npm i puppeteer

const puppeteer = require('puppeteer');

(async () => {
    // set some options (set headless to false so we can see 
    // this automated browsing experience)
    let launchOptions = { headless: false, args: ['--start-maximized'] };

    const browser = await puppeteer.launch(launchOptions);
    const page = await browser.newPage();

    // set viewport and user agent (just in case for nice viewing)
    await page.setViewport({width: 1366, height: 768});
    await page.setUserAgent('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36');

    // go to the target web
    await page.goto('https://easyupload.io/');

    // get the selector input type=file (for upload file)
    await page.waitForSelector('input[type=file]');
    await page.waitFor(1000);

    // get the ElementHandle of the selector above
    const inputUploadHandle = await page.$('input[type=file]');

    // prepare file to upload, I'm using test_to_upload.jpg file on same directory as this script
    // Photo by Ave Calvar Martinez from Pexels https://www.pexels.com/photo/lighthouse-3361704/
    let fileToUpload = 'test_to_upload.jpg';

    // Sets the value of the file input to fileToUpload
    inputUploadHandle.uploadFile(fileToUpload);

    // doing click on button to trigger upload file
    await page.waitForSelector('#upload');
    await page.evaluate(() => document.getElementById('upload').click());

    // wait for selector that contains the uploaded file URL
    await page.waitForSelector('#upload-link');
    await page.waitFor(5000);

    // get the download URL
    let downloadUrl = await page.evaluate(() => {
        return document.getElementById('upload-link').value;
    });

    // display the result on console
    console.log({'file': fileToUpload,
                 'download_url': downloadUrl});

    // close the browser
    await browser.close();
})();

node upload_file.js

{
  file: 'test_to_upload.jpg',
  download_url: 'https://easyupload.io/ffbvzk'
}