Buffer in JS file isn’t recognized (API tests automation with Karate Framework)

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I was able to successfully base64Decode a JWT token payload to JSON using the following code without the need for a Java method:

  Background:
    * def parseJwt =
  """
  function(token) {
      var base64Url = token.split('.')[1];
      var base64Str = base64Url.replace(/-/g, '+').replace(/_/g, "https://stackoverflow.com/");
      var Base64 = Java.type('java.util.Base64');
      var decoded = Base64.getDecoder().decode(base64Str);
      var String = Java.type('java.lang.String')
      return new String(decoded)
  };
  """

  Scenario: JWT Token
    Given path  'jwt/authenticate'
    And header x-goog-authenticated-user-email="email"
    And request {}
    When method get
    Then status 200
    * json result = parseJwt(responseHeaders['Set-Cookie'][0])
    * match result == {permissions: [1,2,3], iss: "us", exp: "#number", email: "email"}

Note: It does seem to be required to use json rather than def as Karate does better if it parses the string to json itself. Also, you may obtain the token from a header rather than a cookie as in this example if so, just change the responseHeader that you are looking for.

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