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Mozilla JavaScript Shell

Command-line program included in the SpiderMonkey source distribution that functions as the JavaScript equivalent of Python's interactive prompt or Ruby's irb. Allows users to test JavaScript code snippets without reloading a web page.
Latest: 147.0.3
Last checked: Feb 27, 2026 8:45pm
Rank: 9028/15140
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Overview

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License: Mozilla Public License 2.0Installer: Binary archive (zip)Winget: Available

Version & Lifecycle

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Current: 147.0.3 Avg cadence: With Firefox releases

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

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Release Notes & Updates

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Also known as

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jsshellMozilla JavaScript Shell

Packaging Notes

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Available as jsshell-*.zip archives from Mozilla Firefox Nightly Builds. Also available via Chocolatey package manager.

Notes

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Can be run in interactive mode or with JavaScript program files. Supports various command-line options including -e for executing scripts, -f for running files, and -i for interactive mode.