Read multiple json files into an array of objects in JavaScript

Question

I have multiple json files under a folder that I need to read. The data file path is like:

./data/json1.json
./data/json2.json

My initializer class works as below:

const j1 = require('./data/json1.json');
const j2 = require('./data/json2.json');
init(){
    return j1.concat(j2);
}

Is there a better way to do this as the list of files under data could increase and every time this would require modifications?

I would preferably avoid a solution with looping in the folder and read file to append in an array object in init().

vsemozhebuty · Accepted Answer · 2019-02-10 14:36:51Z

6

As a variant:

'use strict';

const fs = require('fs');
const path = require('path');

const dir = './data';

function init() {
  return fs.readdirSync(dir)
           .filter(name => path.extname(name) === '.json')
           .map(name => require(path.join(dir, name)));
}

answered Feb 10, 2019 at 14:36

vsemozhebuty

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2 Comments

infamous hvher Over a year ago

Is there any alternative for the client-side? (I am trying to use this for typescript client-side) IS there any alternative?

vsemozhebuty Over a year ago

@infamoushvher I think this is worth a separate question.

sveyda · Accepted Answer · 2020-10-25 16:37:53Z

-1

You can use glob package.

const glob = require("glob");
const path = require("path");

glob('data/*.json', function (er, files) {
  files.forEach(function(file) {
    //Do your thing
  })
})

edited Oct 25, 2020 at 16:37

answered Feb 10, 2019 at 9:58

sveyda

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3 Comments

Abhi Nandan Over a year ago

where are we using glob here? it's normal file read, that I would preferably avoid.

sveyda Over a year ago

If you don't want to modificate your code again get the paths with the glob.

mcmxc Over a year ago

path.join returns a string, with no forEach method. and the asterisk is also not working

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