Simple Node.js script to edit JSON files

JsonEditor.js

var fs = require('fs');

const inputPath = 'composer.json';
const outputPath = 'composer.json';
var composerfile;
fs.readFile(inputPath, 'utf8', function (err, data) {
    if (err) throw err;
    composerfile = JSON.parse(data);
    composerfile.config['vendor-dir'] = "./../path-to-vendor";
    // delete composerfile.config['vendor-dir'];
    fs.writeFileSync(outputPath, JSON.stringify(composerfile, null, 2) , 'utf-8'); 
});