RunJS is an JavaScript playground that auto-evaluates your code as you type and outputs the results to a console pane.
Publisher’s description
What is RunJS?
RunJS by Haas Labs Ltd is proprietary Windows software in the languages & sdks category.
Installation and requirements
The publisher provides EXE (NSIS) installers for 64-bit Windows. It can be installed for the current user only, without administrator rights. A silent install is possible with the installer’s documented switches.
Updates and version history
The current version is 4.1.0, released on July 7, 2026. The version history goes back to March 30, 2021: 25 releases, all linked to the official files. That is about 4.7 releases a year.
Popularity and file types
The Chocolatey package has been downloaded 2,014 times. The source code on GitHub (lukehaas/RunJS) has 2,173 stars. On Windows it registers 2 file types, including .js and .ts. Similar programs include Go Programming Language, LLVM and Deno.
Project description on GitHub: “RunJS is a JavaScript playground for macOS, Windows and Linux. Write code with instant feedback and access to Node.js and browser APIs.”
Pros / Cons
Pros
- Documented silent install
- Installs without administrator rights
Cons
- Proprietary licence: check the terms and price
- No native ARM64 build
In short: RunJS is a languages & sdk tool for 64-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Is RunJS safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
1CF20CB4C69ED25586AF033B782FEED7A80E80ECB501E0DB7E0F3D88A43A5844· Open the VirusTotal report for this hash - The link has not been checked yet
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 25 versions ›25 versions over 5 years · about 4.7 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 4.1.0Latest | July 7, 2026 | — | 64-bit EXE (NSIS) |
| 3.2.0 | September 28, 2025 | — | 64-bit EXE (NSIS) |
| 3.1.2 | May 10, 2025 | — | 64-bit EXE (NSIS) |
| 3.1.1 | April 29, 2025 | — | 64-bit EXE (NSIS) |
| 3.1.0 | April 20, 2025 | — | 64-bit EXE (NSIS) |
| 3.0.3 | October 7, 2024 | — | 64-bit EXE (NSIS) |
| 2.12.1 | May 21, 2024 | — | 64-bit EXE (NSIS) |
| 2.12.0 | April 23, 2024 | — | 64-bit EXE (NSIS) |
Install from the command line
Silent install ›winget install --id lukehaas.RunJS -echoco install runjs -yRunJS-Setup-4.1.0.exe /SRelated guide: How to use winget: install and update apps
Also for other systems
brew install --cask runjsInformation
- Publisher
- Haas Labs Ltd
- Category
- Languages & SDKs
- Licence
- Proprietary
- Price
- See the publisher’s site
- Source code
- github.com/lukehaas/RunJS
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (NSIS)
- Version
- 4.1.0
- Released
- July 7, 2026
- Added to the catalogue
- March 30, 2021
- Versions listed
- 25
- Updates / year
- 4.7
- Chocolatey downloads
- 2,014
- GitHub stars
- 2,173
- GitHub forks
- 53
- Website
- runjs.app
- winget ID
- lukehaas.RunJS
- Chocolatey package
- runjs
File types it opens (2)
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to RunJS
See all ›-
Go Programming Language1.27.0An open source programming language that makes it simple to build secure, scalable systems.Open source2.1M ↓ -
Open source2.8M ↓ -
Open source249.7K ↓ -
Open source3.7M ↓ -
Yarn1.22.22Yarn is a package manager that doubles down as project manager. Whether you work on one-shot projects or large monorepos, as a hobbyist or an enterprise user, we've got you covered.Open source1.9M ↓ -
Ccache4.14.1Ccache is a compiler cache. It speeds up recompilation by caching previous compilations and detecting when the same compilation is being done again.Open source2.2M ↓ -
Open source773.9K ↓ -
Open source263.6K ↓
Frequently asked questions
Is RunJS free?
RunJS is proprietary (closed-source) software (licence: Proprietary). Whether it costs money depends on the edition: check the publisher’s site for prices and free tiers.
Is RunJS safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install RunJS with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can RunJS be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does RunJS run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of RunJS?
The versions page lists all 25 versions with links to their official installer files, back to March 30, 2021.
Can I use RunJS without administrator rights?
Yes, there is a per-user installer that does not need administrator rights.
What are alternatives to RunJS?
Go Programming Language, LLVM, Deno, CMake and Yarn. The alternatives page compares them.
