How to merge 2 json objects in javascript

Question

example: Below there are 2 json objects with different values and I want to make it as one final Json object and append new value to the final result

let json1= { "b":"test1", "a":"test3", "type":"sample1" }

let json2= { "b":{ "endDate":"ddd1", "startDate":"dd01" }, "a":{ "endDate":"31", "startDate":"01" }, "type":"sample2" }

Expected results should be like below

let result = { "b":{ "endDate":"ddd1", "startDate":"dd01", "XYZ":"test1" }, "a":{ "endDate":"31", "startDate":"01", "XYZ":"test3" }, }

Can anyone help please using JavaScript or loadash functionality

Answer 1

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Can be as simple as this:

 let Object1 ={"b":"test1","a":"test3","type":"sample1"};let Object2 ={"b":{"endDate":"ddd1","startDate":"dd01"},"a":{"endDate":"31","startDate":"01"},"type":"sample2"} let Object3 = Object2; for (let i in Object3){ Object3[i]["XYZ"] = Object1[i] } Object3["type"] = "12345" console.log(Object3)

Answer 2

You can use the rest operator to remove type property and then assign values from 1st object to new property of the merged object

let mergeObjects = (a, b) => {

    let {type, ...rest} = b; //remove type property
    for(let prop in rest){
        if(a[prop]){
            rest[prop].xyz = a[prop]; 
        }
    }
    return rest;
}

let Object3= mergeObjects(Object1, Object2);
console.log(Object3);