How can I add a child node to an existing json file through node js?

Question

I am using ExpressJS to write my application and jsonfile (https://www.npmjs.com/package/jsonfile) to handle json files. I have this following json file:

{
  "news": [
    {
      "id": "1",
      "title": "News 1 heading",
      "description": "Lorem ipsum dolor sit amet upidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
      "dateposted": "00188292929"
    },
    {
      "id": "2",
      "title": "News 2 heading",
      "description": "Lorem ipsum dolor sit amet",
      "dateposted": "00188292929"
    }
  ]
}

Now, I want to add another set of news under the "news" node, so that my final json looks like this:

{
      "news": [
        {
          "id": "1",
          "title": "News 1 heading",
          "description": "Lorem ipsum dolor sit amet upidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
          "dateposted": "00188292929"
        },
        {
          "id": "2",
          "title": "News 2 heading",
          "description": "Lorem ipsum dolor sit amet",
          "dateposted": "00188292929"
        },
        {
          "id": "3",
          "title": "News 3 heading",
          "description": "Lorem ipsum dolor sit amet",
          "dateposted": "00188292929"
        }
      ]
    }

There is an append flag with jsonfile but it appends at the end of the file rather than under a given node. How can I append the data under and existing node? Do, I need to stringify the json, add data and JSONfy it? or there is a more direct way?

Thanks.

Samudra Deka · Accepted Answer · 2018-03-06 16:57:02Z

You can use Json PUSH to append a json object to a current node. The code would look like this:

var json={
      "news": [
        {
          "id": "1",
          "title": "News 1 heading",
          "description": "Lorem ipsum dolor sit amet upidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.",
          "dateposted": "00188292929"
        },
        {
          "id": "2",
          "title": "News 2 heading",
          "description": "Lorem ipsum dolor sit amet",
          "dateposted": "00188292929"
        },
        {
          "id": "3",
          "title": "News 3 heading",
          "description": "Lorem ipsum dolor sit amet",
          "dateposted": "00188292929"
        }
      ]
    };


    json.news.push({
          "id": "3",
          "title": "News 3 heading",
          "description": "Lorem ipsum dolor sit amet",
          "dateposted": "00188292929"
        });
   console.log(json);

Elliot Blackburn · Accepted Answer · 2018-03-06 10:52:48Z

0

Jsonfile's append option is referring to opening a file in append mode, in this mode you can only add to the end of the file.

You will need to re-write the entire file using the normal writeFile options. Effectively overwriting the original file.

You can see in the jsonfile code on line 91 (it is a short single file node module) that it simply passes the append flag through to fs.writeFile. I'm not entirely sure when you would use this in all honesty, but I'm assuming it's if you want to maybe output a bunch of documents and then append on some json at the bottom of each.

answered Mar 6, 2018 at 10:52

Elliot Blackburn

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