What is JWT Encoder?

Creates JSON Web Tokens (JWTs) with HMAC signatures (HS256/384/512). JWT structure: header.payload.signature, base64-url encoded. Used for: API authentication, session tokens, stateless auth, microservices, OAuth flows. Generated JWTs work in any system supporting JWT standard (RFC 7519).

Tips

• Always use strong secret keys (32+ random chars)
• Include exp claim for expiration
• Don't store sensitive data in payload — JWT is signed not encrypted
• HS256 is sufficient; SHA-512 for highest security
• Use RS256 (asymmetric) for distributed systems

FAQs

Is JWT encrypted?

No. Signed (integrity guaranteed) but readable. Use JWE for encryption. Never store passwords/PII in JWT payload.

Why use JWT vs sessions?

Stateless: no server-side session storage. Scales across servers. Used in modern APIs, SPAs, microservices.

How long should JWT live?

Access tokens: 15min-1hr. Refresh tokens: days-weeks. Never permanent.