Playwright & NodeJs - Read CSV and push data to an array

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I am using the playwright library for web scraping and URLs are stored in a CSV file. I am trying to read the CSV file and pick the URLs in an array to utilize in the scraping code.

Here is the code I wrote.

// Support    
const csv = require('csv-parser');
const fs = require('fs');

// Array to store the URL.
var urls = [];
// This prints an empty array.
console.log(urls);

fs.createReadStream('sample.csv')
  .pipe(csv())
  .on('data', (row) => {
    // Trying push the URL in the array
    urls.push(row);

    // This prints the values of URLs
    console.log(urls);
  })
  .on('end', () => {
    console.log('CSV file successfully processed');
  });
// Here I don't see the URLs but an empty array.
console.log("URLS:" + urls);

In the method ".on('data'" the value gets pushed to the array and the console is also printing those, however, post-execution when I try to get the URLs from the array it returns an empty array.

playwright node.js web-scraping arrays javascript
1 Answers

This answer is written assuming that links are the only thing that are in your CSV file.

const { test } = require('@playwright/test');
const fs = require("fs");

// Reads the CSV file and saves it  
var links = fs.readFileSync('Path/to/csv')
    .toString() // convert Buffer to string
    .split('\n') // split string to lines
    .map(e => e.trim()) // remove white spaces for each line

// Start of for loop, to loop through csv file
for (const link of links) {
    // Normal test set up for playwright. adding the + link.toString to avoid duplicate test name error
    test('test for ' + link.toString(), async ({ page }) => {
        // First csv file item sent to console
        console.log(link);
        // Goes to that csv link item
        await page.goto(link);
        // Do whatever else you need
    });
}
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