Creating JSON object using string

Question

Say I have this code in node.js:

var fs = require("fs");
var file_content = fs.readFileSync('file.json');
var json = JSON.parse(file_content);

let x = "c";
json.x = 3;
fs.writeFileSync("file.json", JSON.stringify(json));

and this JSON file:

{"a":1,"b":2}

I want to create json object "c" but this code would create "x". How would I create "c" this way?

JSON is string data. You don't create JSON objects, that's not a thing, you simply create a normal JS object, and then you turn _that_ into a JSON string. So just set a property called `c` in the exact same way you're currently setting a property called `x`. Done. — Mike 'Pomax' Kamermans, Mar 14 '20 at 18:53

score 0 · Answer 1 · answered Mar 14 '20 at 20:25

0

You want to set the property c of the object json. The synthax json.x corresponds to the property x. You need to use square brackets if you want the value of x as property.

let x = 'c';
json[x] = 3;

answered Mar 14 '20 at 20:25

L. Meyer

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Creating JSON object using string

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