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Quoted expression in Jinja2 - Stack Overflow

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ChatGPT told me that:

In Jinja2, if an expression is enclosed in quotes (single or double), it is treated as a literal string, and the entire content, including the expression, will be output as-is. Jinja2 does not parse or evaluate expressions within quoted strings.

However I tested the following template:

{% set name = "Jason" -%}
Name: "{{ name }}"

The output is

Name: "Jason"

While according to ChatGPT it should be:

Name: {{ name }}

So is ChatGPT wrong? What is the behavior of double/single quote in jinja2?

ChatGPT told me that:

In Jinja2, if an expression is enclosed in quotes (single or double), it is treated as a literal string, and the entire content, including the expression, will be output as-is. Jinja2 does not parse or evaluate expressions within quoted strings.

However I tested the following template:

{% set name = "Jason" -%}
Name: "{{ name }}"

The output is

Name: "Jason"

While according to ChatGPT it should be:

Name: {{ name }}

So is ChatGPT wrong? What is the behavior of double/single quote in jinja2?

Share Improve this question asked Nov 21, 2024 at 3:19 codewarriorcodewarrior 99110 silver badges30 bronze badges
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2 Answers 2

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So is ChatGPT wrong?

No.

When you write:

Name: "{{ name }}"

The quotes are not part of the Jinja template expression. They are literal text in your document. Jinja only evaluates expressions within {{...}} markers. If you had written this:

Name: {{ "name" }}

Jinja would interpret "name" as a literal string and the output would be:

Name: name

And if you had written:

Name: "{{ "name" }}"

The output would be:

Name: "name"

ChatGPT is partially correct. It only happens within Jinja tags, not the whole source of a Jinja2 template. When using quotes in HTML, Jinja doesn't replace them outside of tags.

If you do want to escape Jinja templating, you have other ways to do it:

  1. Output a string with the code:
    {{ "{{ name }}" }}
    
  2. Use HTML entities:
    {{ name }}
    
  3. Use the Jinja {% raw %} tag:
    {% raw %}
        {{ name }}
    {% endraw %}
    
    (should you want to print {{ endraw }}, use another escaping method)
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