Error VM1673:1 SyntaxError was raised due to an unexpected token '<' appearing in the code

I am facing an issue with the following JS code for AJAX form submission using PHP 8. When I check the chrome browser console, I encounter the error message: "Uncaught SyntaxError: Unexpected token '<', "

What could be causing this problem?

$('#add-blog1-form').on('submit', function(e){
  e.preventDefault();
  let formData = new FormData(this);
  let dateTime = new Date();
  formData.append('request', "createBlog1");
  formData.append('datetime', +dateTime);
  $.ajax({
    url: 'action.php',
    type: "POST",
    data:  formData,
    contentType: false,
    cache: false,
    processData:false,
    success: function(data){
      let json_response = JSON.parse(data);
      console.log(json_response);
      if(json_response.status == "success"){
        let forum_category =  $('#category').val();
        window.location = "categories.php?id="+forum_category;
      }else{
        alert("Error");
      }
    },
    error: function(){}
  });
});

Answer №1

When attempting to convert a structure to JSON that is not compatible with the format, this error is triggered. It appears that the issue lies within the following code snippet:

let json_response = JSON.parse(data);

This could be due to the data received from the server not being in valid JSON format.

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