javascript - How can I read files from directory and send as JSON to client? - Stack Overflow

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I have logs files in server directory i wanted to display file names to client side so i have created readDirectory.js that is reading names correctly Now i am very new to node.js and i am trying to send json data to client but its not happening, How can i send log files name to client using express ?

readDirectory.js

var fs = require('fs');
var path = './Logs'
var Logs = [];
function readDirectory(){
    fs.readdir(path, function(err, items) {
        Logs.push(items);
       /* console.log(items);
        for (var i=0; i<items.length; i++) {
            console.log(items[i]);
        }*/

    });
 return Logs;
}
exports.readDirectory = readDirectory;

app.js

 var express = require('express');
    var app = express();
    var readDirectory = require('./readDirectory');
    app.use(express.static(__dirname + "/public"));

    app.get('/logs',function(req,res){
    res.send(readDirectory.readDirectory());
   });

angularFactory.js

angular.module('App').factory('DitFactory', function ($http) {
    'use strict';
    var data;
    return {
        data:"data from factory"
       getLogs: function () {
            return $http.get('/logs')
                .then(function (response) {
                    return response.data;
                });
        }
    }

});

I have logs files in server directory i wanted to display file names to client side so i have created readDirectory.js that is reading names correctly Now i am very new to node.js and i am trying to send json data to client but its not happening, How can i send log files name to client using express ?

readDirectory.js

var fs = require('fs');
var path = './Logs'
var Logs = [];
function readDirectory(){
    fs.readdir(path, function(err, items) {
        Logs.push(items);
       /* console.log(items);
        for (var i=0; i<items.length; i++) {
            console.log(items[i]);
        }*/

    });
 return Logs;
}
exports.readDirectory = readDirectory;

app.js

 var express = require('express');
    var app = express();
    var readDirectory = require('./readDirectory');
    app.use(express.static(__dirname + "/public"));

    app.get('/logs',function(req,res){
    res.send(readDirectory.readDirectory());
   });

angularFactory.js

angular.module('App').factory('DitFactory', function ($http) {
    'use strict';
    var data;
    return {
        data:"data from factory"
       getLogs: function () {
            return $http.get('/logs')
                .then(function (response) {
                    return response.data;
                });
        }
    }

});

• javascript
• angularjs
• json
• node.js

Share Follow edited Jun 29, 2016 at 18:07 hussain asked Jun 29, 2016 at 15:33 hussainhussain 7,1412121 gold badges8787 silver badges165165 bronze badges

Add a ment  | 

3 Answers 3

Sorted by: Reset to default 2

You have to put serialize the Logs array into json and send it back to client

app.get('/logs',function(req,res){
    res.setHeader('Content-Type', 'application/json');
    res.send(JSON.stringify(readDirectory.readDirectory()));
});

Or

app.get('/logs',function(req,res){
    res.json(readDirectory.readDirectory());
});

your readDirectory.js should look like this:

var fs = require('fs');
var path = './Logs'
var Logs = [];
function readDirectory(callback){
    fs.readdir(path, function(err, items) {
       Logs.push(items);
       callback(Logs);       
    }); 
}
exports.readDirectory = readDirectory;

and your app.js should be like this:

var express = require('express');
var app = express();
var readDirectory = require('./readDirectory');
app.use(express.static(__dirname + "/public"));

app.get('/logs',function(req,res){
    readDirectory.readDirectory(function(logFiles){
       res.json({files : logFiles});
   });
});

Hope this Help !

Since Node v11.0.0 you can use require('fs').promises to get promises.

In your case you are pushing the array of the files in the directory into "Logs" array. Since in this case "Logs" will always be an array with only one value, I didn't use it.

You can do it like this:

var fs = require('fs').promises;
var path = './Logs'
async function readDirectory() {
    const files = await fs.readdir(path);
    return files;
}

In order to return the list of files in the folder change your app.js like this:

app.get('/logs', function (req, res) {
    readDirectory.readDirectory()
        .then((files) => {
            res.send(files);
        });
});

Link for the full answer: https://stackoverflow./a/56821924/8021938

Source: https://nodejs/api/fs.html#fs_fspromises_readfile_path_options

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