getting fatal error for autoload.php

[nikunjsoni001]

PHP Warning: require(/var/www/laravel-api-example-master/vendor/autoload.php): failed to open stream: No such file or directory in /var/www/laravel-api-example-master/artisan on line 18
PHP Fatal error: require(): Failed opening required '/var/www/laravel-api-example-master/vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/laravel-api-example-master/artisan on line 18

*And vender folder is not present in laravel