urlpatterns = [
    path(‘admin/‘, admin.site.urls),
    # ajax 相关
    path("ajax_json/", views.ajax_json),

]

def ajax_json(request):
    import json

    print(1, request.POST)
    print(2, request.body)
    print(3, request.FILES)
    data = json.loads(request.body.decode())
    print(data, type(data))
    return HttpResponse("ok")

<hr>
<button id="btn4">上传json数据</button>
<hr>

<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>

<script>

    {#上传json数据#}
    $("#btn4").click(function () {
        $.ajax({
            url: "/ajax_json/",
            type: "post",
            contentType: "json",
            headers: {"X-CSRFToken": $("[name=‘csrfmiddlewaretoken‘]").val()}, // 在请求头中添加csrf
            data: JSON.stringify({
                a:12,
                b:23,
                user: "alex",
            }),
            success: function (data) {
                console.log(data)
            }
        })
    });

</script>