node.js – Why do I have an error in require node js?

I’m trying to run some node.js code, however I get this error that module express doesn’t exist. And it seems that require keyword is the one that is raising the error: (File is a CommonJS module; it may be converted to an ES module)

I also had an error when trying to deploy the app in Render (with a start command of $node serverTest.js, build command $yarn and a runtime node).

I did install node.js

Why is this happening?

(I’m completely new to node.js and javascript)

const express = require('express');
const request = require('request');

const app = express();
const API_URL = 'openapi.naver.com'; // Replace this URL with your own

app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  next();
});

app.get('/api', (req, res) => {
  request(
    { url: `${API_URL}` },
    (error, response, body) => {
      if (error || response.statusCode !== 200) {
        return res.status(500).json({ type: 'error', message: error.message });
      }

      res.json(JSON.parse(body));
    }
  );
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(`listening on ${PORT}`));

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