erlyaws/yaws

Health v2 · maintenance only

Adoption not part of the score

1312 stars · 272 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Yaws is a high-performance HTTP 1.1 webserver written entirely in Erlang, particularly well suited for dynamic-content web applications. It can operate in standalone mode as a regular webserver daemon or in embedded mode inside another Erlang application, handling each client with a lightweight Erlang process.

Use cases

• serve dynamic web content from an Erlang application
• run a high-concurrency HTTP server on the BEAM
• embed a web server inside an existing Erlang/OTP app
• host websockets or server-sent events in Erlang
• build Erlang web apps with appmods instead of a separate app server
• self-host a lightweight webserver daemon on Linux

When to choose

• your codebase is Erlang/OTP 25+ and you want the web layer in the same VM
• you need very high client concurrency with one process per connection
• you want an embeddable webserver for an OTP application rather than a reverse-proxied external server
• you value a mature, long-maintained Erlang-native webserver with websocket and SSE support

When to avoid

• you need HTTP/2 or advanced proxying features found in Nginx/Caddy
• your application stack is not Erlang/Elixir-centric
• you develop or deploy primarily on Windows
• you rely on a large plugin/module ecosystem or commercial-grade support

Facets

application · maturity stable

http-server websocket templating web-development backend bsd self-hosted erlang otp webserver http-1-1 dynamic-content embedded-webserver server-sent-events appmods appmod bsd-3-clause rebar3 high-concurrency linux macos web-server

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markdown · JSON · MCP: product_card(name="erlyaws/yaws")