Chestnut is a Leiningen template for a ClojureScript app based on Om, featuring a great dev setup, and easy deployment.

For smooth development you get instant reloading of Clojure, ClojureScript, and CSS. A browser-connected REPL is also included.

For deployment you get uberjar support, meaning you can get all your code compiled, optimized, and packaged in a single executable JAR file. It also contains the necessary artifacts to work on Heroku out of the box.

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Chestnut 0.9.0-SNAPSHOT

A major update is in the works. To try it out, use lein new chestnut my-project --snapshot.

  • Use Figwheel for REPL and Ring server
  • Remove boilerplate that's no longer needed
  • Drop Enlive and simplify the dev setup
  • Drop CLJX support
  • Better inline documentation


lein new chestnut <name>

After that open the README of your generated project for detailed instructions.

Command line

$ lein repl


Wait a bit, then browse to http://localhost:10555.


Lighttable provides a tighter integration for live coding with an inline browser-tab. Rather than evaluating cljs on the command line with weasel repl, evaluate code and preview pages inside Lighttable.

Steps: After running (run), open a browser tab in Lighttable. Open a cljs file from within a project, go to the end of an s-expression and hit Cmd-ENT. Lighttable will ask you which client to connect. Click 'Connect a client' and select 'Browser'. Browse to http://localhost:10555

View LT's console to see a Chrome js console.

Hereafter, you can save a file and see changes or evaluate cljs code (without saving a file). Note that running a weasel server is not required to evaluate code in Lighttable.


Start a repl in the context of your project with M-x cider-jack-in.

Switch to repl-buffer with C-c C-z and start web and figwheel servers with (run), and weasel server with (browser-repl). Load http://localhost:10555 on an external browser, which connects to weasel, and start evaluating cljs inside Cider.

List of Contents

This template gives you everything you need to start developing Clojure/ClojureScript apps effectively. It comes with

  • Figwheel Automatically reload your ClojureScript and CSS as soon as you save the file, no need for browser refresh.
  • Om ClojureScript interface to Facebook's React.
  • Ring Clojure's de facto HTTP interface. Chestnut uses a Jetty or HttpKit server to serve the Clojurescript app. This way you already have an HTTP server running in case you want to add server-side functionality. Chestnut also inserts a Ring middleware to reload server-side Clojure files.
  • Heroku support. Chestnut apps have all the bits and pieces to be deployable to Heroku. Getting your app on the web is as simple as git push.
  • Unit tests for both Clojure and CLJS. Or you can decide to use Speclj instead, both for CLJ and CLJS. Both specs and CLJS tests can be run in "auto" mode.


  • --http-kit Use HTTP Kit instead of Jetty
  • --site-middleware Use the middleware (session, CSRF), instead of ring.middleware.defaults.api-defaults (see ring.defaults documentation)
  • --om-tools Use Prismatic's om-tools.dom instead of om.dom
  • --less Use less for compiling Less CSS files.
  • --speclj Use speclj test runner for clj and cljs, and disable the core cljs.test tests.

Use -- to separate these options from Leiningen's options, e.g. lein new chestnut foo -- --om-tools --http-kit

Local copy

If you want to customize Chestnut, or try unreleased features, you can run directly from master like this:

git clone
cd chestnut
lein install

Note that master may be partially or wholly broken. I try to do extensive manual testing before releasing a new stable version, so if you don't like surprises then stick to the version on Clojars. Issue reports and pull requests are very welcome.

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