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const fs = require("fs")

const addToJson = (id, name) => {
    let new_obj = {id: id, name: name}
    fs.readFile('new_json.json', 'utf8', function readFileCallback(err, data){
        if (err){
            console.log(err);
        } else {
        obj = JSON.parse(data); // now it's array of objects
        console.log(obj)
        obj.push(new_obj); //add new object to the array
        json = JSON.stringify(obj, null, 2); // convert it back to json
        fs.writeFile('new_json.json', json, 'utf8', function(err) {
            if (err) throw err;
            console.log('complete');
            });
    }});
}

addToJson(16, "test")