progress

What is progress?

The 'progress' npm package is used to create a flexible text progress bar in the console. It is useful for tracking the progress of an operation in command-line applications.

What are progress's main functionalities?

Basic Progress Bar

This code sample demonstrates how to create a simple progress bar that updates every 100 milliseconds until it's complete.

const ProgressBar = require('progress');

let bar = new ProgressBar(':bar', { total: 10 });
let timer = setInterval(() => {
  bar.tick();
  if (bar.complete) {
    console.log('\nComplete!');
    clearInterval(timer);
  }
}, 100);

Custom Tokens

This code sample shows how to use custom tokens within the progress bar format to display additional information.

const ProgressBar = require('progress');

let bar = new ProgressBar(':current/:total (:percent) :bar :custom', { total: 20, width: 30 });
bar.tick({ custom: 'Token' });

Increment with Step

This code sample illustrates how to increment the progress bar by a step greater than one.

const ProgressBar = require('progress');

let bar = new ProgressBar(':bar', { total: 10 });
bar.tick(2);

Other packages similar to progress

cli-progress

cli-progress is a full-featured progress bar for Node.js command line applications. It offers more customization options than 'progress', such as multiple bars, custom bar characters, and payload handling.

nanobar

nanobar is a very lightweight progress bar without jQuery. While it is not directly comparable to 'progress' since it's for browser use, it serves a similar purpose in providing visual feedback for progress in a minimalistic way.

node-progress-bars

node-progress-bars is another alternative to 'progress' that allows for multiple simultaneous progress bars in the terminal. It provides a different API and additional features like color support.

README

node-progress

Flexible ascii progress bar

Usage

First we create a ProgressBar, giving it a format string as well as the total, telling the progress bar when it will be considered complete. After that all we need to do is tick() appropriately.

   var ProgressBar = require('progress');

   var bar = new ProgressBar(':bar', { total: 10 });
   var timer = setInterval(function(){
     bar.tick();
     if (bar.complete) {
       console.log('\ncomplete\n');
       clearInterval(timer);
     }
   }, 100);

Options:

• total total number of ticks to complete
• stream the output stream defaulting to stdout
• complete completion character defaulting to "="
• incomplete incomplete character defaulting to "-"

Tokens:

• :bar the progress bar itself
• :current current tick number
• :total total ticks
• :elapsed time elapsed in seconds
• :percent completion percentage
• :eta estimated completion time in seconds

Examples

Download

In our download example each tick has a variable influence, so we pass the chunk length which adjusts the progress bar appropriately relative to the total length.

  var ProgressBar = require('../')
    , https = require('https');

  var req = https.request({
      host: 'download.github.com'
    , port: 443
    , path: '/visionmedia-node-jscoverage-0d4608a.zip'
  });

  req.on('response', function(res){
    var len = parseInt(res.headers['content-length'], 10);

    console.log();
    var bar = new ProgressBar('  downloading [:bar] :percent :etas', {
        complete: '='
      , incomplete: ' '
      , width: 20
      , total: len
    });

    res.on('data', function(chunk){
      bar.tick(chunk.length);
    });

    res.on('end', function(){
      console.log('\n');
    });
  });

  req.end();

The code above will generate a progress bar that looks like this:

  downloading [=====             ] 29% 3.7s

License

(The MIT License)

Copyright (c) 2011 TJ Holowaychuk <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.