A high performance Lua web server with a simple, powerful API. See the full documentation here.


Heart combines Go’s fasthttp with LuaJIT to create an insanely fast Lua web server.

It also comes with a performant key-value store API backed by BadgerDB that can store data both in memory and on disk.


  • High throughput
  • Low latency
  • Fast K/V store
  • Versioned API
  • Stable Lua 5.1 VM
  • Structured logs

Getting Started

  • Create a Lua file that uses the Heart API
-- main.lua
app = require('heart.v1')

app.get('/:name', function(ctx)
  return 'Hello, ' .. ctx.pathParam('name') .. '!'
  • Run Heart with Docker and point it at your Lua docker run -v $(pwd):/root/app -p 3333:3333 hyperspacelogistics/heart:latest app/main.lua
  • curl localhost:3333/world to see the result
  • Congratulations you’re running a wicked fast Lua server



Each stack was tasked with rendering {"hello": "world"} through their JSON stack in production mode, if applicable, with logging disabled. wrk was used with the command wrk -t32 -c512 -d30s http://localhost:3333. All benchmarks were performed on a CPU-optimized DigitalOcean droplet that had 32vCPUs and 64 GB of RAM.


Global state, like with any parallel web server, is highly discouraged. For performance reasons Heart keeps a pool of Lua state to reuse in subsequent requests. State is reused in a random order and therefore global state that is modified in requests is functionally random in Heart. Be cautious! Static global state, like the app variable, is the exception and can generally be treated as safe.