Cannot read property 'setState' of undefined [duplicate]

Answer 1

You can assign the current context this to a variable, also be consistent either use ES5 or ES6.

apiCall(term) {
  const params = {
    part: 'snippet',
    key: APP_KEY,
    q: term,
    type: 'video'
  };
  const _this = this;

  axios.get(APP_URL, { params: params})
   .then((response) => {
     _this.setState({
       videos: response
     });
   })
   .catch((error) => {
    console.error(error);
   });
}