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JWT verification

Method 1) Using JWKS endpoint

Some libraries let you provide a JWKS endpoint to verify a JWT. The JWKS endpoint exposed by SuperTokens is availble at the following URL:

curl --location --request GET '<YOUR_API_DOMAIN>/auth/jwt/jwks.json'

Below is an example for NodeJS showing how you can use jsonwebtoken and jwks-rsa together to achieve JWT verification using the jwks.json endpoint.

import JsonWebToken, { JwtHeader, SigningKeyCallback } from 'jsonwebtoken';
import jwksClient from 'jwks-rsa';

var client = jwksClient({
  jwksUri: '<YOUR_API_DOMAIN>/auth/jwt/jwks.json'
});

function getKey(header: JwtHeader, callback: SigningKeyCallback) {
  client.getSigningKey(header.kid, function (err, key) {
    var signingKey = key!.getPublicKey();
    callback(err, signingKey);
  });
}

let jwt = "...";
JsonWebToken.verify(jwt, getKey, {}, function (err, decoded) {
  let decodedJWT = decoded;
  // Use JWT
});

Method 2) Using public key string

Some JWT verification libraries require you to provide the JWT secret / public key for verification. You can obtain the JWT secret from SuperTokens in the following way:

• First, we query the JWKS.json endpoint:

  curl --location --request GET '<YOUR_API_DOMAIN>/auth/jwt/jwks.json'
  
  {
    "keys": [
      {
        "kty": "RSA",
        "kid": "2de612a5-a5ba-413e-9216-4c43e2e78c86",
        "n": "AMZruthvYz7Ft-Dp0BC_SEEJaWK91s_YA-RR81iLJ6BTT6gJp0CcV4DfBynFU_59dRGOZyVQpAW6Drnc_6LyZpVWHROzqt-Fjh8TAqodayhPJVuZt25eQiYrqcaK_dnuHrm8qwUq-hko6q1o1o9NIIZWNfUBEVWmNhyAJFk5bi3pLwtKPYrUQzVLcTdDUe4SIltvvfpYHbVFnYtxkBVmqO68j7sI8ktmTXM_heals-W6WmozabDkC9_ITCeRat2f7A2l0t4QzO0ZCzZcJfhusF4X1niKgY6yYXpbX6is4HCfhYfdabcE52xYMNl-gw9XDjsIxfBMUDvOFRHWlx0rU8c=",
        "e": "AQAB",
        "alg": "RS256",
        "use": "sig"
      }
    ]
  }

• Next, we run the NodeJS script below to convert the above output to a PEM file format.

  import jwkToPem from 'jwk-to-pem';
  
  // This JWK is copied from the result of the above SuperTokens core request
  let jwk = {
    "kty": "RSA",
    "kid": "2de612a5-a5ba-413e-9216-4c43e2e78c86",
    "n": "AMZruthvYz7Ft-Dp0BC_SEEJaWK91s_YA-RR81iLJ6BTT6gJp0CcV4DfBynFU_59dRGOZyVQpAW6Drnc_6LyZpVWHROzqt-Fjh8TAqodayhPJVuZt25eQiYrqcaK_dnuHrm8qwUq-hko6q1o1o9NIIZWNfUBEVWmNhyAJFk5bi3pLwtKPYrUQzVLcTdDUe4SIltvvfpYHbVFnYtxkBVmqO68j7sI8ktmTXM_heals-W6WmozabDkC9_ITCeRat2f7A2l0t4QzO0ZCzZcJfhusF4X1niKgY6yYXpbX6is4HCfhYfdabcE52xYMNl-gw9XDjsIxfBMUDvOFRHWlx0rU8c=",
    "e": "AQAB",
    "alg": "RS256",
    "use": "sig"
  };
  
  let certString = jwkToPem(jwk);

  The above snippet would generate the following certificate string:

  -----BEGIN PUBLIC KEY-----
  MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxmu62G9jPsW34OnQEL9I
  QQlpYr3Wz9gD5FHzWIsnoFNPqAmnQJxXgN8HKcVT/n11EY5nJVCkBboOudz/ovJm
  lVYdE7Oq34WOHxMCqh1rKE8lW5m3bl5CJiupxor92e4eubyrBSr6GSjqrWjWj00g
  hlY19QERVaY2HIAkWTluLekvC0o9itRDNUtxN0NR7hIiW2+9+lgdtUWdi3GQFWao
  7ryPuwjyS2ZNcz+F5qWz5bpaajNpsOQL38hMJ5Fq3Z/sDaXS3hDM7RkLNlwl+G6w
  XhfWeIqBjrJheltfqKzgcJ+Fh91ptwTnbFgw2X6DD1cOOwjF8ExQO84VEdaXHStT
  xwIDAQAB
  -----END PUBLIC KEY-----

• Now you can use the generated PEM string in your code like shown below:

  import JsonWebToken from 'jsonwebtoken';
  
  // Truncated for display
  let certificate = "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhki...\n-----END PUBLIC KEY-----";
  let jwt = "...";
  JsonWebToken.verify(jwt, certificate, function (err, decoded) {
      let decodedJWT = decoded;
      // Use JWT
  });