A Fast and Easy to use microframework for the web.

Crow is a C++ framework for creating HTTP or Websocket web services. It uses routing similar to Python's Flask which makes it easy to use. It is also extremely fast, beating multiple existing C++ frameworks as well as non C++ frameworks.

Blazingly Fast

Header Only

Typesafe handlers

Websocket Support

Easy to get started

#include "crow.h"

int main()
    crow::SimpleApp app;

    CROW_ROUTE(app, "/")([](){
        return "Hello world";

CROW_ROUTE(app, "/json")
    crow::json::wvalue x({{"message", "Hello, World!"}});
    x["message2"] = "Hello, World.. Again!";
    return x;

JSON Support Built-in

URL parameter support as well!

([](int count){
    return crow::response(std::to_string(count));

Support Crow

Crow is provided free of charge courtesy of everyone who is donating their money, time, and expertise to keep it going.

Help us make something great!

Fund Crow Develop Crow Chat with us

Get Crow

Crow is everywhere, you just need to grab it!

Learn Crow

The 1000 mile journey begins with a single step. Get started by installing Crow and building you first application. Or go through the guides if you're stuck somewhere.

Get Started Guides API Reference