Cannot read property 'setState' of undefined [duplicate]

Answer 1

You also may need to add this.apiCall = this.apiCall.bind(this) before the this.apiCall('surfing'); on your constructor method. This will bind the scope of apiCall to the scope of the react component.

More here: https://facebook.github.io/react/docs/handling-events.html

Also, remove this.apiCall('surfing'); from the constructor and put it into a componentDidMount function, the constructor should not be used for execution.