Jinja2 Template Renderer

Paste a Jinja2 template and JSON or YAML data, get the rendered output. Variables, loops, conditionals, and filters supported. Runs entirely in your browser, no upload, no sign-up.

About this tool

Render a Jinja2 (Jinja) template against JSON or YAML data, entirely in your browser. Paste your template, supply your data, and get the rendered output instantly — nothing is uploaded to a server.

What's supported

Variable substitution — {{ name }} is replaced by the matching value in your data.
Nested paths — {{ user.profile.email }} reaches into nested objects.
Loops — {% for item in items %}- {{ item }}\n{% endfor %} repeats a block for each element.
Conditionals — {% if admin %}…{% elif staff %}…{% else %}…{% endif %}.
Filters — {{ name | upper }}, {{ items | join(', ') }}, {{ price | round(2) }}, and more.
JSON or YAML data — choose the data format, or leave it on auto to detect it.
Strict mode — turn on Strict to make a reference to a missing variable an error instead of rendering empty.

Output is not HTML-escaped, so the tool is equally useful for generating emails, config files, code, or any other text.

Example

Template:

Hello {{ name }}!
{% for item in items %}- {{ item }}
{% endfor %}

Data (JSON):

{"name":"Ada","items":["apples","bananas"]}

Output:

Hello Ada!
- apples
- bananas

Jinja2 vs. Handlebars / Mustache

Jinja2 uses {% ... %} for statements (loops, conditionals) and {{ ... }} for expressions, with a rich filter and expression system — a different language from the Handlebars/Mustache {{#each}} style. Pick the renderer that matches the template syntax you have.

FAQ

Why does a missing variable just render as nothing?

That's Jinja's default lenient behavior — an undefined reference like {{ typo_name }} produces an empty string. Turn on Strict mode and the same reference becomes an error instead, which is the safer setting when you're debugging a template that "mysteriously" outputs blanks.

How does the JSON/YAML auto-detection work — can it guess wrong?

On auto the tool tries JSON first, then YAML. Because almost every JSON document is also valid YAML, ambiguity is rare — but if your data is YAML that happens to parse as something unintended, force the format to yaml (or json) with the data-format option.

Is the output HTML-escaped?

No — what the template produces is exactly what you get, which makes the tool just as useful for emails, config files, and code as for markup. If you're generating HTML from untrusted data, apply escaping yourself (e.g. the | escape filter) where needed.

Can I use Jinja2 filters and nested data?

Yes. Filters like {{ name | upper }}, {{ items | join(', ') }} and {{ price | round(2) }} are supported, and dotted paths such as {{ user.profile.email }} reach into nested objects and lists from your JSON or YAML data.

Developer & Automation Access

Run it from the terminal

Same engine as this page, headless — via the gizza CLI:

gizza tool render-jinja2 "Hello {{ name }}!
{% for i in items %}- {{ i }}
{% endfor %}"

New to the CLI? Get gizza →

Open it by URL

Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:

https://gizza.ai/tools/render-jinja2/?template=Hello%20%7B%7B%20name%20%7D%7D%21%0A%7B%25%20for%20i%20in%20items%20%25%7D-%20%7B%7B%20i%20%7D%7D%0A%7B%25%20endfor%20%25%7D&data=%7B%22name%22%3A%22Ada%22%2C%22items%22%3A%5B%22a%22%2C%22b%22%2C%22c%22%5D%7D&data_format=auto&strict=true

Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.