Fullcalendar Unknown option 'header' version 5.5.1

Question

I try to use fullcalendar and show header nav buttons but not working

JS code

$(function(){
      var calendarEl = $('#calendar');
      var calendar = new FullCalendar.Calendar($(calendarEl)[0], {
        initialView: 'dayGridMonth',
        weekends: true,
        navLinks: true,
        header: {
          left: 'prev,next today',
          center: 'title',
          right: 'year,month,basicWeek,basicDay'

        },
      });
      calendar.render();
    });

Thank you for you help, it's for work...

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Answer 1

You are using fullcalendar v5, and following old documentation, here is V5 DOCS

var calendar = new Calendar(calendarEl, {
  headerToolbar: { center: 'dayGridMonth,timeGridWeek' }, // buttons for switching between views
});