Update Example

gistfile1.txt

var request = require('request');
 
request(
  {
    url: 'https://{appname}.form.io/app/api/{resourcename}/submission/{submissionId}',
    method: 'PUT',
    headers: {
      'x-jwt-token': token
    },
    form: {
      {fieldname1}: value1,
      {fieldname2}: value2
    }
  }
  function (error, response, body) {
    if (!error && response.statusCode == 200) {
      console.log(body);
    }
  }
);