JSONDecodeError при использовании json.loads

Я получаю Expecting value: line 1 column 1 (char 0) при попытке использовать json.loads

Просматривал похожие вопросы, но не смог найти решение для своего кода.

Выдает ошибку для строки: body = json.loads(body_unicode)

network.js:

//When user clicks the save button
save_button.addEventListener("click", event => {
    new_content = document.getElementByID(`new_content_${postID}`);

    //Make fetch request to update the page
    fetch(`/edit/${postID}`,{
        method: "POST",
        body: JSON.stringify({
            content: new_content.value,
        })
    })

    .then(response => {
        if(response.ok || response.status == 400) {
            return response.json()
        } else {
            return.Promise.reject("Error:" + response.status)
        }
    })
    .then(result => {
        new_content.innerHTML = result.content;
        cancelEdit(postID);
    })
    .catch(error => {
        console.error(error);
    })
})

views.py:

def edit(request, id):
    if request.method == "POST":
        body_unicode = request.body.decode('utf-8')
        body = json.loads(body_unicode)
        new_content = body['content']
        AllPost.objects.filter(id = id).update(content = new_content)
        return JsonResponse({"message": "Post updated successfully.", "content": new_content}, status=200)
    return JsonResponse({"error": "Bad Request"}, status = 400)

index.html:

{% for post in page_obj %}
    {{ post.full_name|upper }}<br>
    
        <div class="frame">
            <h4><a href="{% url 'profile' post.user.username %}" style="color: black;">{{post.user.username}}</a></h4>
            {% if post.user == user %}
                <button class="btn btn-sm btn-outline-primary" data-id="{{post.id}}" id="edit_button_{{post.id}}">Edit</button>
            {% endif %}
            <div id="content_{{post.id}}">{{post.content}}</div>
            <form action="{% url 'edit' post.id %}" method="post" id="edit_form_{{post.id}}" style="display: none;">
                {% csrf_token %}
                <div class="form-group"><textarea id="new_content_{{post.id}}" name="new_content" cols="30"></textarea></div>
                <input class="btn btn-sm btn-success" id="save_{{post.id}}" type="submit" value="Save">
                <input class="btn btn-sm btn-danger" id="cancel_{{post.id}}" type="submit" value="Cancel">
            </form>
            
            <div class="grey" id="timestamp">{{post.date}}</div>
            <div class="grey">{{post.likes}}</div>
            <a href="#" style="color: grey;">Comment</a>
        </div>

Вернуться на верх