Add object to JSON with Node.js

I have a JSON file that I need to use as a database to add, remove and modify users, I have this code:

'use strict';

const fs = require('fs');

let student =
id: 15,
nombre: 'TestNombre',
apellido: 'TestApellido',
email: 'TestEmail@gmail.com',
confirmado: true
;


let data = JSON.stringify(student, null, 2);
fs.writeFileSync('personas.json', data);


But that overwrites the JSON file, and I need to append as another object, so it continues with id 15 (last one was 14).

Here is a piece of the JSON file:


"personas": [

"id": 0,
"nombre": "Aurelia",
"apellido": "Osborn",
"email": "aureliaosborn@lovepad.com",
"confirmado": false
,

"id": 1,
"nombre": "Curry",
"apellido": "Jefferson",
"email": "curryjefferson@lovepad.com",
"confirmado": true
,
]



How can I do this?

2 Answers
2

Just require the file, push the student in the personas prop and
writeFileSync it back.

require

student

personas

writeFileSync

'use strict';

const fs = require('fs');

let current = require('./personas.json');
let student =
id: 15,
nombre: 'TestNombre',
apellido: 'TestApellido',
email: 'TestEmail@gmail.com',
confirmado: true
;

current.personas.push(student);

// Make sure you stringify it using 4 spaces of identation
// so it stays human-readable.
fs.writeFileSync('personas.json', JSON.stringify(current, null, 4));


fs. writeFileSync

every time you want to write to the JSON file, you’ll need to read it first/parse it, update he Object and then write it to disk.

There’s a popular solution already handling that. Checkout lowdb

For the autoindexing - I believe the documentation suggests ways some helper libraries for this module to make that happen

Don’t reinvent the wheel!

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