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JWT Claims

Verification of a JWT (JSON Web Token) Claims Set for Elixir

Description

An Elixir implementation of the JSON Web Token (JWT) optional registered claims, RFC 7519

Usage

Add JwtClaims as a dependency in your mix.exs file:

defp deps do
  [{:jwt_claims, "~> 0.0"}]
end

JwtClaims.verify(jwt, options)

Returns a tuple, either:

• {:ok, claims}, a JWT claims set map, if the JWT Message Authentication Code (MAC), or signature, is verified and the registered claims are also verified
• {:error, [rejected_claims]}, a list of any registered claims that fail validation, if the JWT MAC is verified
• {:error, "invalid JWT"} if the JWT MAC is not verified
• {:error, "invalid input"} otherwise

"jwt" (required) is a JSON web token string

options (required) map

• alg (optional, default: "HS256")
• key (required unless alg is "none")

Please refer to the JSON Web Token package for additional guidance regarding JWT options

Example

secure_jwt_example = "eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt.cGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk"

# verify with default algorithm, HMAC SHA256
{:ok, verified_claims} = JwtClaims.verify(secure_jwt_example, %{key: "gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr9C"})

Supported registered claim names

• "iss" (Issuer)
• "sub" (Subject)
• "aud" (Audience)
• "exp" (Expiration Time)
• "nbf" (Not Before)
• "iat" (Issued At)
• "jti" (JWT ID)

Supported Elixir versions

Elixir 1.1 and up