🔑 JWT Decoder

Decode and inspect JWT tokens instantly — view header, payload, and signature. Verify signatures with your secret. Free online JWT decoder — nothing sent to any server.

JWT Token

How to Use

Paste your JWT

Copy your JWT token (starting with eyJ) and paste it into the input field.

Click Decode

Press Decode to instantly split and decode all three parts: header, payload, and signature.

Inspect the token

Read the decoded JSON, check expiration dates, algorithm, and any custom claims in the payload.

Frequently Asked Questions

What is a JWT? +

A JSON Web Token (JWT) is a compact, URL-safe token used for authentication and information exchange. It consists of three Base64URL-encoded parts separated by dots: Header.Payload.Signature.

Is it safe to paste my JWT here? +

Yes. This tool runs 100% in your browser — your token is never sent to any server. However, never share JWTs containing sensitive data in public forums or untrusted tools.

Can this tool verify the JWT signature? +

No. Signature verification requires the secret key or public key used to sign the token, which only your server knows. This tool decodes and displays the token contents only.

What does "exp" mean in the payload? +

"exp" is the expiration time as a Unix timestamp (seconds since Jan 1, 1970). This tool automatically converts it to a human-readable date and shows whether the token has expired.

What is the difference between "iat" and "nbf"? +

"iat" (issued at) is when the token was created. "nbf" (not before) is the earliest time the token is valid. Both are Unix timestamps.

संपूर्ण गाइड: JWT Decoder

JWT Decoder क्या है?

JWT (JSON Web Token) Decoder tokens को decode करके उनके header, payload, और signature को human-readable format में display करता है। JWT authentication में widely used हैं — API calls को authenticate करने के लिए Bearer tokens के रूप में। Format: header.payload.signature (तीनों Base64URL encoded)।

यह tool debugging के लिए है: token expiration check करना, claims verify करना, और malformed tokens diagnose करना। Signature verification के लिए secret key चाहिए जो यह tool optionally support करता है।

कैसे उपयोग करें

JWT token paste करें input field में।
Decoded sections देखें: header (algorithm), payload (claims), signature।
Expiration time check करें — exp claim Unix timestamp होता है।
Secret key enter करें signature verification के लिए (optional)।

Pro Tips

JWT payload encoded है, encrypted नहीं — sensitive data payload में मत रखें।
iat (issued at) और exp (expires) claims हमेशा include करें।
Short expiration times use करें (15-60 min) refresh token pattern के साथ।