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README.md
Java JWT: JSON Web Token for Java
JJWT library is intended to be the easiest to use and understand library for creating and verifying JSON Web Tokens (JWTs) on the JVM, period.
JJWT is a 'clean room' implementation based solely on the JWT, JWS, JWE and JWA RFC draft specifications.
Installation
Use your favorite Maven-compatible build tool to pull the dependency (and its transitive dependencies) from Maven Central:
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.1</version>
</dependency>
Usage
Most complexity is hidden behind convenient and readable Builder chaining calls. Here's an example:
import io.jsonwebtoken.Jwts;
import static io.jsonwebtoken.SignatureAlgorithm.*;
//Let's create a random signing key for testing:
Random random = new SecureRandom();
byte[] key = new byte[64];
random.nextBytes(key);
Claims claims = Jwts.claims().setIssuer("Me").setSubject("Joe");
String jwt = Jwts.builder().setClaims(claims).signWith(HS256, key).compact();
How easy was that!?
Now let's verify the JWT (you should always discard JWTs that don't match an expected signature):
Token token = Jwts.parser().setSigningKey(key).parse(jwt);
assert token.getClaims().getSubject().equals("Joe");
You have to love one-line code snippets in Java!
But what if signature validation failed? You can catch SignatureException
and react accordingly:
try {
Jwts.parser().setSigningKey(key).parse(jwt);
//OK, we can trust this JWT
} catch (SignatureException e) {
//don't trust the JWT!
}
Supported Features
-
Creating and parsing plaintext compact JWTs
-
Creating, parsing and verifying digitally signed compact JWTs (aka JWSs) with the following algorithms:
- HS256: HMAC using SHA-384
- HS384: HMAC using SHA-384
- HS512: HMAC using SHA-512
- RS256: RSASSA-PKCS-v1_5 using SHA-256
- RS384: RSASSA-PKCS-v1_5 using SHA-384
- RS512: RSASSA-PKCS-v1_5 using SHA-512
- PS256: RSASSA-PSS using SHA-256 and MGF1 with SHA-256
- PS384: RSASSA-PSS using SHA-384 and MGF1 with SHA-384
- PS512: RSASSA-PSS using SHA-512 and MGF1 with SHA-512
Currently Unsupported Features
- Non-compact serialization and parsing.
- Elliptic Curve signature algorithms
ES256
,ES384
andES512
. - JWE (Encryption for JWT)
These feature sets will be implemented in a future release when possible. Community contributions are welcome!