Online JavaScript Editor
Write JavaScript, run it in the browser, and share the link — all in real time.
ShareCode is a browser-based JavaScript editor with real-time collaboration and an instant shareable link. Write or paste your code, click Run, and see console output right in the panel — no build step, no setup, no sign-up.
JavaScript is the one language on ShareCode you can both share and execute, because it runs directly in the browser. That makes the editor genuinely interactive for JS: prototype a function, test a regex, check what a snippet logs, and share the working result with someone — all in the same space.
Select a portion of code to run just that part, or run the whole file, and the output appears live for everyone in the code space. Combined with real-time editing, that turns it into a shared scratchpad where two people can write and verify JavaScript together.
Why use an online JavaScript editor?
For JavaScript specifically, a browser editor has a real advantage: the browser *is* the runtime. There's no toolchain to install and no environment to match — the code runs in the same kind of engine your users have. For quick experiments, teaching, and interviews, that immediacy beats spinning up a Node project or a bundler.
Add live collaboration on top and it becomes a shared workbench. Instead of pasting a snippet into chat and asking "does this log what you expect?", you both open the space, run it, and watch the same console output. The feedback loop that normally takes a back-and-forth happens in one place.
Run in the browser
Click Run to execute your JavaScript and see console output instantly — run a selection or the whole file.
Real-time collaboration
Everyone in the code space edits together with live cursors and sees the same output.
Instant shareable link
Share the URL and collaborators join immediately — no account required.
How to use the JavaScript editor
Open a code space
Click "Open the editor" to spin up a fresh space at its own URL — no install, no account.
Write your JavaScript
Type or paste code. JavaScript is the default language, so highlighting and Run are ready immediately.
Click Run
Run the whole file or select a block to run just that part. Console output appears in the panel below.
Share and iterate
Send the link so others can read, run, and edit the same code — and see the same output you do.
A JavaScript starting point
function greet(name) {
return `Hello, ${name}!`;
}
console.log(greet("world"));What it's great for
Prototyping and testing snippets
Try a function, a bit of array logic, or a regex and see what it logs without leaving the browser. It's the fastest path from idea to "does this actually work?"
Live coding interviews
Have a candidate write JavaScript and run it on the spot. You both see the output, so the conversation is about real behaviour rather than code read off a screen-share.
Teaching JavaScript
Demonstrate closures, async, or array methods by editing and running live while students watch the result change. The instant Run loop makes concepts concrete.
Debugging with a teammate
Drop the failing snippet into a space, add a console.log, run it together, and fix it as a pair — faster than describing the bug in messages.
Frequently asked questions
Does my JavaScript actually run?
Yes. JavaScript executes directly in your browser — click Run to see console output. You can run a selected block or the entire file.
Can others see the output too?
Everyone in the code space shares the same live editor, so collaborators see your code and can run it themselves to get the same output.
Do I need to install Node?
No. The code runs in the browser, so there's nothing to install. For full Node APIs and packages you'd still use a local project, but for language-level JavaScript the browser runtime is enough.
Is it free and account-free?
Yes — open a space, run code, and share the link with no sign-up and no cost for collaborators.
JavaScript snippets to try
Debounce a function in JavaScript
Delay running a function until the calls stop coming in — the standard fix for resize, scroll, and search-as-you-type handlers that fire far too often.
Deep clone an object in JavaScript
Make a fully independent copy of a nested object so mutating the copy never touches the original.
Start writing JavaScript now
A fresh code space, a shareable link, and real-time collaboration — in seconds.