How do you pass data from a Django backend to a JavaScript frontend on a template-rendered page?

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How Do You Pass Data from a Django Backend to a JavaScript Frontend on a Template-Rendered Page?

One of the common tasks in full stack Python development is passing data from the Django backend to the JavaScript frontend in a template-rendered page. Here are the most effective ways to do this:

1. Using Template Context and JSON

In Django, you pass data to the HTML template via the view:

python

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# views.py

from django .shortcuts import render

def my_view(request):

data = {'name': 'Alice', 'age': 25}

return render(request, 'template.html', {'data': data})

In your HTML (template.html), you can inject the data into a script:

html

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<script>

const userData = {{ data|safe }};

console.log(userData.name); // Outputs: Alice

</script>

2. Using json_script for Safer Data Passing

Django provides the json_script template tag to safely include JSON data:

html

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{% load json_script %}

{{ data|json_script:"user-data" }}

<script>

const userData = JSON.parse(document.getElementById('user-data').textContent);

console.log(userData.age); // Outputs: 25

</script>

3. Using Data Attributes

Alternatively, small bits of data can be embedded into HTML using data-* attributes:

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<div id="user" data-name="{{ data.name }}" data-age="{{ data.age }}"></div>

<script>

const user = document.getElementById('user');

const name = user.dataset.name;

const age = user.dataset.age;

console.log(name, age);

</script>

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