Open .JSX files online
A .jsx file is JavaScript with JSX — the XML-like syntax for describing UI components that React popularized. The .jsx extension tells build tools to parse JSX in the file. This is how React code was written for years before TypeScript adoption, and how many JavaScript React codebases are still written today.
JSX looks like HTML inside JavaScript (<Button onClick={…}>Save</Button>), but it is syntax that compiles down to function calls. Reading a .jsx is how you see what a component renders and how its logic is wired — without running it.
What is a `.jsx` file?
JSX is a syntax extension, not valid plain JavaScript: a browser cannot run it until a compiler (Babel, SWC, esbuild, or TypeScript's compiler with JSX enabled) transforms the tags into React.createElement or the newer JSX-runtime calls. The .jsx extension is the signal to tooling that this transform is needed.
A .jsx file is plain text (UTF-8). It differs from .tsx only in the absence of TypeScript's static types — the JSX syntax itself is identical. MIME type: text/jsx.
- React components in plain-JavaScript projects
- React Native screens written in JavaScript
- Legacy React codebases from before TypeScript adoption
- Tutorials, examples, and starter kits for React
How to open a `.jsx` online
Open ZipTool in a new tab, then drop your .jsx onto the page — or click to browse for it, or paste a URL. The file opens in the Monaco code editor, with syntax highlighting, code folding, and find, read entirely on your device.
- Drag your
.jsxonto the page — or click to browse, or paste a URL. - It opens immediately in the Monaco code editor, with syntax highlighting, code folding, and find. No install, no sign-up.
- Read, search, or copy it. Your file never leaves your browser.
Open `.jsx` without uploading
Most "open jsx online" sites work by uploading your file to a server and processing it there. ZipTool does the opposite: it loads its parser once, then reads your .jsx locally in the browser tab. The contents stay on your device.
You can prove that in seconds. Open the page, press F12 for DevTools, switch to the Network tab, and open your file — no request carrying the file's contents is sent. You can also turn off Wi-Fi after the page loads and the file still opens. See security and privacy for the full picture.
Frequently asked questions
How do I open a .jsx file online?
Drag the .jsx onto the page (or click to browse, or paste a URL). It opens in the code editor so you can read the component markup and logic, search, and copy — it is not compiled or executed. The file is parsed entirely in your browser and never uploaded.
Can I view a .jsx without uploading it?
Yes. ZipTool reads the file locally in your browser tab — no upload, no server-side copy. Confirm it with DevTools (F12, Network tab) while opening the file, or by turning off Wi-Fi after the page loads and verifying the file still opens.
What is the difference between .jsx and .tsx?
Both contain JSX syntax for UI components. .jsx is JavaScript with JSX — no static types. .tsx is TypeScript with JSX, so components' props get type-checked at compile time. The two differ only in the presence of TypeScript; a project uses whichever language it is written in.
Is JSX the same as HTML?
It resembles HTML but is not HTML. JSX is JavaScript syntax: attribute names differ (className instead of class, htmlFor instead of for), all tags must be explicitly closed, braces {…} embed JavaScript expressions, and it compiles to function calls rather than being parsed by the browser's HTML parser.