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JWT Creator

Create and generate JSON Web Tokens with custom headers, payloads, and signatures

Status:
Ready to Generate
Algorithm: HS256

Signature

Choose the signing algorithm for your JWT

Secret key for HMAC signature

Header

Payload

The principal that issued the JWT

The principal that is the subject of the JWT

The recipients that the JWT is intended for

Not set

The time after which the JWT expires

Not set

The time before which the JWT must not be accepted

9/3/2025, 11:26:11 AM

The time at which the JWT was issued

A unique identifier for the JWT

Generated JWT

Length: 0

About JWT Creation

How it works

This tool creates JWTs by encoding the header and payload in Base64URL format, then generating a signature using the selected algorithm and secret key.

Security Warning

This is for development and testing purposes. In production, use proper libraries and never expose secret keys. RSA/ECDSA algorithms shown here are for demo only.

JWT Creator - Generate JSON Web Tokens Online

A JWT creator helps you generate signed tokens for development and QA by assembling a header, payload (claims), and signature. Use it to prototype authentication flows, test Authorization: Bearer integration, and learn how algorithms like HS256 (HMAC) and RS256 (RSA) sign data.

What is a JWT?

A JSON Web Token is three Base64URL‑encoded parts joined by dots: header.payload.signature. The header declares type and alg (for example, HS256, RS256). The payload carries claims such as iss (issuer), sub (subject), aud (audience), exp (expiration), and custom fields. The signature is computed over header and payload with a shared secret (HMAC) or private key (RSA/ECDSA), allowing recipients to verify integrity and authenticity statelessly.

How JWTs work

A server authenticates a user, signs a token, and returns it to the client. Clients include the token in Authorization: Bearer <JWT>. The server verifies the signature, checks exp and nbf, then applies authorization based on scopes/roles. Because JWTs are self‑contained, they scale well across microservices and CDNs, but require strict key rotation, short lifetimes, and careful claim design to avoid bloat or leakage.

About the JWT Creator tool

Choose HS256/HS384/HS512 for HMAC with a shared secret or RS256/ES256 for asymmetric keys. Set standard claims (iss, sub, aud, exp, nbf, iat, jti) and add custom claims, then sign to produce the JWT. Copy the token into curl or your HTTP client to test protected endpoints. Don’t expose real secrets in browsers; never store private keys in client code.

Further reading

JWTs are powerful when used carefully: choose the smallest practical claim set, prefer short lifetimes, and rotate keys. This tool helps you learn and prototype safely before implementing production‑grade token services.