“SyntaxError: Unexpected token < in JSON at position 0”

Question

In a React app component which handles Facebook-like content feeds, I am running into an error:

Feed.js:94 undefined \"parsererror\" \"SyntaxError: Un

Answer 1

This might be old. But, it just occurred in angular, the content type for request and response were different in my code. So, check headers for ,

 let headers = new Headers({
        'Content-Type': 'application/json',
        **Accept**: 'application/json'
    });

in React axios

axios({
  method:'get',
  url:'http://  ',
 headers: {
         'Content-Type': 'application/json',
        Accept: 'application/json'
    },
  responseType:'json'
})

jQuery Ajax:

 $.ajax({
      url: this.props.url,
      dataType: 'json',
**headers: { 
          'Content-Type': 'application/json',
        Accept: 'application/json'
    },**
      cache: false,
      success: function (data) {
        this.setState({ data: data });
      }.bind(this),
      error: function (xhr, status, err) {
        console.error(this.props.url, status, err.toString());
      }.bind(this)
    });
  },