JSON Web Token

Swift implementation of JSON Web Token.

Installation

CocoaPods is the recommended installation method.

pod 'JSONWebToken'

Usage

import JWT

Encoding a claim

JWT.encode(claims: ["my": "payload"], algorithm: .hs256("secret".data(using: .utf8)!))

Encoding a claim set

var claims = ClaimSet()
claims.issuer = "fuller.li"
claims.issuedAt = Date()
claims["custom"] = "Hi"

JWT.encode(claims: claims, algorithm, algorithm: .hs256("secret".data(using: .utf8)))

Building a JWT with the builder pattern

JWT.encode(.hs256("secret".data(using: .utf8))) { builder in
  builder.issuer = "fuller.li"
  builder.issuedAt = Date()
  builder["custom"] = "Hi"
}

Decoding a JWT

When decoding a JWT, you must supply one or more algorithms and keys.

do {
  let claims: ClaimSet = try JWT.decode("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.2_8pWJfyPup0YwOXK7g9Dn0cF1E3pdn299t4hSeJy5w", algorithm: .hs256("secret".data(using: .utf8)!))
  print(claims)
} catch {
  print("Failed to decode JWT: \(error)")
}

When the JWT may be signed with one out of many algorithms or keys:

try JWT.decode("eyJh...5w", algorithms: [
  .hs256("secret".data(using: .utf8)!),
  .hs256("secret2".data(using: .utf8)!),
  .hs512("secure".data(using: .utf8)!)
])

You might also want to give your iat, exp and nbf checks some kind of leeway to account for skewed clocks. You can do this by passing a leeway parameter like this:

try JWT.decode("eyJh...5w", algorithm: .hs256("secret".data(using: .utf8)!), leeway: 10)

Supported claims

The library supports validating the following claims:

• Issuer (iss) Claim
• Expiration Time (exp) Claim
• Not Before (nbf) Claim
• Issued At (iat) Claim
• Audience (aud) Claim

Algorithms

This library supports the following algorithms:

• none - Unsecured JWTs
• hs256 - HMAC using SHA-256 hash algorithm (default)
• hs384 - HMAC using SHA-384 hash algorithm
• hs512 - HMAC using SHA-512 hash algorithm

License

JSONWebToken is licensed under the BSD license. See LICENSE for more info.