How to join two JSON Array objects in Node

Question

How to join two JSON Array objects in Node.

I want to join obj1 + obj2 so I can get the new JSON object:

obj1 = [ { t: 1, d: 'AAA', v: 'yes' },
         { t: 2, d: 'BBB', v: 'yes' }]

obj2 = [ { t: 3, d: 'CCC', v: 'yes' },
        { t: 4, d: 'DDD', v: 'yes' }]


output = [ { t: 1, d: 'AAA', v: 'yes' },
           { t: 2, d: 'BBB', v: 'yes' },
           { t: 3, d: 'CCC', v: 'yes' },
           { t: 4, d: 'DDD', v: 'yes' }]

Does this answer your question? Merge two json/javascript arrays in to one array — Vega
– Vega, Commented Jun 10, 2020 at 16:04

therobinkim · Accepted Answer · 2016-12-20 20:00:42Z

10

var output = obj1.concat(obj2);

edited Dec 20, 2016 at 20:00

answered Dec 20, 2016 at 3:26

therobinkim

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6 Comments

therobinkim Over a year ago

@coriano35 You need to provide more information. What does "not working" mean? Are you given an error? Or does your var output look nothing like what you expected?

therobinkim Over a year ago

@coriano35 Great, we're a step closer! What is obj1? Where is it defined? Feel free to edit your original question to tell us how obj1 really gets its value.

coriano35 Over a year ago

the obj1 value come from a url data with a format like this: <DTYYYYMMDD>,<OPEN>,<HIGH>,<LOW>,<CLOSE>,<VOL> 19840105,10.5435,10.6522,10.5435,10.6522,2300 19840106,10.6522,10.7609,10.6522,10.7609,36572 19840109,10.7609,10.7609,10.7609,10.7609,2992 19840110,10.8696,10.9783,10.8696,10.9783,127648 19840111,11.0869,11.0869,11.0869,11.0869,26912 19840112,11.0869,11.4131,11.0869,11.4131,21620

coriano35 Over a year ago

and parse by a function: var result = { d: [], t: [], c: [], v: [] }; var lines = data.split('\n'); for (var i = 1; i < lines.length - 1; i++) { var items = lines[i].split(","); result.d.push(items[0]); result.t.push(items[1]); result.c.push(parseFloat(items[2])); result.v.push(parseFloat(items[3])); }

coriano35 Over a year ago

and put it in a json object

|

Vaghani Janak · Accepted Answer · 2016-12-23 09:55:14Z

8

obj1 = [ { t: 1, d: 'AAA', v: 'yes' },
         { t: 2, d: 'BBB', v: 'yes' }]

obj2 = [ { t: 3, d: 'CCC', v: 'yes' },
        { t: 4, d: 'DDD', v: 'yes' }]

var output = obj1.concat(obj2);

console.log(output);

answered Dec 23, 2016 at 9:55

Vaghani Janak

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Comments

User · Accepted Answer · 2016-12-20 03:57:35Z

6

try

  Object.assign(obj1, obj2);

For Details check Here

 var o1 = { a: 1 };
 var o2 = { b: 2 };
 var o3 = { c: 3 };

 var obj = Object.assign(o1, o2, o3);
 console.log(obj); // { a: 1, b: 2, c: 3 }

answered Dec 20, 2016 at 3:57

User

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Comments

Evert · Accepted Answer · 2021-01-12 16:50:44Z

2

It can be done easily using ES6,

const output = [...obj1, ...obj2];

edited Jan 12, 2021 at 16:50

Evert

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answered Jan 12, 2021 at 16:46

Amit Verma

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1 Comment

Evert Over a year ago

This is the right answer. The others are pretty ridiculous in comparison!

coDe murDerer · Accepted Answer · 2019-06-11 09:54:51Z

i already got an answer from the link provided by Pravin

var merge = function() {
var destination = {},
    sources = [].slice.call( arguments, 0 );
sources.forEach(function( source ) {
    var prop;
    for ( prop in source ) {
        if ( prop in destination && Array.isArray( destination[ prop ] ) ) {

            // Concat Arrays
            destination[ prop ] = destination[ prop ].concat( source[ prop ] );

        } else if ( prop in destination && typeof destination[ prop ] === "object" ) {

            // Merge Objects
            destination[ prop ] = merge( destination[ prop ], source[ prop ] );

        } else {

            // Set new values
            destination[ prop ] = source[ prop ];

        }
    }
});
return destination;
};

console.log(JSON.stringify(merge({ a: { b: 1, c: 2 } }, { a: { b: 3, d: 4 } })));

Tegar Santosa · Accepted Answer · 2019-09-07 10:59:30Z

-1

you can use jmerge package.

npm i jmerge
const jm = require('jmerge')

jm(obj1,obj2,obj3,...) //merging json data

answered Sep 7, 2019 at 10:59

Tegar Santosa

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Comments

Adrian Mole · Accepted Answer · 2019-10-12 05:33:03Z

-2

I simply convert the arrays to strings, join them crudely with a comma, and then parse the result to JSON:

newJson=JSON.parse(
    JSON.stringify(copyJsonObj).substring(0,JSON.stringify(copyJsonObj).length-1) +
    ',' + 
    JSON.stringify(jsonObj).substring(1)
)

edited Oct 12, 2019 at 5:33

Adrian Mole

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answered Oct 12, 2019 at 5:12

Anurag Agarwal

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