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crawler4nodejs
Advanced tools
Crawler4nodejs is an open source web crawler for Node.js which provides a simple interface for crawling the Web.
Readme
Crawler4nodejs is an open source web crawler for Node.js which provides a simple interface for crawling the Web.
npm install crawler4nodejs
"scripts": {
"start": "node -r esm index.js"
}
npm install
You need to create a crawler class that extends Crawler. This class can override the _process_data()
function.
import Crawler from "crawler4nodejs"
const Cheerio = require('cheerio')
export default class ACrawler extends Crawler{
_process_data(url,html){
if (html && url){
const $ = Cheerio.load(html)
this.fs.appendFileSync("url.txt", url +"\n" , () => { })
let title = $(this.config.data_selector.title).text();
if (title)
this.fs.appendFileSync("test.txt", url + "\n" + title+ "\n",()=>{})
}
}
// process error url
_store_err_url(url){
this.fs.appendFileSync("error.txt", url + "\n", () => { })
}
}
let tuoi_tre_config = {
name: 'thanhnien_vn',
origin_url: 'https://thanhnien.vn',
should_visit_prefix: [ 'https://thanhnien.vn' ],
page_data_prefix: [ 'https://thanhnien.vn' ],
should_visit_pattern: '',
page_data_pattern: '',
max_depth: '0',
time_delay: '0',
content_selector: [
{ name: 'title', selector: '#storybox > h1' },
{
name: 'title',
selector: '#chapeau > div,.l-content .details__content'
}
],
proxyl: { host: '', port: '0', auth: { username: '', password: '' } }
};
let crawler = new ACrawler(tuoi_tre_config);
crawler.start();
By default there is no limit on the depth of crawling. But you can limit the depth of crawling. For example, assume that you have a seed page "A", which links to "B", which links to "C", which links to "D". So, we have the following link structure:
A -> B -> C -> D
Since, "A" is a seed page, it will have a depth of 0. "B" will have depth of 1 and so on. You can set a limit on the depth of pages that crawler4j crawls. For example, if you set this limit to 2, it won't crawl page "D". To set the maximum depth you can use:
let config = {
...
max_depth:3
};
let crawler = new ACrawler(config, logger);
Copyright (c) 2019 HongLM
FAQs
Crawler4nodejs is an open source web crawler for Node.js which provides a simple interface for crawling the Web.
The npm package crawler4nodejs receives a total of 10 weekly downloads. As such, crawler4nodejs popularity was classified as not popular.
We found that crawler4nodejs demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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