Which Jinja2 syntax should you use to safely display a variable named username in a Flask template?

easy📝 Conceptual Q2 of 15

Flask - Security Best Practices

Which Jinja2 syntax should you use to safely display a variable named username in a Flask template?

A{{ username|safe }}

B{{ username }}

C{% raw username %}

D{{ username|escape }} (double escape)

Step-by-Step Solution

Solution:

Step 1: Identify safe default rendering
Using {{ username }} automatically escapes content, preventing XSS safely.
Step 2: Analyze other options
|safe disables escaping (unsafe), {% raw %} is for raw blocks, and double escaping is unnecessary.
Final Answer:
{{ username }} -> Option B
Quick Check:
Safe display = B [OK]

Quick Trick: Use {{ variable }} for safe automatic escaping [OK]

Common Mistakes:

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