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taylorking/crow

Analysis updated 2026-08-11 · repo last pushed 2017-09-29

C++Audience · developerComplexity · 3/5DormantSetup · moderate

TLDR

Crow is a lightweight C++ web framework inspired by Python's Flask. It lets developers build fast web apps and APIs with simple routing, JSON support, and type-safe URL parameters.

Mindmap

mindmap
  root((repo))
    What it does
      Web apps in C++
      URL routing
      JSON support
      Dynamic web pages
    Tech stack
      C++
      Boost libraries
      Header-only
      WebSockets
    Use cases
      Gaming backends
      Real-time data feeds
      Lightweight APIs
      High-performance servers
    Audience
      C++ developers
      Performance-focused teams
    Key features
      Type-safe parameters
      Easy setup
      Low latency
      Minimal memory

Code map

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What do people build with it?

USE CASE 1

Build a high-performance API backend that handles thousands of requests per second.

USE CASE 2

Create a real-time gaming server using built-in WebSocket support.

USE CASE 3

Serve dynamic web pages with templating and JSON endpoints in a C++ project.

USE CASE 4

Build a lightweight, low-latency data feed service with minimal memory overhead.

What is it built with?

C++BoostWebSocketsJSONTemplating

How does it compare?

taylorking/crowabmfy/summertraining-homeworkachanana/mavsdk
LanguageC++C++C++
Last pushed2017-09-292022-07-112024-05-20
MaintenanceDormantDormantDormant
Setup difficultymoderatemoderatemoderate
Complexity3/52/54/5
Audiencedeveloperdeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires Boost C++ libraries and recommends specialized memory allocators like tcmalloc or jemalloc for best performance.

No license information was provided in the explanation, so the terms of use are unclear.

In plain English

Crow is a tool that lets programmers build web applications using C++. It is modeled after Flask, a popular Python framework known for being straightforward and minimal. The main appeal is giving developers the raw speed of C++ while keeping the coding experience simple, you can get a basic "Hello world" web server running in just a handful of lines of code. At its core, the project works by letting you define "routes," which are the URLs a website responds to. You tell it a URL like /hello and provide the code that should run when someone visits that address. It comes with built-in support for JSON (a common format for sending data between apps), templating for generating dynamic web pages, and even WebSockets for real-time communication. A standout feature is type-safety: if you declare that a URL should receive a number but write code expecting two numbers, the tool catches the mistake before the program ever runs. This is built for C++ developers who want to create fast web services or APIs without pulling in a massive, complex framework. For example, if a team is building a high-performance backend that needs to handle thousands of requests per second, like a gaming server, a real-time data feed, or a lightweight API, this gives them a lightweight way to do it. It is particularly attractive for projects where minimizing latency and memory usage is critical. A notable aspect of the project is that it is "header-only." In C++, this means a developer can get started just by dropping a single file into their project rather than going through a complicated installation process. The project does require some external dependencies, like the Boost C++ libraries, and recommends using specialized memory allocators (like tcmalloc or jemalloc) to maximize speed. The README notes that a built-in database tool was considered but ultimately dropped, suggesting developers pair it with a separate database library if needed.

Copy-paste prompts

Prompt 1
Help me set up a basic Crow C++ web server with a /hello route that returns 'Hello world', I want to use it as a starting point for a fast API backend.
Prompt 2
I am using the Crow C++ framework. Write a route that accepts a number in the URL like /add/5/3 and returns the sum as JSON, using type-safe parameters.
Prompt 3
Show me how to set up a WebSocket endpoint in Crow so I can push real-time updates to a browser client from my C++ server.
Prompt 4
I want to add Crow to my existing C++ project as a header-only file. Walk me through the setup including what Boost libraries I need and how to configure my build.

Frequently asked questions

What is crow?

Crow is a lightweight C++ web framework inspired by Python's Flask. It lets developers build fast web apps and APIs with simple routing, JSON support, and type-safe URL parameters.

What language is crow written in?

Mainly C++. The stack also includes C++, Boost, WebSockets.

Is crow actively maintained?

Dormant — no commits in 2+ years (last push 2017-09-29).

What license does crow use?

No license information was provided in the explanation, so the terms of use are unclear.

How hard is crow to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is crow for?

Mainly developer.

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