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Jinja2 VS Preact.js

Compare Jinja2 VS Preact.js and see what are their differences

Jinja2 logo Jinja2

Jinja2 is a template engine written in Python.

Preact.js logo Preact.js

Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
  • Jinja2 Landing page
    Landing page //
    2023-09-24
  • Preact.js Landing page
    Landing page //
    2023-05-11

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.

Preact.js features and specs

  • Size
    Preact is very small in size (about 3KB gzipped), which makes it easy to load and faster to execute, resulting in improved performance and quicker load times.
  • Compatibility
    Preact is largely compatible with React, allowing developers to switch to Preact with minimal code changes. This makes it easier to adopt for projects already using React.
  • Performance
    Due to its small size and efficient design, Preact offers excellent performance, especially on low-powered devices and in applications with heavy user interactions.
  • Ecosystem
    Preact can work with many tools and libraries that are designed for React, giving developers access to a rich ecosystem of resources.
  • Community
    Preact has an active and growing community that provides support, plugins, and third-party tools, making it easier for developers to find solutions and share knowledge.

Possible disadvantages of Preact.js

  • Feature Set
    While Preact covers most of the core React features, it lacks some of the advanced functionality present in React, which may require additional workarounds or third-party libraries.
  • Learning Curve
    For developers coming from a non-React background, learning Preact might involve a learning curve, particularly because of its similarities and subtle differences with React.
  • Tooling Compatibility
    Although many tools designed for React can work with Preact, some might not be directly compatible, requiring additional configuration or patches.
  • Community Size
    While Preact has a supportive community, it is smaller compared to the massive React community, which can result in fewer available resources and third-party packages.
  • Maturity
    Preact, being newer and less widely adopted than React, might not have the same level of battle-tested reliability for all use cases, especially for large scale applications.

Jinja2 videos

Python and Jinja2 Cisco Network Automation

More videos:

  • Review - Python and Flask - Diving into Jinja2

Preact.js videos

JS frameworks are replaceable

Category Popularity

0-100% (relative to Jinja2 and Preact.js)
Javascript UI Libraries
29 29%
71% 71
Development
100 100%
0% 0
JavaScript Framework
0 0%
100% 100
Tool
100 100%
0% 0

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Jinja2 and Preact.js

Jinja2 Reviews

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Preact.js Reviews

Top JavaScript Frameworks in 2025
PreactJS is a JavaScript library that is said to be the fast 3Kb alternative to ReactJS using the same modern API. It implements the fastest virtual DOM compared to other frameworks in the market. Moreover, it is one of the smallest libraries in terms of size.
Source: solguruz.com
20 Next.js Alternatives Worth Considering
Preact is like React’s little sibling, smaller in size but with the same familiar moves. It’s cutting down the fluff and zipping through tasks with less overhead. When performance budgets are tight, Preact wiggles in perfectly.
20 Best JavaScript Frameworks For 2023
Preact is built with the same core principle of React – A component-based approach with Virtual DOM while completely compatible with React. It can even use React packages without compromising on speed, performance, and leaner size. In instances where the full potential of React isn’t necessary, most developers even use React during development and switch to Preact for...
Top 15 jQuery Alternatives To Know
ReactJS is a powerful JavaScript library to create user interfaces. Developers can design easy views at each stage in the application and there is regular update and rendering for the actual components whenever there is any data alteration. It is component-driven and creates encapsulated components that manage their own state.
Top 5 JavaScript Frameworks To Learn in 2021
But according to the graph above, we can notice a decrease in interest in Preact. This might result from having many similar frameworks with the same specs, like react-lite, Inferno, etc. However, knowing a framework like Preact will be useful for your development journey.
Source: enlear.academy

Social recommendations and mentions

Based on our record, Preact.js seems to be a lot more popular than Jinja2. While we know about 93 links to Preact.js, we've tracked only 4 mentions of Jinja2. 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.

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 / almost 4 years ago

Preact.js mentions (93)

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What are some alternatives?

When comparing Jinja2 and Preact.js, you can also consider the following products

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

Svelte - Cybernetically enhanced web apps

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

Vue.js - Reactive Components for Modern Web Interfaces

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

Inferno - An extremely fast React-like javascript library for building modern user interfaces.