Rule Definition
Ensure that each web service callback is going to be properly checked in order to make sure you will not miss any problem that occurred in your application and you will give the information to the user.

Remediation
Always use JSON.parse in try/catch block

Violation Code Sample

function readJSON(filePath, callback) {

  fs.readFile(filePath, function(err, data) {

    var parsedJson;

    // Handle error
    if (err) {
      return callback(err);
    }

    // Parse JSON
    parsedJson = JSON.parse(data);

    return (parsedJson !== 'undefined');
  });
}

Fixed Code Sample

function readJSON(filePath, callback) {

  fs.readFile(filePath, function(err, data) {

    var parsedJson;

    // Handle error
    if (err) {
      return callback(err);
    }

    // Parse JSON
    try {
      parsedJson = JSON.parse(data);
    } catch (exception) {
      return callback(exception);
    }

    // Everything is ok
    return callback(null, parsedJson);
  });
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/JSON_bad_parse