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What is the Closure Compiler?
The Closure Compiler is a tool for making JavaScript download and run
faster. Instead of compiling
from a source language to machine code, it compiles from JavaScript to
better JavaScript. It parses your JavaScript, analyzes it, removes
dead code and rewrites and minimizes what's left. It also checks
syntax, variable references, and types, and warns about common
JavaScript pitfalls.
How can I use the Closure Compiler?
You can use the Closure Compiler as:
An open source Java application that you can run from the
command line.
A library you can depend on via Bazel.
An NPM package
To get started with the compiler, see "How do I start" below.
What are the benefits of using Closure Compiler?
Efficiency. The Closure Compiler reduces the size of
your JavaScript files and makes them more efficient, helping your
application to load faster and reducing your bandwidth needs.
Code checking. The Closure Compiler provides warnings
for illegal JavaScript and warnings for potentially dangerous
operations, helping you to produce JavaScript that is less buggy and
easier to maintain.
Except as otherwise noted, the content of this page is licensed under the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-03-17 UTC.
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