some small node / javascript snippets with very basic tasks

fetch-api.js

// 2022 - does no longer work

// node:  assume node-fetch is installed.
// alias node='export NODE_PATH=$NODE_PATH:$NVM_BIN/../lib/node_modules && node --use-strict'
// const fetch = require("node-fetch"); // load -g module 
(async () => {const data = await fetch("http://api.figshare.com/v1/categories", {
    "credentials": "include",
    "headers": {
        "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:79.0) Gecko/20100101 Firefox/79.0",
        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
        "Accept-Language": "en-US,en;q=0.5",
        "Upgrade-Insecure-Requests": "1",
        "Cache-Control": "max-age=0"
    },
    "referrer": "https://hckrnews.com/",
    "method": "GET",
    "mode": "cors"
});
const jsonData = await data.json();
console.log(jsonData);
//process.stdout.write(JSON.stringify(jsonData));
})();

node_snippets.js

// read in a small textfile asynchronously
// with nodejs
// assumes that you are in your Linux home directory
// and a simple textfile file '.wgetrc' exists

var fs = require("fs");
var infile = __dirname + "/.wgetrc";
var fn = function(error, contents){
  if(error){
    console.log(error);
    return;
  }
  console.log(contents)
} 

fs.readFile(infile, "utf8", fn);

previous snippet, on error, returns

{ [Error: ENOENT: no such file or directory, open '..Xauthority']
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '..Xauthority' }

on success returns the file contents, and keeps the file open