Our free JWT Token Generator & Decoder provides an interactive security solution to construct, sign, decode, and verify JSON Web Tokens (RFC 7519) directly inside your web browser. Supports standard HMAC signature algorithms (HS256, HS384, HS512), Base64URL string encoding, and custom secret keys. Easily add standard payload claims including Subject (sub), Issuer (iss), Audience (aud), Issued At (iat), and Expiration (exp) timestamps. Need to inspect existing token payloads? Use the Decode & Verify JWT mode to extract Header & Payload JSON objects and verify token expiration. All encoding and signature math runs 100% client-side in secure local JavaScript—meaning your secret keys and auth tokens are never uploaded to remote servers.
+1 Hr, +1 Day, +7 Days) with live validity badgetoken.jwtEdit the JSON payload claims or click a preset (User Auth, API Access, OAuth Refresh).
Enter your signature secret key, select algorithm (HS256), and set expiration claims (+1 hr, +1 day).
Inspect the compiled JWT string, copy the output, or download token.jwt.
Generates standard Header.Payload.Signature JWT structures with Base64URL encoding and HMAC signature calculation.
Decode arbitrary JWT token strings to inspect header metadata, claims, and verify whether a token is active or expired.
All Base64URL encoding, payload formatting, and signature math execute locally in your browser. Secret keys and tokens are never uploaded to any server.
A JSON Web Token (JWT) is an RFC 7519 open standard for securely transmitting JSON claims between stateless web applications and microservices via an encoded string.
A JWT string comprises 3 dot-separated Base64URL segments: Header.Payload.Signature. Base64URL encoding replaces + with - and / with _ while omitting trailing padding characters (=) for URL safety.
The HMAC SHA-256 (HS256) signature guarantees token authenticity and tampering protection. Standard claims like exp (Expiration Time) and iat (Issued At) protect against replay attacks.