Best Web-Based Microframeworks of 2025

Flask is a lightweight WSGI framework for web applications. It's easy to use and can scale up to complex applications. It started as a wrapper for Jinja and Werkzeug, and has since grown to be one of the most popular Python web app frameworks. Flask is a suggestion tool that doesn't require any dependencies. The developer can choose the tools and libraries that they prefer. The community has many extensions that make it easy to add new functionality.

Express is a lightweight and flexible Node.js framework that offers a wide range of features for mobile and web applications. It is easy to create a robust API using a variety of HTTP utility methods and middleware. Express offers a thin layer that covers the core web application features without obscuring the Node.js features you already love. Express does not have any notion of a database. Third-party Node modules allow you to interface with almost any database. Express does not recognize 404 responses as errors and will not capture them. This is because a response of 404 indicates that there is no additional work to be done. Express has executed all middleware functions, routes, and found none of them to be responsive.

Express's new web framework Koa was created by the team behind Express. It aims to be a smaller and more expressive web framework that can be used to build web applications and APIs. Koa leverages async functions to eliminate callbacks and improve error handling. Koa doesn't bundle any middleware in its core. It provides an elegant suite that makes writing servers fast and fun. A Koa application is an object that contains a collection of middleware functions. These functions are composed and executed in a stack-like fashion upon request. Koa is similar in design to Ruby's Rack and Connect. However, Koa provides high-level "sugar", at the low-level middleware layer. This increases interoperability and robustness and makes middleware writing much more enjoyable.

High-performance, extensible, minimalist Go web framework. Highly optimized HTTP router that uses zero dynamic memory allocation and intelligently prioritizes routes. Build a robust and scalable API that can be easily organized into different groups. Install TLS certificates automatically from Let's Encrypt. HTTP/2 support increases speed and improves user experience. You can choose from a variety of middlewares that are already built-in, or you can define your own. Middleware can either be set at the root, group or route level. Data binding for HTTP payloads, including JSON or XML. API to send a wide variety of HTTP responses including JSON, XML or HTML, as well as file, attachment, stream, blob, inline or blob. Template rendering with any template engine. Customized central HTTP error handling. API that is easily extendable. HTTP router optimized to prioritize routes intelligently. Build robust, scalable RESTful APIs. Extensible middleware framework. Define middleware on a root, group or route level. Data binding for JSON XML and form payload.

Bit is a collaborative and scalable way to create and reuse components. It provides everything you need, from local development to cross-project integrations. It's free to try. Bit is an open-source toolchain that allows for component-driven development. Distribute composable software instead of monolithic apps. Distribute component ownership across development teams. Components are simple to replace and refactor. Develop consistency and standards across products and teams. Instead of reinventing the wheel, combine existing components to create new ones. Create a reusable design system and UI. Develop a consistent and reusable UI system. Code and teams should be distributed. Encourage autonomy and standardization. Scale to cross-team collaboration. This will bridge the gap between product design, development, and design. A composable and scalable backend that doesn't repeat itself is possible.

It is based upon the concept of Model,View and Controllers. The framework is designed with a clean style in mind, which results in code that can be maintained for a long time. Other popular frameworks are designed with the mindset of launching quickly. This leads to code that is easy to deploy, but becomes complex after several iterations. Apache or gunicorn is an example of a control process. When the controller process is started, it receives a manifest. All requests sent to the controller process are routed to the program in the manifest. A manifest is a collection of programs. A user sends a request to a controller process. This can be either a web request or a command-line invocation or any other action handled by a Controller Process.

API development is dramatically simplified by using multiple interfaces. With hug, you can design and develop an API once, and then expose it to your clients in the way they need. Hug is the fastest way to create Python3 APIs, whether you want to do it locally, via HTTP or on the command line. Hug has been designed with performance in the forefront of its mind. It is designed to only consume resources when needed and is compiled with Cython for amazing performance. Huge is one of the fastest Python Frameworks. It is also the fastest high-level Python 3 framework. With hug, you can specify which versions or ranges of versions your API supports. This will then be enforced and communicated automatically to the API's users.

