[nodejs] Filter keys from json with nodejs

Here is a example to filter the keys of json data.

// require fs library
const fs = require('fs');

// read json from file
const fileContent = fs.readFileSync('input.json', 'utf8');

// parse as array
const jsonArray = JSON.parse(fileContent);

// for each value from json array
// pick the id column only
var result = []
jsonArray.forEach(value => {
    var obj = {}
    obj['id'] = value['id'];
    result.push(obj);
});

// convert to json string and write to file
fs.writeFileSync('output.json', JSON.stringify(result));