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readl

Read a file line-by-line in node.js

Install

You can install the latest version of the package using npm:

$ npm install --save readl

Usage

//Import dependencies
var readl = require('readl');
 
//File content
var content = '';
 
//Read the file
readl('file.txt', { encoding: 'utf8', start: 0 }, function(line)
{
  //Save the file content
  content = content + line + '\n';
});
 
//Show the file content
console.log(content);

API

readl(file, options, callback)

Execute the callback function one time for each line on the file.

file

A string with the path to the file.

options

An object with the following options:

• encoding: set the encoding. Default: utf8.
• emptyLines: set it to false if you want to omit the empty lines. Default: true.
• start: start position. Default is 0.
• chunk: set the chunk size. Default is 1024.
• endl: set the end-line character. Default is 0x0a.

callback

A function that will be executed one time for each read line on the file. This function will pass the following arguments:

• line: a string with the read line.
• index: an integer with the line number. The line counter starts in 1.
• position_start: an integer with the start position of the line in the file.
• position_end: an integer with the end position of the line in the file.
• length: an integer with the number of bytes read.

You can break the loop at a particular line by making the callback function return false.

Related

• readl-async: asynchronous version of this module.

License

MIT © Josemi Juanes.