads the algorithm from the header and displays it — but does not perform algorithm-specific validation.

Why is my token showing as expired?

The exp claim contains a Unix timestamp. If the current time is past that timestamp, the token is considered expired. This is a client-side check based on your device clock.

JWT Token Decoder& Inspector