Why won't browsers start with selenium nodejs?

Question

JavaScript

Why might this code not work? 2 drivers are in the same folder. But nothing happens at node index, after a minute the error is Timed out waiting for the WebDriver server at 127.0.0.1:52408/. I tried to run the driver myself, but nothing helps. Chrome driver of that version, checked

//index.js
const {Builder, By, Key, until} = require('selenium-webdriver');

async function example() {
  try{
      let driver = await new Builder().forBrowser('firefox').build();
      await driver.get('http://www.google.com/ncr');
      await driver.findElement(By.name('q')).sendKeys('webdriver', Key.RETURN);
  } catch (err){
    console.log(err)
  }
};

example()

Answer 1

It is necessary to launch selenium itself separately.
1. download wget selenium-release.storage.googleapis.com/3.9/seleni...
2. run java -jar selenium-server-standalone-3.9.1.jar
3. use

const { Builder, By, Key, until } = require('selenium-webdriver');

(async function example() {
  let driver = await new Builder().forBrowser('firefox').usingServer('http://localhost:4444/wd/hub').build();
  try {
    await driver.get('http://www.google.com/ncr');
    await driver.findElement(By.name('q')).sendKeys('webdriver', Key.RETURN);
    await driver.wait(until.titleIs('webdriver - Google Search'), 1000);
  } finally {
    await driver.quit();
  }
})();