Jinja2 Template Editor & Tester
Test, validate, and preview your Jinja2 templates in real-time with syntax highlighting, custom filters, and live output rendering
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Features
Live Preview
See your template changes rendered instantly as you type. No refresh needed.
Syntax Highlighting
Beautiful Monaco editor with full Jinja2 syntax highlighting and auto-completion.
Error Detection
Real-time validation highlights syntax errors and unclosed tags as you type.
Custom Filters
Includes reverse, slugify, currency, pluralise, markdown, timeago, and excerpt filters.
Template Library
Pre-built templates for common use cases to help you get started quickly.
Share & Export
Share templates via URL or export rendered output as HTML, text, or markdown.
How to Use This Jinja2 Editor
Write Your Template
Enter your Jinja2 template in the left editor. Use variables like {{ name }}, control structures like {% if condition %}, and filters like {{ text|upper }}.
Provide Context Data
Add JSON data in the context editor below the template. This data will be available as variables in your template.
View Rendered Output
The right panel shows your rendered template in real-time. Any errors will be displayed with helpful messages.
Export or Share
Click Export to download your rendered output as HTML, text, or markdown. Use Share to generate a URL with your template.
Frequently Asked Questions
What is Jinja2?
Jinja2 is a modern and designer-friendly templating language for Python. It's widely used in Flask, Django, Ansible, and other Python applications to generate dynamic HTML, configuration files, and documents.
What custom filters are available?
In addition to standard Jinja2 filters, we provide: reverse (reverse strings),slugify (URL-friendly slugs),currency (format currency),pluralise (singular/plural),markdown (basic markdown),timeago (relative time), and excerpt (smart truncation).
Can I use this for Django templates?
Yes! Django's template language is similar to Jinja2, though there are some differences in syntax and available filters. This tool uses Nunjucks (JavaScript implementation of Jinja2) which closely matches Jinja2 syntax.
Is my template data saved?
No, all template processing happens in your browser. Your templates and data are not sent to any server or stored anywhere. You can share templates using the Share button which generates a URL with your template encoded.
What's the difference between Jinja2 and Nunjucks?
Jinja2 is the original Python template engine, whilst Nunjucks is a JavaScript port with nearly identical syntax. This tool uses Nunjucks to run templates in your browser, but the syntax and features are compatible with Jinja2.
Can I test complex templates with loops and conditions?
Absolutely! The editor supports all Jinja2 features including for loops, if/elif/else statements, macros, blocks, filters, and template inheritance. Check the Template Library for examples.
Why Use an Online Jinja2 Template Tester?
Testing Jinja2 templates traditionally requires setting up a Python environment, installing dependencies, and writing test scripts. Our online Jinja2 editor eliminates this friction by providing an instant, browser-based testing environment with real-time preview.
Perfect for Python Developers
Whether you're building Flask applications, creating Ansible playbooks, or working with Django templates, this tool helps you quickly prototype and debug your templates without context switching.
Features for Template Development
- Instant Feedback: See template changes rendered immediately
- Error Highlighting: Catch syntax errors before deploying
- Auto-completion: Context-aware suggestions based on your JSON data
- Template Snippets: Quick insertion of common Jinja2 patterns
- Dark Mode: Comfortable editing in any lighting condition
Common Use Cases
Developers use this Jinja2 tester for email templates, HTML generation, configuration file templating, documentation generation, and testing template logic before integration into larger applications.