# Building Node.js with Ninja

The purpose of this guide is to show how to build Node.js using [Ninja][], as
doing so can be significantly quicker than using `make`. Please see
[Ninja's site][Ninja] for installation instructions (Unix only).

[Ninja][] is supported in the Makefile. Run `./configure --ninja` to configure
the project to run the regular `make` commands with Ninja.

For example, `make` will execute `ninja -C out/Release` internally
to produce a compiled release binary, It will also execute
`ln -fs out/Release/node node`, so that you can execute `./node` at
the project's root.

When running `make`, you will see output similar to the following
if the build has succeeded:

```txt
ninja: Entering directory `out/Release`
[4/4] LINK node, POSTBUILDS
```

The bottom line will change while building, showing the progress as
`[finished/total]` build steps. This is useful output that `make` does not
produce and is one of the benefits of using Ninja. Also, Ninja will likely
compile much faster than even `make -j4` (or
`-j<number of processor threads on your machine>`). You can still pass the
number of processes to run for [Ninja][] using the environment variable `JOBS`.
This will be the equivalent to the `-j` parameter in the regular `make`:

```bash
$ JOBS=12 make
```

## Producing a debug build

To create a debug build rather than a release build:

```bash
$ ./configure --ninja --debug && make
```

[Ninja]: https://ninja-build.org/
