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A flexible dev server for Elm
Live reload included!





# Globally for a user: 
npm install --global elm elm-live
# …or locally for a project: 
npm install --save-dev elm elm-live

If you’d rather bring your own global elm-make, npm install --global elm-live will do.

Note that you need node 6.0+ to run the tool natively. But if you’re stuck on an older version, don’t worry! Rumour has it that you can transpile the code to ES5!



elm-live [...<options>] [--] ...<elm-make args>  
elm-live --help



First, we spawn elm-make with the elm-make args you’ve given.

When the build is ready, we start a static HTTP server in the current directory. We inject a live reload snippet into every HTML file we serve. Every time a static file has changed, we’ll reload your app in all browsers you’ve opened it with. (Mobile and IE included!)

We also watch all *.elm files in the current directory and its subdirectories. Whenever you change, add or remove one of them, we’ll rebuild your program and reload the page.




Set the port to start the server at. If the port is taken, we’ll use the next available one. PORT should be a valid port number. Default: 8000.


An absolute or relative path to elm-make. If you’ve installed elm-platform locally with npm (npm install --save-dev elm), you’ll likely want to set this to node_modules/.bin/elm-make. Default: elm-make.


Set the host interface to attach the server to. Default: localhost.


The base for static content. Default: ..


We’ll open the app in your default browser as soon as the server is up.


When elm-make encounters a compile error, we keep elm-live running and give you time to fix your code. Pass --no-recover if you want the server to exit immediately whenever it encounters a compile error.


Serve index.html on 404 errors. This lets us use client-side routing in Elm. For instance, we can have a URL like http://localhost:8000/account get handled by the Elm navigation package instead of failing with a 404 error.


Run EXECUTABLE before every rebuild. This way you can easily use other tools like elm-css or browserify in your workflow.

Heads up! At the moment, we only allow running a single executable without parameters. If you need more than that, please give us a shout at


Just like --before-build, but runs after elm-make.


You’re looking at it.



The simplest scenario:

$ elm-live Main.elm --open

Custom HTML file:

$ cat <<——— > index.html
  <!doctype html>
  <link rel="stylesheet" href="style.css" />
    <script src="elm.js"></script> 
$ elm-live Main.elm --output=elm.js --open

Support client-side routing in Elm:

$ elm-live Main.elm --open --pushstate



my app is not getting reloaded

Your HTML file must have an explicit <body> tag, so that we know where to inject a LiveReload snippet.

I’m seeing a SyntaxError about block-scoped declarations

If you’re seeing one of these:

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

make sure you’re running on node 6+. If you can’t upgrade, consider transpiling source/elm-live.js to ES5.

By the way, yarn should be warning you about installing incompatible packages. To get the same behavior in npm, set the engine-strict flag.



Many thanks to Evan Czaplicki, the creator of Elm, for – the most brilliant language compiler the world has ever seen! Without elm-make, elm-live would be a car without an engine.

Many thanks to Matt DesLauriers for the wonderful That’s what does the heavy lifting on the static server side.

Warm thanks to our amazing contributors! Credits to Brian for making Windows support possible, Kurt for allowing a configurable --host and Josh for his work on enabling client-side navigation. Thanks to Ryan batch updates are nice and fast. Kudos to Mathieu, Rémy and Nicolas for making the developer experience smoother and to Gabriel for the --before-build option. Many thanks to Noah for making sure elm-live works smoothly with elm-test.



MIT © Tomek Wiszniewski