How to run composer.json?

i used 'composer install' and it's working good

composer install

or

php composer install

use composer update in the same folder that has composer.json, when the composer command (eg. test with composer --version) already exists in your terminal.

You must download composer:

curl -sS https://getcomposer.org/installer | php

or

php -r "readfile('https://getcomposer.org/installer');" | php

and next you should run if you have composer.json file:

composer.phar install

or if you want create new project

composer.phar create-project