#technology #reference-sheet #cheat-sheet #nodejs

idea

This is a reference sheet on NodeJS

Networking

Making requests:

const https = require('https')

const options = {
  hostname: 'encrypted.google.com',
  port: 443,
  path: '/',
  method: 'GET'
}

const req = https.request(options, (res) => {
  console.log('statusCode:', res.statusCode)
  console.log('headers:', res.headers)

  res.on('data', (d) => {
    process.stdout.write(d)
  })
  res.on('end', () => {
    // finished receiving data
  })
})

req.on('error', (e) => {
  console.error(e)
});

// For POST:
//
// req.write(data)

req.end()

Using fetch (npm install --save node-fetch)

const fetch = require("node-fetch")

fetch("url", {
  headers: {

  },
  "method": "GET",
  "body": null,
  // "referrer": "",
  // "referrerPolicy": "strict-origin-when-cross-origin",
  // "mode": "cors"
})

Parsing urls^[1]:

const url = require('url')
// Assuming a request object
// Assuming url http://localhost:8080/app.js?foo=bad&baz=foo
const queryObject = url.parse(req.url,true)
url.parse(req.url,true).query // { foo: 'bad', baz: 'foo' }
url.parse(req.url,true).host // 'localhost:8080'
url.parse(req.url,true).pathname // '/app.js'
url.parse(req.url,true).search // '?foo=bad&baz=foo'

Simple server:

const http = require('http');

const server = http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end("It woerks.");
});
server.listen();

Watch

Use npm-watch [^3]

npm install npm-watch --save-dev

In package.json:

  "watch": {
    "test": {
      "patterns": [
        "src",
        "test"
      ],
      "extensions": "js"
    }
  },
  //...
  "scripts": {
      //...
      "watch": "npm-watch",
      //...
  }

links

references

[1]: Nodejs / Access query string parameters

[2]: NodeJs /Https - request

[3]: Plaf