No lines read from text file when using 'readline' for node.js

Question

I have a Node app in a directory together with a text file called sample.csv.

I'm trying to read the file line-by-line with the following code, but nothing gets read:

var readline = require('readline');
var fs = require('fs');    

var lineReader = readline.createInterface({
   input: fs.createReadStream('sample.csv')
});

lineReader.on('line', function (line) {
    console.log(line); // Never happens
});

console.log('Completed.'); // Immediately skips to this

Any bright ideas? :) Thanks!

Check the example from npm readline page

Max
– Max

2016-04-06 08:07:24 +00:00
Commented Apr 6, 2016 at 8:07 — Max
– Max, Commented Apr 6, 2016 at 8:07
Thanks for the tip, @Max!

Ted Nyberg
– Ted Nyberg

2016-04-06 08:13:39 +00:00
Commented Apr 6, 2016 at 8:13 — Ted Nyberg
– Ted Nyberg, Commented Apr 6, 2016 at 8:13

Zeeshan Hassan Memon · Accepted Answer · 2016-04-06 08:04:45Z

3

Try this:

var readline = require('linebyline'),
        rl = readline('./sample.csv');
    rl.on('line', function (line, lineCount, byteCount) {
        console.log(lineCount, line, byteCount);
        // do something with the line of text
    })
    .on('error', function (e) {
            console.log("error", e);
        // something went wrong
    });

Node Cheat Available at line_by_line.

answered Apr 6, 2016 at 8:04

Zeeshan Hassan Memon

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2 Comments

Ted Nyberg Over a year ago

Nevermind, I'm an idiot. I had a `process.exit()´ immediately after hooking up to the 'line' event... :( I'm guessing my original code probably would've worked, but regardless it seems 'linebyline' is the better option. Thanks again!

Zeeshan Hassan Memon Over a year ago

make sure file contains some csv content and it is in same dir, because I have just tested and added sample csv file in node-cheat link. If needed you can try that too. My sample sample_csv.csv

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