How to write JSON data and merge them together

[mizanmahi]

  {
    "userId": 1,
    "id": 1,
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
  },
 

{
    "userId": 1,
    "id": 3,
    "title": "ea molestias quasi exercitationem repellat qui ipsa sit aut",
    "body": "et iusto sed quo iure\nvoluptatem occaecati omnis eligendi aut ad\nvoluptatem doloribus vel accusantium quis pariatur\nmolestiae porro eius odio et labore et velit aut"
  }

I want to append both objects in a JSON file one by one and the format should be like this

[
 {
    "userId": 1,
    "id": 1,
    "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
    "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
  },
{
    "userId": 1,
    "id": 3,
    "title": "ea molestias quasi exercitationem repellat qui ipsa sit aut",
    "body": "et iusto sed quo iure\nvoluptatem occaecati omnis eligendi aut ad\nvoluptatem doloribus vel accusantium quis pariatur\nmolestiae porro eius odio et labore et velit aut"
  }
]

How can I get this functionality? Thanks!

[colinthornton]

Are you running this program on Node or the browser?

In Node you can call require with JSON files so:

const jsonOne = require('path/to/one.json');
const jsonTwo = require('path/to/two.json');

const combined = [
  jsonOne,
  jsonTwo,
];

[mizanmahi]

But I have almost 40,000 object and I want to do it programmatically one by one. What you are suggesting for that I have to first create the 40,000 JSON file and then require them all and then merge them together which is cumbersome .

[colinthornton]

That’s important information…

You have a single JSON file, with 40k objects, not in an array? So it’s a single giant object?

It’s hard to help without knowing what your data looks like. Is it in files? Are they coming from a fetch request?

[azraelvecchio]

You just have to use JSON.parse() on your data, push inside an array and use JSON.stringify() to convert to JSON again.

https://www.w3schools.com/js/js_json_parse.asp

Try to do It. If you can’t make It work, I’ll write the code for you.

[mizanmahi]

No, it’s not a single giant object. I am getting bellow data in every iteraton.

{"title":"C Squared Media","rating":null,"reviewCount":null,"profileSummary":"At C Squared Media, we help our clients thrive through a focus on the most intelligent solutions, effective communication & a commitment to professionalism every step of the way.  ","minProjSize":"Undisclosed","ratePerHour":"Undisclosed","foundingYear":"Founded 2014","location":"Thiensville, WI","focuses":[{"Advertising":"25%"},{"Marketing Strategy":"25%"},{"Pay Per Click":"25%"},{"Search Engine Optimization":"25%"}],"siteUrl":"https:\u002F\u002Fwww.csquaredmedia.com\u002F"}

I am getting this JSON data on every loop and I want to append it to the JSON file.

[mizanmahi]

For that every time i have to load the entire JSON file and convert them to merge that’s will not be efficient as for a single data I have to write the whole file again.

[azraelvecchio]

Well… That’s what functions are for. You’re going to make a function and call It inside your loop.

[colinthornton]

How are you iterating on the giant object? What are the smaller objects indexed by? An ID number or something?

Is the original data something like this:

{
  123: {
    "title": "some movie",
    "rating": 5
    // ...
  },
  456: {
    "title": "some other movie",
    "rating": 9.9
    // ...
  },
  // ...
}

And you want to change it into:

[
  {
    "title": "some movie",
    "rating": 5
    // ...
  },
  {
    "title": "some other movie",
    "rating": 9.9
    // ...
  },
  // ...
]