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Download and install
Installing as a Linux package
For Linux, njs modules packages can be used:
nginx-module-njs— njs dynamic modulesnginx-module-njs-dbg— debug symbols for thenginx-module-njspackage
After package installation, njs dynamic modules need to be loaded with the load_module directive:
load_module modules/ngx_http_js_module.so;
  or
load_module modules/ngx_stream_js_module.so;
  Building from the sources
The repository with njs sources can be cloned with the following command: (requires Mercurial client):
hg clone http://hg.nginx.org/njs
  Then the modules should be compiled from nginx root directory using the --add-module configuration parameter:
./configure --add-module=path-to-njs/nginx
  The modules can also be built as dynamic:
./configure --add-dynamic-module=path-to-njs/nginx
  To build only njs command-line utility, run ./configure and make njs commands from njs root directory. The utility is available as ./build/njs.