HomeAll ToolsCoursesInterview PrepBlogAbout

JWT Decoder

Decode and inspect JWT tokens — view header, payload, and expiration without a secret key.

JWT Token

What is a JWT Token?

A JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are widely used in authentication.

JWT Structure

  • Header — algorithm and token type (e.g. HS256)
  • Payload — claims (user ID, roles, expiry, issued-at)
  • Signature — verifies tamper-evidence (requires secret)

Is it safe to decode JWTs here?

The header and payload of a JWT are only Base64url-encoded — not encrypted. This tool decodes them client-side. Never share production user tokens; use test tokens for debugging.

FAQ

Can I verify the JWT signature here?
No — signature verification needs the secret key (HMAC) or public key (RSA/EC). This tool decodes the payload without verifying it.
What does "exp" mean?
"exp" is the expiration time claim — a Unix timestamp after which the token must not be accepted. This tool shows it in human-readable form.

Other browser-based tools developers reach for alongside the JWT Decoder.

🛡️
Password Generator

Generate cryptographically strong passwords with custom rules.

#️⃣
Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text.

🧠
Hash Intelligence

Identify, generate, verify and analyze hashes — plus password crack-risk estimator.

📋
JSON Formatter

Format, validate and minify JSON with instant error detection.