CherryPy lets developers build web applications the same way as they would any other object-oriented Python programme. This allows for smaller source code to be developed in less time. CherryPy has been around for more than ten year and has proven to be reliable and fast. Many sites, from the most basic to the most demanding, use it in production. To get the most out of CherryPy you should begin with the tutorials which will guide you through the most important aspects of the framework. After you have completed the tutorials, you may want to look at the advanced and basic sections to see how certain operations are implemented. You will also want to read the configuration and extension sections, which go into detail about the powerful features of the framework.

Bottle is a lightweight, fast and simple WSGI micro-web framework for Python. It is distributed in a single module file and does not have any dependencies except for the Python Standard Library. Support for clean and dynamic URLs. Requests to function call mapping. Built-in template engine that is fast and pythonic, and supports mako2, jinja2 or cheetah. Access to form data, file uploads cookies, headers, and other HTTP metadata. Built-in HTTP Development Server and support for paste bjoern gae cherrypy or other WSGI capable HTTP servers.

Javalin is a very simple framework. It has very few concepts to learn. You never extend classes, and you rarely implement an interface. Javalin is a few thousand lines on top of Jetty and its performance is the same as raw Jetty code. It's easy to understand the source code due to its size. Other Java and Kotlin frameworks offer one version per language. Javalin was designed with interoperability as a priority. Apps are built in the same way for Java and Kotlin. Javalin is built on Jetty, the most popular and stable web server on the JVM. You can configure Jetty to include SSL, HTTP3, and everything else it offers.

FastAPI is an advanced web framework that allows you to build APIs using Python 3.7+. It uses standard Python type hints. Fast: Very high-performance, on par with NodeJS or Go (thanks Pydantic and Starlette). One of the fastest Python Frameworks available. Reduce code duplication and get multiple features out of each parameter declaration.

Falcon is a minimalist Python web API Framework for building robust microservices and app backends. The framework is compatible with both ASGI and gevent/meinheld. The Falcon web framework promotes REST architecture. Resource classes implement HTTP handlers to resolve requests and perform transitions. Falcon is a complement to more general Python webframeworks by adding extra reliability, flexibility and performance where you need it. You can use a number of Falcon templates, add-ons and complementary packages in your projects. You can find a few of these on the Falcon Wiki as a start, but you might also want to search PyPI for more resources.

Sinatra has a number built-in settings which control the activation of certain features. The settings object is a request context object that contains application-level variables. These variables can be modified by using the set, disable, or enable methods. Applications can set their own custom settings, as well as default built-in framework settings. In its simplest form the set method creates an application attribute by taking a setting value and name. Extensions provide helper methods or class methods to Sinatra applications. These methods are usually listed and described in the extension home pages. Installing a gem, library or a file is all that's needed to use an extension.

A Ruby framework that allows you to create REST-like APIs.

Create asynchronous server and client applications. Simple and easy to use, you can create anything from microservices up to multiplatform HTTP clients. Open Source, fun, and free! Ktor was built from the ground-up using Kotlin. You can use a multiplatform, concise language with asynchronous programming and an intuitive imperative flow. Ktor lets you use only the features you need and structure your application in the way you want. You can also easily extend Ktor by adding your own plugin. JetBrains is the creators of IntelliJ IDEA and Kotlin. JetBrains uses Ktor internally as well as with our customers. You also get top-notch support for your tooling!

Slim is a great tool for creating APIs that consume data, repurpose it, or publish it. Slim is a great tool to create rapid prototypes. You can even create full-featured web apps with user interfaces. Slim is also super fast and requires very little code. You don't need to use a solution that has everything like Symfony and Laravel. These are excellent tools, no doubt. They are often overkill. Slim offers a minimal set that does exactly what you need. You will need a webserver like Nginx, Apache or similar. Slim apps contain routes that respond to HTTP requests. Each route calls a callback, and returns an HTTP reply. To get started you must first configure and instantiate the Slim application. Next, you define your application routes.