File parameterised Jenkins Job triggered in nodejs

file_param_jenkins_job_trigger.js

var axios = require('axios');
var FormData = require('form-data');
var fs = require('fs');
var data = new FormData();

const jenkinsUrl = 'http://example_jenkins_server_url.com/job/<JOB_NAME>/build';
// notice the URL has build not buildWithParameters if the job has file parameters. ^
const userName = 'example_user';
const password = 'example_pass'

const params = {"parameter": [
  // file0 here is the field name we are appending to data object, 
  // this informs jenkins while file maps to which job parameter, so even multiple file uploads can be done using this approach!
  {"name":"<Name Of file parameter in Job>", "file":"file0"}
  // incase you have additional string parameters you need to pass add it here. 
  {"name": "StringParam1", "value": "value"}
]}

data.append('file0', fs.createReadStream(<full file path>));
data.append('json', JSON.stringify(params));

var config = {
  method: 'post',
  url: jenkinsUrl,
  headers: { 
    Authorization: `Basic ${Buffer.from(`${userName}:${password}`).toString('base64')}`,
    ...data.getHeaders()
  },
  data : data
};

axios(config)
.then(function (response) {
  console.log(JSON.stringify(response.data));
})
.catch(function (error) {
  console.log(error);
});