javascript read text file line by line

javascript read text file line by line: Using simple javascript, We want to open a simple text file, read it line by line example with demo.

javascript read text file line by line

In this best tutorial, you will learn how to read text file in javascript line by line.

Read File Line by Line in JavaScript

Example
Use Plain JavaScript to Read a Local File Line by Line in JavaScript

<input type="file" name="myfl" id="myfl" />

document.getElementById('myfl').onchange = function(){
  var myfl = this.files[0];
  var reader = new FileReader();
  reader.onload = function(progressEvent){
    console.log(this.result);
  };
  reader.readAsText(myfl);
};

How to read a local text file using JavaScript?

using FileReader.readAsText() method to read local .txt file.

<!DOCTYPE html>
<html>

<head>
	<title>Read Text File - www.pakainfo.com</title>
</head>

<body>
	<input type="file" name="welcomefl"
			id="welcomefl">
	<br>

	<pre id="results"></pre>
	
	<script type="text/javascript">
		document.getElementById('welcomefl')
			.addEventListener('change', function() {
			
			var fl=new FileReader();
			fl.onload=function(){
				document.getElementById('results')
						.textContent=fl.result;
			}
			
			fl.readAsText(this.files[0]);
		})
	</script>
</body>

</html>

Don’t Miss : https://www.pakainfo.com/how-to-read-text-file-in-javascript-line-by-line/

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javascript read text file line by line

Reading all the data content of a file using the line-reader module is easy as it supports the eachLine() method.
Pure JavaScript:

document.getElementById('fl').onchange = function(){

  var fl = this.files[0];

  var reader = new FileReader();
  reader.onload = function(progressEvent){
    // Entire file
    console.log(this.result);

    // By allrows
    var allrows = this.result.split('\n');
    for(var row = 0; row < allrows.length; row++){
      console.log(allrows[row]);
    }
  };
  reader.readAsText(fl);
};

<input type="file" name="fl" id="fl">

Using ES6 Example

handleFiles(input) {

    const fl = input.target.files[0];
    const reader = new FileReader();

    reader.onload = (event) => {
        const fl = event.target.result;
        const allLines = fl.split(/\r\n|\n/);
        // Reading line by line
        allLines.forEach((line) => {
            console.log(line);
        });
    };

    reader.onerror = (event) => {
        alert(event.target.error.name);
    };

    reader.readAsText(fl);
}

How to read a file line by line using node.js ?

Example

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

const fl = readline.createInterface({
	input: fs.createReadStream('pakainfo_dco.txt'),
	output: process.stdout,
	terminal: false
});

fl.on('line', (line) => {
	console.log(line);
});

node.js read text file line by line
get lines as list from file node js

const fs = require('fs');

fs.readFile('welcome.txt', function(err, data) {
    if(err) throw err;

    const websites = data.toString().replace(/\r\n/g,'\n').split('\n');

    for(let w of websites) {
        console.log(w);
    }
});

This video learn you to read a file from the user’s file system using JavaScript Example.

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