Merge two JSON Object in Node .js

Question

I have two json object and i want to merge it. it means ifsame key is there then want to overwrite it. How I can do it using node.js. kindly check below sample:

first object

{
"title": "Test",
"url": "/test",
"gf": {
    "name": "kim",
    "last": "john"
},
"created_at": "2021-09-08T18:40:50.152Z",
"updated_at": "2021-09-08T18:54:36.387Z",
"version": 9
}

Second Object

{
"gf": {
    "last": "Anup"
},
"__originalParams": {
    "gf": {
        "last": "Anup"
    }
}
}

Required Result

{
"title": "Test",
"url": "/test",
"gf": {
    "name": "kim",
    "last": "Anup"
},
"created_at": "2021-09-08T18:40:50.152Z",
"updated_at": "2021-09-08T18:54:36.387Z",
"version": 9,
"__originalParams": {
    "gf": {
        "last": "Anup"
    }
}
}

How I get this result using node.js . It is just a sample I have complex JSON structure too. is any direct option present in Lodash or Ramda for this. Kindly help me here

Does this answer your question? How to deep merge instead of shallow merge? — num8er
– num8er, Commented Sep 8, 2021 at 19:35

Vishnu Vinod · Accepted Answer · 2021-09-08 19:19:09Z

2

You can use the JavaScript's Spread operator for this purpose. You can try,

let obj1 = {
    key: 'value'
    ...
}
let obj2 = {
    key: 'value'
    ...
}
console.log({ ...obj1, ...obj2 })

You will get the desired output by replacing the values of obj 1 by values of obj2

answered Sep 8, 2021 at 19:19

Vishnu Vinod

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Comments

LeeLenalee · Accepted Answer · 2021-09-08 19:23:15Z

1

You can use Object.assign:

let obj1 = {
"gf": {
    "last": "Anup"
},
"__originalParams": {
    "gf": {
        "last": "Anup"
    }
}
};

let obj2 = {
"title": "Test",
"url": "/test",
"gf": {
    "name": "kim",
    "last": "john"
},
"created_at": "2021-09-08T18:40:50.152Z",
"updated_at": "2021-09-08T18:54:36.387Z",
"version": 9
};

let merged = Object.assign({}, obj1, obj2);

console.log(merged)

answered Sep 8, 2021 at 19:23

LeeLenalee

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2 Comments

LeeLenalee Over a year ago

samanthaming.com/tidbits/70-3-ways-to-clone-objects/…, measurethat.net/Benchmarks/Show/2136/0/…, gist.github.com/syaau/e9b991e55aed8c249fa5a86511f77ca5, measurethat.net/Benchmarks/Show/9596/0/…

Timur Over a year ago

This answer doesn't give the desired result. The OP's required result indicates gf.last on first object ("john") should be replaced by the second object's gf.last property ("Anup") so that result gf.last should be "Anup", not "john"

Timur · Accepted Answer · 2021-09-08 19:41:32Z

You can use lodash merge or the deepmerge package:

var lhs = {
  "title": "Test",
  "url": "/test",
  "gf": {
    "name": "kim",
    "last": "john"
  },
  "created_at": "2021-09-08T18:40:50.152Z",
  "updated_at": "2021-09-08T18:54:36.387Z",
  "version": 9
};

var rhs = {
  "gf": {
    "last": "Anup"
  },
  "__originalParams": {
    "gf": {
      "last": "Anup"
    }
  }
}

var ans = deepmerge(lhs, rhs)
var ans2 = _.merge(lhs, rhs)

console.log(ans)
console.log(ans2)

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
<script src="https://unpkg.com/[email protected]/dist/umd.js"></script>

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