# JavaScript Playground ⚡ Online JS Compiler

> \*\*Write and run JavaScript code instantly.\*\* Skip the setup and open a distraction-free playground with a single click. Test functions, debug concepts, or learn new features right in a dedicated popup. just pure, instant JS code execution.

Canonical page: [https://chrome-stats.com/d/javascript-compiler](https://chrome-stats.com/d/javascript-compiler)

## Overview

- **ID:** `javascript-compiler`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** onyxwizard
- **Category:** web-development
- **Daily users:** 31
- **Version:** 1.1
- **Last updated:** 2026-02-16
- **First published:** 2026-02-12
- **Size:** 95 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/javascript-compiler/)
- **Website:** [https://github.com/onyxwizard/live-js-compiler](https://github.com/onyxwizard/live-js-compiler)

## Description

A lightweight, cyber‑themed JavaScript playground that lives in your browser. Click the toolbar icon → a new tab opens with a side‑by‑side editor and output panel.

✅ Features:
• Real‑time evaluation – auto‑runs as you type (toggle on/off)
• Manual run via button or Ctrl+Enter
• Full JavaScript syntax highlighting (CodeMirror with Darcula theme)
• Console.log capture – shows output in the right panel
• Error display with clear visual feedback
• Persistent storage – your code is saved automatically
• Clean, responsive dark cyber design

No tracking, no data collection, no external servers – everything runs locally in your browser.

## Rankings

- #20,199 — Overall
- #25 — javascript
- #94 — script
- #125 — online
- #169 — setup

## Permissions and access

### Permissions

- `storage`
- `tabs`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/javascript-compiler)