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Haml VS Jinja2

Compare Haml VS Jinja2 and see what are their differences

Haml logo Haml

HTML Abstraction Markup Language - A Markup Haiku

Jinja2 logo Jinja2

Jinja2 is a template engine written in Python.
  • Haml Landing page
    Landing page //
    2021-09-22
  • Jinja2 Landing page
    Landing page //
    2023-09-24

Haml features and specs

  • Readability
    Haml syntax is designed to be clean and indentation-based, which can lead to more readable code compared to standard HTML, especially in complex projects.
  • DRY Principle
    Haml encourages the DRY (Don't Repeat Yourself) principle by minimizing the need for closing tags and emphasizing reusable code snippets, reducing redundancy.
  • Embedded Ruby
    Haml allows seamless embedding of Ruby code, making it a powerful tool for developers working in Ruby environments, as logic and view are more closely intertwined.
  • Whitespace Sensitivity
    The indentation-based syntax reduces clutter by removing the need for explicit closing tags, curly braces, and other traditional HTML structure elements.
  • Maintaining Consistency
    The enforced indentation and structure positively guide developers towards structured and consistent code, which can be enforced across a team.

Possible disadvantages of Haml

  • Learning Curve
    Developers accustomed to traditional HTML might face a learning curve when first encountering Haml, due to its unique syntax and whitespace significance.
  • Whitespace Sensitivity
    The reliance on indentation and whitespace for code structure can lead to frustrating errors if the code is not indented correctly, causing potential debugging challenges.
  • Tooling and Support
    Haml might not be as widely supported by various IDEs and text editors compared to standard HTML or other templating languages, potentially hindering productivity.
  • Performance Overhead
    When rendering Haml templates, there might be a slight performance hit due to the processing needed to convert Haml into HTML.
  • Limited Adoption
    Haml is not as widespread as other templating languages, which might lead to fewer community resources, libraries, or plugins compared to more popular alternatives.

Jinja2 features and specs

  • Template Inheritance
    Jinja2 supports template inheritance, allowing developers to create base templates that can be extended by other templates, promoting reusability and reducing redundancy.
  • Easy to Use
    Jinja2 has a simple syntax that is easy to learn, making it accessible for developers with varying levels of experience.
  • Extensible
    Jinja2 can be easily extended with custom filters and tests, allowing developers to enhance its functionality to suit specific application needs.
  • Safe by Default
    The template engine auto-escapes variables to prevent cross-site scripting (XSS) attacks, enhancing security in web applications.
  • Sandboxed Environment
    Jinja2 runs code in a sandboxed environment, ensuring that user-inputted templates can be executed safely without compromising the server.

Possible disadvantages of Jinja2

  • Complex Logic Handling
    Jinja2 is not optimized for handling complex logic within templates, which can lead to messy and hard-to-maintain code if misused.
  • Limited Debugging
    Debugging Jinja2 templates can be challenging because error outputs are not always detailed, making it difficult to identify issues in large templates.
  • Performance Overhead
    Template rendering with Jinja2 might introduce performance overhead, which could impact the performance of heavily templated applications.
  • Learning Curve for Advanced Features
    While basic usage is simple, mastering Jinja2's advanced features, such as custom filters and macros, can have a significant learning curve.

Haml videos

How to Get Baby in Urdu&Hindi | Hamal Check krny ka Treeka | Haml Ghar Ma Chk Krain | Get B In Urdu

Jinja2 videos

Python and Jinja2 Cisco Network Automation

More videos:

  • Review - Python and Flask - Diving into Jinja2

Category Popularity

0-100% (relative to Haml and Jinja2)
Javascript UI Libraries
29 29%
71% 71
Development
21 21%
79% 79
Programming
100 100%
0% 0
Tool
0 0%
100% 100

User comments

Share your experience with using Haml and Jinja2. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, Haml should be more popular than Jinja2. It has been mentiond 19 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Haml mentions (19)

  • Douglas Hofstadter on Lisp (1983)
    I never suggested that I was the first person to think of this; not having dealt with any Lisp since (hmmm) 1990 via Scheme in my introductory CS 212 class at Cornell probably has something to do with my ignorance of the prior art in this area. I do like your approach of breadcrumbing me instead of giving me the answer, though... Best I can guess is "tooling" and simply that S-expressions are simply too embedded... - Source: Hacker News / 8 months ago
  • A RuboCop Configuration Tailored for Phlex
    Phlex takes a more Ruby-centric approach to generating HTML by using Ruby classes and methods instead of traditional template files like ERB or HAML. While this is great for reusability and code organization (And writing more Ruby 🤩), it can lead to long methods and classes, especially when building complex components or pages. Adding TailwindCSS into the mix further increases line lengths because of its... - Source: dev.to / 8 months ago
  • Building a syntax highlighting extension for VS Code
    First of all, I like Slim. I like the beauty and cleanness of Slim templates, to me they are way more readable than regular ERB templates and I think they fit in the ruby/Rails ecosystem very well. Slim is a close cousin to Haml, without the ugly percent characters, haha. I've used Slim exclusively in my projects since about 2016. - Source: dev.to / over 1 year ago
  • Hamlet: A type-safe Haml template engine for Go
    > I can't say what problem it is supposed to solve "Haml accelerates and simplifies template creation" https://haml.info/ If you'd rather write raw HTML, keeping track of closing tags etc, then don't use HAML. No need to bash it because you personally feel it is ugly or unnecessary. FWIW I personally feel the exact opposite. - Source: Hacker News / over 1 year ago
  • Hamlet: A type-safe Haml template engine for Go
    There is a better side by side of the syntax here https://haml.info (i've been using haml for 17 years lol, I find it more enjoyable to read and write). - Source: Hacker News / over 1 year ago
View more

Jinja2 mentions (4)

  • fetching list elements using jinja2 under flask app
    I have a list say list[a][b] of length 10.I want to print from list[0][b] to list[10][b] and use it in jinja2 template. Source: about 3 years ago
  • Jinja2: How to create multidimensional javascript array?
    I am using Flask with Jinja2 as templating language. Source: about 3 years ago
  • Issue a POST request with url_for in Flask
    I'm trying to issue a POST request within a Jinja template in Flask. However, parameters are passed in via GET by default, and this particular method only accepts POST requests. Source: about 3 years ago
  • Build a CRUD application with Flask and SQLAlchemy
    For our application above, we defined the string "My flask app" within our Python code. This was okay, as it was a single line, but as our front-end code grows, it will be cumbersome to define everything in our Python file. Flask allows for separation of concerns though so-called "templates." These are usually .html files, with some Python logic mixed in through the Jinja template engine language. Let's add a... - Source: dev.to / about 4 years ago

What are some alternatives?

When comparing Haml and Jinja2, you can also consider the following products

Handlebars - Handlebars is a JavaScript template library that is, more or less, based on ...

Pug - Pug is a robust, elegant, feature rich template engine for Node.js

Fortitude - Views Are Code: use all the power of Ruby to build views in your own language. - ageweke/fortitude

jquery-template - A template plugin for jQuery. Allows templating without cluttering JavaScript code with markup.

slm - Slim, Jade like template engine for node

NANO – jQuery Template Engine - NANO is a simple and open-source jQuery Template Engine developed by trix.pl and released under the MIT License.