Jinja2 Filters

Filters let you transform values at render time.

Syntax:

html

{{ value | filter_name }}

html

{{ value | filter_name }}

Common built-in filters

html

<p>{{ username | lower }}</p>
<p>{{ username | upper }}</p>
<p>{{ items | join(", ") }}</p>

html

<p>{{ username | lower }}</p>
<p>{{ username | upper }}</p>
<p>{{ items | join(", ") }}</p>

html

<p>{{ bio | default("No bio yet") }}</p>

html

<p>{{ bio | default("No bio yet") }}</p>

html

<p>Count: {{ items | length }}</p>

html

<p>Count: {{ items | length }}</p>

|safe|safe tells Jinja “don’t escape this value”.

Only use it if you’re absolutely sure the HTML is trusted.

Never mark raw user input as safe.

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