Append objects to a json file

Question

I have a task to implement a pseudo cart page and when I click on checkout i want to send a request to a json file "ordersTest.json" with a following structure: { "orders": [] }. So when a post request is sent i have to put the data in that orders array in the json. I am completely new to Nodejs and express. This is my first project on it and i came up with a very simple server.

const express = require('express')
const path = require('path')
const fs = require('fs')
const url = require('url')
const bodyParser = require('body-parser')
const app = express()
const ordersJson = require('./public/ordersTest.json');


app.use(bodyParser.json());       
app.use(bodyParser.urlencoded({    
   extended: true
})); 
app.post('/api/orders', (req, res) => {
    let body = req.body;
    console.log(body);
    fs.appendFile('./public/ordersTest.json', JSON.stringify(body), err => {
        if (err) console.log(err);
    })
})

But this thing only appends it to the end of the file. I need to put it inside this orders array

This is my ajax passing an example object in the body of the post:

$(".btn-checkout").on('click', function() {
    let date = new Date();
    $.ajax({
        method : "POST",
        url: "/api/orders",
        data : {a: "abc"},//{ order: "order",date: date.toDateString(), order: JSON.stringify(cart)},
        success : function(success){
            console.log(success,'success');
        },
        error : function(err) {
            console.log(err);
        }
    });
    clearCart();
    displayClearedCart();
});

Vipin Kumar · Accepted Answer · 2017-12-07 09:34:24Z

2

You need to parse the JSON file and then treat it like an object. Once you are done with it, convert it to JSON again and overwrite your file. like this

app.post('/api/orders', (req, res) => {
    let body = req.body;
    var ordersTest = require('./public/ordersTest.json');
    ordersTest.orders.push(body);
    fs.writeFile('./public/ordersTest.json', JSON.stringify(ordersTest), function(err) {
      if (err) res.sendStatus(500)
      res.sendStatus(200);
    });
})

Not tested, please fix typo error if any.

answered Dec 7, 2017 at 9:34

Vipin Kumar

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1 Comment

Kristian Kamenov Over a year ago

Thank you! Worked perfectly

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