where I can find the code for the API to get the opening jobs list and display it on my website

where I can find the code for the API to get the opening jobs list and display it on my website

I am making a web site for a client and they ask me to display the opening jobs list on there website using the API. 
But im a web developper beginner and  and i did'nt find the code to fetch and display all opening jobs.