JavaScript Code Viewer

What is JavaScript Code Viewer

Written by Giorgos Kostas. Last reviewed: April 18, 2026

JavaScript Code Viewer formats JavaScript, TypeScript, JSX, and Node snippets with a syntax-aware formatter, then renders the result with syntax highlighting.

Nothing is uploaded — the tool runs entirely in the browser so it works well even with proprietary code.

Why use it

• Review minified or mangled JS on the fly.
• Re-indent code copied from logs or chat.
• Share readable snippets with teammates.
• Audit bundler output or codegen.
• Teach JS with clean examples.

Features

• Syntax-aware JavaScript and TypeScript formatting
• JS syntax highlighting
• Works with JS, TS, JSX
• Template literals and JSX preserved
• Fast copy-paste

How to use JavaScript Code Viewer

1. Paste JS / TS. Drop any JS-like source into the viewer.
2. Click Run. Output is re-indented and highlighted.
3. Copy result. Paste into your doc or review.

Example (before/after)

function greet(n){console.log("Hi "+n);}greet("Ada");

function greet(n) {
  console.log("Hi " + n);
}
greet("Ada");

Common errors

FAQ

Related tools

Pair with JavaScript Beautifier, escape/unescape, and regex tester. You can also browse the full Viewers category for more options.