How to Prevent HTML Escaping in Flask Templates with Jinja2 and SQLAlchemy?

Preserving HTML Rendering in Flask and SQLAlchemy with Jinja2

In creating an admin interface for Flask with SQLAlchemy, you may encounter an issue where HTML passed to your view using render_template becomes escaped, resulting in characters like <"'> being converted to HTML entities. This can disrupt the intended rendering of your HTML elements. To address this, it's necessary to disable the automatic escaping of HTML.

Solution:

To prevent Jinja2 from escaping HTML, you can use the |safe filter when rendering a value. Simply add |safe to the end of your template code like so:

{{ something|safe }}

Caution:

It's important to exercise caution when using the |safe filter. Only apply it to trusted data, as rendering untrusted data without proper escaping can create cross-site scripting vulnerabilities.

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