This node app / website uses the 500px API.
You will need to create your own "keys" file in modules/
Suggested syntax:
var API500 = require('600px'), api500 = new API500({
consumer_key: 'key from 500px.com', consumer_secret: 'secret from 500px.com',
token: "", token_secret: ""
});
` module.exports = api500;