Is this JavaScript viewer free?

Yes. It runs in your browser for free and needs no registration or installation.

Are my JavaScript files uploaded?

No. Files opened from your device stay on your device. Only public sample files come from the server.

Does it support .mjs, .cjs, and .jsx?

Yes. The viewer reads .js, .mjs, .cjs, and .jsx extensions equally.

Elysia Tools

Navigation

Text Files

JavaScript Viewer

Free online JavaScript viewer. Open .js, .mjs, .cjs, and .jsx files directly in your browser without uploading them.

.js.mjs.cjs.jsx

Simple JS Module

Loading viewer…

Try a sample file

Tool usage guide

About this file format

.js (JavaScript) is the programming language of the web, standardized as ECMAScript. .mjs marks ES modules, .cjs marks CommonJS modules (Node.js), and .jsx extends JavaScript with XML-like syntax for React components. JavaScript runs in browsers, on servers (Node.js, Bun, Deno), and in many build tools and CLIs.

JavaScript Viewer

About this file format

Other file viewers

JavaScript Viewer

Overview

When to use

How it works

Use cases

FAQ

Markdown Viewer

TXT Viewer

JSON Viewer

YAML Viewer

XML Viewer

HTML Viewer