Add new property to JSON file key using NodeJS

Question

Sorry, I'm still new to programming, so please pardon me, I need help adding a new property inside a JSON file. :(

I want it to edit the JSON file~! meow~

animals.json: (Before Adding New Property)

{
  "cat": {
    "name": "Hiro",
    "age": 6
  },
  "wolf": {
    "name": "Kairo",
    "age": 3
  }
}

index.js (Example Code to add new Property)

var file = require('../../data/animals.json');

file["wolf"].push({gender: "female"})

the new animals.json after running index.js

{
  "cat": {
    "name": "Hiro",
    "age": 6
  },
  "wolf": {
    "name": "Kairo",
    "age": 3,
    "gender": "female"
  }
}

Is this possible? And if so, how? Thank you!

Ashish Modi · Accepted Answer · 2020-01-04 17:12:02Z

1

this should work

var file = require('../../data/animals.json');
const fs = require("fs");

file.wolf.gender = "female";

fs.writeFileSync("../../data/animals.json", JSON.stringify(file));

Using dot notation, you can either create or update property on a non null property.

edited Jan 4, 2020 at 17:12

answered Jan 4, 2020 at 16:03

Ashish Modi

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1 Comment

Ashish Modi Over a year ago

can you update your question to add this requirement? you need to use fs to overwrite the json file. let me see if I can update my answer.

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