How to set up Crow in a C++ project?

Crow is header-only, so just include the 'crow.h' file. The documentation on crowcpp.org provides setup steps for build systems like CMake, making integration straightforward for various project types.

Crow vs Drogon: which is better for performance?

Both are high-performance C++ frameworks, but Crow emphasizes Flask-like simplicity while Drogon offers more features like an ORM. Benchmarks in Crow's README show it excels in speed, but Drogon might be better for complex applications needing built-in tools.

How to handle JSON requests in Crow?

Crow has built-in JSON support without external dependencies. Use crow::json::load to parse request bodies, as shown in the example, allowing easy extraction and manipulation of JSON data for APIs.

Does Crow support WebSocket?

Yes, Crow supports WebSocket alongside HTTP/1.1, enabling real-time applications. The framework provides a unified approach to handle both protocols, though detailed examples are in the documentation.

How to add middleware in Crow?

Crow supports middleware for extensions via custom classes. You can intercept requests and responses, but implementation details are sparse in the README; refer to the official documentation for examples and best practices.

Is Crow production-ready?

Crow is actively developed with strong performance benchmarks, but features like async and HTTP/2 are incomplete. It's suitable for many use cases, but evaluate based on specific project needs and the roadmap.

Open-Awesome

Crow

NOASSERTIONC++v1.3.4

A fast and easy-to-use C++ microframework for creating HTTP and WebSocket web services.

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5.0k stars553 forks0 contributors

What is Crow?

Crow is a C++ microframework for creating fast and scalable HTTP and WebSocket web services. It provides an easy-to-use routing system similar to Python's Flask, enabling developers to quickly build APIs and real-time applications with minimal boilerplate. The framework is designed for high performance, often exceeding other C++ and non-C++ solutions in speed benchmarks.

Target Audience

C++ developers building web services, REST APIs, or real-time applications who value performance and simplicity. It's ideal for those familiar with Flask-like routing who want to leverage C++'s speed without sacrificing developer experience.

Value Proposition

Developers choose Crow for its combination of Flask-inspired ease of use and C++-level performance. Its header-only design, type-safe handlers, and built-in JSON support reduce setup time and errors, while benchmarks demonstrate its speed advantage over alternatives.

Overview

A Fast and Easy to use microframework for the web.

Use Cases

Best For

Building high-performance REST APIs in C++
Creating real-time applications with WebSocket support
Developing microservices with minimal dependencies
Prototyping web services quickly with Flask-like syntax
Integrating web servers into existing C++ applications
Projects requiring compile-time type safety for API endpoints

Not Ideal For

Projects requiring HTTP/2 support immediately
Applications that heavily rely on asynchronous programming patterns
Teams preferring languages with larger web development ecosystems, like Python or JavaScript

Pros & Cons

Pros

Intuitive Flask-like Routing

The routing syntax is directly inspired by Python's Flask, making API endpoint definition straightforward and reducing boilerplate code, as shown in the Hello World example.

Compile-Time Type Safety

URL parameters are type-checked at compile time, preventing runtime errors; the README includes an example where mismatched handler types cause a compile error.

Exceptional Performance

Benchmarks linked in the README demonstrate that Crow outperforms other C++ and non-C++ frameworks, leveraging C++'s efficiency for high-speed web services.

Header-Only Simplicity

Available as a single header file, Crow simplifies project integration without complex build systems, reducing dependency management overhead.

Cons

Incomplete Feature Set

The README explicitly notes that async support and HTTP/2 support are still in development, limiting its suitability for modern web applications requiring these features.

Modern C++ Requirement

Relies on C++11/14 features, which may not be supported in all environments and can be a barrier for developers unfamiliar with modern C++ standards.

Limited Third-Party Ecosystem

As a C++ microframework, it has a smaller community and fewer pre-built extensions compared to more established web frameworks in languages like Python or Node.js.

Frequently Asked Questions

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