What's wrong? (Uncaught (in promise) SyntaxError: Unexpected token & lt; in JSON at position 0)?

• 0
  here is the code for submitting the data from the form
  
  

  document.addEventListener('DOMContentLoaded', function () {
    const form = document.getElementById('form');  
    form.addEventListener('submit', formSend)
  
    async function formSend(e) {
      e.preventDefault();
  
      let error = formValidate(form);
    
      let formData = new FormData(form); 
      if (error === 0){
        form.classList.add('_sending');
          let response = await fetch('mail.php', {
            method: 'POST',
            body: formData
          });
          if (response.ok){
            let result = await response.json();
            alert(result.message);
            form.reset();
            form.classList.remove('_sending');
          } else {
            alert('Ошибка');
            form.classList.remove('_sending');
          }
      } else{
        alert('Заполните все поля')
      }
    }
    
    function formValidate(form) {
      let error = 0;
      let formReq = document.querySelectorAll('._req');
  
      for (let index = 0; index < formReq.length; index++) {
        const input = formReq[index];    
         formRemoveError(input);
  
         if (input.classList.contains('_email')){
            if(emailTest(input)){
              formAddError(input)
              error++;
            }
         }else if(input.getAttribute("type") === "checkbox" && input.checked === false){
          formAddError(input)
          error++;
         } else{
           if (input.value === ''){
              formAddError(input)
              error++;
           }
         }
      }
      return error;
    }
  
      function formAddError(input) {
        input.parentElement.classList.add('_error');
        input.classList.add('_error')
      }
      function formRemoveError(input) {
        input.parentElement.classList.remove('_error');
        input.classList.remove('_error')
      }
      function emailTest(input) {
        return !/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,8})+$/.test(input.value)
      }
  });

  
  Throws an error in

  JavaScript Sean Shepard, Jan 13, 2019

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1 Answers
• 0
  No JSON comes from the server.

  Bennett Schaefer

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