Frontend Development 9 min read

An Introduction to Xterm.js: Features, Installation, and Usage

Xterm.js is a TypeScript‑based front‑end terminal component that provides fast, GPU‑accelerated, Unicode‑rich, self‑contained terminal emulation for web applications, with detailed installation steps, ES6 imports, plugin architecture, browser and Node.js support, and extensive real‑world usage examples.

IT Services Circle

Aug 3, 2022

Introduction

Xterm.js is a front‑end terminal component written in TypeScript, used by popular projects such as VS Code, Hyper, and Theia to provide full‑featured terminal experiences inside the browser.

Features

Terminal application compatibility: works with most terminal programs like bash , vim and tmux , supporting curses‑based apps and mouse events.

Performance: very fast with a GPU‑accelerated renderer.

Unicode support: full CJK, emoji, and IME handling.

Self‑contained: runs without external dependencies.

Accessibility: screen‑reader and low‑contrast mode support.

Extensibility: rich API, themes, plugins, and documentation.

What Xterm.js Is Not

It is not a standalone terminal application you can download, nor is it a replacement for bash ; instead it connects to processes to provide input/output.

Getting Started

Install the package via npm:

npm install xterm

Include xterm.js and xterm.css in the HTML head, add a container element, and instantiate the terminal:

<!doctype html>
<html>
  <head>
    <link rel="stylesheet" href="node_modules/xterm/css/xterm.css"/>
    <script src="node_modules/xterm/lib/xterm.js"></script>
  </head>
  <body>
    <div id="terminal"></div>
    <script>
      var term = new Terminal();
      term.open(document.getElementById('terminal'));
      term.write('Hello from \x1B[1;3;31mxterm.js\x1B[0m $ ');
    </script>
  </body>
</html>

ES6 Import

import { Terminal } from 'xterm';

Plugins

Since v3.14.0 Xterm.js uses a new addon format. Install an addon via npm and load it:

npm i -S xterm-addon-web-links

import { Terminal } from 'xterm';
import { WebLinksAddon } from 'xterm-addon-web-links';
const terminal = new Terminal();
terminal.loadAddon(new WebLinksAddon());

Official addons include xterm-addon-attach , xterm-addon-fit , xterm-addon-search , and xterm-addon-web-links .

Browser Support

Supported on modern browsers (latest Chrome, Edge, Firefox, Safari) and partially on IE 11; works seamlessly in Electron and early‑stage browsers.

Node.js Support

A headless version xterm-headless runs in Node.js for process tracking and state restoration.

API

The full API is defined in TypeScript declaration files; some APIs are marked experimental and may change between releases.

Real‑World Usage

Used in applications such as SourceLair, Microsoft VS Code, ttyd, Katacoda, Eclipse Che, WebSSH2, Codenvy, CoderPad, Terminal for Atom, Spyder Terminal, and many others.

Release Cycle

Releases follow a roughly monthly cadence; changelogs, roadmap, and milestones are available on the GitHub releases page, wiki, and milestones sections.

Beta Versions

Install the latest beta with:

npm install -S xterm@beta

Beta builds are generally stable and useful for testing new features.

References

See the linked GitHub README, addon repositories, TypeScript typings, and official documentation for detailed information.

frontend TypeScript JavaScript browser npm xterm.js web terminal

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