how to merge object of multiple json into one json file using node.js

Question

I have multiple json files which just want to merge particular object from them and then save it into new json file: for example:

one.json
two.json
...

and each json file is like this:

one.json

{
  "passed": 1,
  "fixtures": [
    {
      "name": "Getting Started one",
      "path": "testOne.ts"
    }
  ]
}

two.json

{
  "passed": 1,
  "fixtures": [
    {
      "name": "Getting Started two",
      "path": "testTwo.ts"
    }
  ]
}

so my final json file should be like this:

final.json

{
    "passed": 2,
    "fixtures": [{
            "name": "Getting Started one",
            "path": "testOne.ts"
        },
        {
            "name": "Getting Started two",
            "path": "testTwo.ts"
        }
    ]
}

do you have an idea what is the simple way to merge like this.

node: json files is not just two but many so it is good to find every file which has a extension of json. it is good to do this in shell script or node.js.

thanks.

kgangadhar · Accepted Answer · 2019-08-19 22:08:01Z

7

Can do something like this using Promise:

const fs = require('fs');
const data = {
    "passed": 0,
    "fixtures": []
};
const dir = `${__dirname}/data/`;
fs.readdir(dir, (err, files) => {
    return new Promise((resolve, reject) => {
        if (err) reject(err);
        files.forEach(file => {
           console.log(file);
           let content = require(`${dir}${file}`);
           data['passed'] += content.passed;
           data['fixtures'] = data['fixtures'].concat(content['fixtures']);
        });
        resolve(data);
    }).then(data => {
        fs.writeFileSync('./final.json',JSON.stringify(data));
    });
})

Using Async/Await it can done like this:

const fs = require('fs');
const path = require('path');
const dir = path.join(__dirname, 'data');

let finalContent = { "fixtures": [], "passed": 0 };
const read_directory = async dir =>
    fs.readdirSync(dir).reduce((finalContent, file) => {
        filePath = path.join(dir, file);
        console.log(filePath);
        let content = require(filePath);
        finalContent.passed += content.passed;
        finalContent.fixtures = finalContent.fixtures.concat(content.fixtures);
        return finalContent;
    }, { "passed": 0, "fixtures": [] });

read_directory(dir).then(data => {
    fs.writeFileSync('./final.json', JSON.stringify(data));
});

edited Aug 19, 2019 at 22:08

answered Mar 10, 2018 at 12:30

kgangadhar

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2 Comments

jack Over a year ago

thanks for your great solution, i have revised the question, actually i have adding another object into each json which is not array, but number , and in a final json it should be the sum of all number, do have solution for this situation. thanks

kgangadhar Over a year ago

Updated, have a look

Praloy Das · Accepted Answer · 2018-03-10 11:52:33Z

0

First, deserialize the JSON into the object and put all the objects into a list and then serialize the list object to JSON.

answered Mar 10, 2018 at 11:52

Praloy Das

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Comments

Sviat Kuzhelev · Accepted Answer · 2018-03-10 12:35:22Z

-1

Actually, if you want to do it by node.js, you can use one of the node packages, that will make it for you very easy. For example, it's a good merge json package - https://www.npmjs.com/package/package-merge

answered Mar 10, 2018 at 12:35

Sviat Kuzhelev

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