how to check how many lines of code in file using node js

Question

I tried to read line by line in file, but I have a doubt how to print count of line in file using nodejs.

data.js

console.log("123")

console.log("123")


console.log("123")



console.log("123")

file.js

var lineReader = require('readline').createInterface({
  input: require('fs').createReadStream('./data.js')
});
lineReader.on('line', function (line) {
  console.log('Line from file:', line);
});

I got this ouput

Line from file: console.log("123") Line from file:
Line from file: console.log("123") Line from file:
Line from file: Line from file: console.log("123") Line from file: Line from file: Line from file: Line from file: console.log("123")

but I want how many lines of code in file using node js

https://stackoverflow.com/questions/12453057/node-js-count-the-number-of-lines-in-a-file This can help you — abby37, May 14 '19 at 05:35

score 4 · Answer 1 · answered May 14 '19 at 07:19

4

const fs = require('fs')

fs.readFile('source', 'utf8', (err, data) => {
    console.log(data.split('\n').length)
})

First of all import fs library, then, read file and get length by splitting data

answered May 14 '19 at 07:19

Müslüm ÇOBAN

91
3

score 3 · Accepted Answer · answered May 14 '19 at 05:35

3

var i;
var count = 0;
require('fs').createReadStream(process.argv[2])
  .on('data', function(chunk) {
    for (i=0; i < chunk.length; ++i)
      if (chunk[i] == 10) count++;
  })
  .on('end', function() {
    console.log(count);
  });

answered May 14 '19 at 05:35

Nam V. Do

630
6
27

1

Please add a brief explanation about your answer. – Krishna Prashatt May 14 '19 at 05:49

score 2 · Answer 3 · answered May 14 '19 at 05:48

let count = 0;
var lineReader = require('readline').createInterface({
   input: require('fs').createReadStream('./data.js')
});
lineReader.on('data', line => {
   for (i=0; i < line.length; ++i) if (line[i] == 10) count++;
})
.on('end', () => {
   console.log(count);
})

By looping the lines in file you count the number of lines this way. Also you can checkout this link for more details

how to check how many lines of code in file using node js

3 Answers3