STEP1: in html header tag

                      <meta name="csrf-token" content="lqtaEK8Q2DhbznWYTesWD04nYn4aBpyIxhm3L0qE" />
                      

STEP2: in html part for button

                      <input type="text" name="name" class="form-control name" placeholder="Name" required="">
                      <input type="password" name="password" class="form-control password" placeholder="Password" required="">
                      <button class=" btn-submit">Submit</button>
                      

STEP 3: button click event in jquery

                      //***  start button click event */
                      $(".btn-submit").click(function(e){

                      });
                      

STEP 4: get form input fields value

                      $(".btn-submit").click(function(e){

                          //*********** get data from form fields */
                          var name = $(".name").val();
                          var password = $(".password").val();
                      });
                      

STEP 5: send request to server using ajax

                      $(".btn-submit").click(function(e){

                          var name = $(".name").val();
                          var password = $(".password").val();

                          //*************  send request to server using ajax */
                          $.ajax({
                              type:'POST',
                              url:"{ route('ajaxRequest.post') }",                              
                              success:function(data){
                                  
                              }
                          });
                      });
                      

STEP 6: send data to server using ajax

                      $(".btn-submit").click(function(e){

                          var name = $(".name").val();
                          var password = $(".password").val();


                          $.ajax({
                              type:'POST',
                              url:"{ route('ajaxRequest.post') }",  
                              //** send data to server */
                              data:{name:name, password:password},                            
                              success:function(data){
                                  
                              }
                          });
                      });
                      

Note that data: parameter

STEP 7: send csrf token

                      $(".btn-submit").click(function(e){

                          var name = $(".name").val();
                          var password = $(".password").val();


                          $.ajax({
                              type:'POST',
                              url:"{ route('ajaxRequest.post') }",  
                              //** send csrf-token to server */
                              headers: {
                                  'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                              }
                              data:{name:name, password:password},                            
                              success:function(data){
                                  
                              }
                          });

                      });
                      

Note that header parameter