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<sc ript>
  var button = document.querySelector("#uid19");
        button.addEventListener("click", function() 
         {
            inp = document.querySelector('.form-control').value;
            console.log(inp);
            let url = "https://14082020test.bitrix24.ru/rest/1/*******/crm.lead.add.JSON"
// let data = {'TITLE': 'Testing lead'}
         let data = {
         'fields':{
         'TITLE': inp,
         'EMAIL':{'n0':{'VALUE':inp,
                  'VALUE_TYPE':'WORK'}},
        'COMMENTS':'Зараза'
       }
     };

  /*  var xmlhttp = new XMLHttpRequest();
              xmlhttp.open("POST",url, true);
              xmlhttp.send(data);
              console.log(data);
           */
           fetch(url, {
       method: 'POST', 
       headers: new Headers({
       Accept: 'application/json',
      'Content-Type': 'application/json'
    }),  
   body: JSON.stringify(data)
  }).then(response => response.text())
    .then((data) =>  console.log(data))
    }
         );
   </sc ript>

headers: new Headers({        Accept: 'application/json',       'Content-Type': 'application/json'   

<sc ript>
  var button = document.querySelector("#uid19");
        button.addEventListener("click", function() 
         {
            inp = document.querySelector('.form-control').value;
            console.log(inp);
            let url = "https://14082020test.bitrix24.ru/rest/*/*********/crm.lead.add/?"
// let data = {'TITLE': 'Testing lead'}
         let data = {
         'fields':{ 
           'TITLE': 'toster',
           /*'EMAIl' :{
                    'n0' : 
                 {
                 "VALUE" : inp ,
                 "VALUE_TYPE" : "WORK" }}*/
               }
      };
    var xmlhttp = new XMLHttpRequest();
              xmlhttp.open("POST",url, true);
              xmlhttp.send(data);
              console.log(data);
          // fetch(url, {
      //  method: 'POST',
      //  body: JSON.stringify(data)
      //  contentType: 'application/json',
  // }).then(response => response.text())
  //  .then((data) =>  console.log(data))
    }
         );
   </sc ript>