querySelectorAll: Will be used to to collect each question element.We will use the JavaScript methods querySelectorAll and querySelector to extract both question and excerpt, and return as result an array of objects. For some strange reason, sorting the data (before the timed region) miraculously makes the loop almost six times faster.
#Webscraper not showing all data code#
Here is a piece of C++ code that shows some very peculiar behavior. Why is processing a sorted array faster than processing an unsorted array? To a location of your choice, create and navigate to a new directory by executing the following commands: Get started by creating a new directory that will hold the application code.
Scrap pages via a simple API call using Express. 
To deploy a web scraper using Puppeteer, Express.js, and Docker on Koyeb, you need to follow these steps: However, make sure your version of Node.js is at least 10.18.1 as we are using Puppeteer v3+.įor more information take a look at the official readme on the Puppeteer Github repository. This tutorial does not require any prior knowledge of Puppeteer as we will go through every step of setting up and running a web scraper. A GitHub account to version and deploy your application code on Koyeb.
A Koyeb account to deploy and run the application. A local development environment with Node.js installed. To successfully follow and complete this guide, you need: In this guide, we will first create scripts to showcase Puppeteer capabilities, then we will create an API to scrape pages via a simple HTTP API call using Express.js and deploy our application on Koyeb. Capture a timeline trace of your site to help diagnose performance issues. Create an up-to-date, automated testing environment. Automate form submission, UI testing, keyboard input, and interface interactions. Crawl a Single-Page Application and generate pre-rendered content. Generate screenshots and PDFs of web pages. In fact, according to the official documentation on Github Puppeteer can be used to: Web scraping is just one of the several applications that makes Puppeteer shine. In this tutorial we are going to create a web scraper using Puppeteer, a Node library developed by Google to perform several automated tasks using the Chromium engine. Although it can be done manually, nowadays there are several developer-friendly tools that can automate the process for you. Web scraping is the process of extracting meaningful data from websites.
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