JavaScript Minifier

Compress JavaScript source for smaller snippets, bundles, and embedded code.

Input
Output
0 characters 0 lines

What does JavaScript Minifier do?

JavaScript Minifier reduces JavaScript size by removing whitespace, comments, and optional syntax overhead.

  • Primary use: JavaScript Minifier reduces JavaScript size by removing whitespace, comments, and optional syntax overhead.
  • Key technical fact: Minification changes source text but should preserve runtime behavior; always test minified scripts before release.
  • Practical check: Run the formatted or minified output through your parser, tests, or runtime when exact syntax behavior matters.
Topic Direct answer Source
Direct answer JavaScript Minifier reduces JavaScript size by removing whitespace, comments, and optional syntax overhead. ECMAScript specification
Key fact Minification changes source text but should preserve runtime behavior; always test minified scripts before release. ECMAScript specification
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Reduce JavaScript size, then test behavior

JavaScript Minifier removes comments, line breaks, indentation, and other avoidable characters to produce compact source text. It is useful for small snippets, examples, embedded scripts, and quick size reductions.

Minification is not full bundling or advanced optimization. It may not transpile modern syntax, resolve imports, tree-shake modules, protect public API names, or preserve license comments unless the implementation explicitly supports those cases.

How to use

  1. Paste your JavaScript code into the input editor.
  2. Click Minify JavaScript to compact the source.
  3. Test the minified script in the target browser or runtime before release.
  4. Use Copy for the clipboard, Download for a file, or Clear to reset.

What is JavaScript Minifier?

JavaScript Minifier is a browser-based utility for turning readable JavaScript into a smaller text form. It keeps the program recognizable enough for quick use while reducing unnecessary characters.

JavaScript can be sensitive to automatic semicolon insertion, directive prologues, regular expressions, template literals, and scope-sensitive names. Treat minified output as something to test, not just something to paste.

Input notes

Paste JavaScript source only. Keep a readable source copy, and use your build pipeline for production bundles that need source maps, transpilation, module resolution, or license preservation.

Example

A commented function is reduced to a compact form:

--- Formatted Input ---
// Greeting function
function hello(name) {
  console.log("Hello, " + name + "!");
}

--- Minified Output ---
function hello(name){console.log("Hello, "+name+"!");}

MCP integration

MCP (Model Context Protocol) lets AI agents and apps discover and run Coding.Tools utilities for repeatable conversions, formatting, hashing, and generation workflows.

MCP tool name: javascript-minifier

MCP endpoint: https://coding.tools/mcp

Call tools/list first. Each tool entry includes inputSchema, outputSchema, and examples so an AI agent or client can build valid arguments without guessing.

For tools/call, read result.content[0].text for the display value and result.structuredContent for machine parsing. Tool-level failures return isError: true; protocol failures return a JSON-RPC error.

Example tools/call request:

curl -s https://coding.tools/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "MCP-Protocol-Version: 2025-06-18" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"javascript-minifier","arguments":{"input":"function total(items) { return items.reduce((sum, item) => sum + item.price, 0); }"}}}'

Most text and data tools accept an input string plus optional options. Browser-only image tools are listed for discovery and return a web UI link when they need browser image APIs.