Assuming you have installed node.js you have to do this steps:
-Go to your app directory
-In the command line type npm install express if you dont have installed express
-Then type npm install to install all the dependencies especified on the package.json
-Then type node app.js to start the server
-then go to your browser to http://localhost:3000 to view the site
You should see this page:
then in the tex field input, you should put the coordinates you what
in this order (latitude,longitude)
for example: 29.78,-95.33
then a popup will come out and you just have to wait until the image appears
To browse all NASA API's go to https://api.nasa.gov/