Start the REPL

A REPL will run the project code every time we save files or evaluate expressions. This provides an instant feedback loop to ensure our application does what we think it should do.

Run the browser-repl using one of the following methods.

When you see the line Successfully compiled "resources/public/app.js" browse to http://localhost:3449 to see the running app.

It may take 10-30 seconds to start the repl, especially if libraries are to be downloaded. If nothing is displayed in your browser window, give it a few seconds and refresh the browser.


If you changed the :figwheel :server-port number in project.clj then you should use that number instead of 3449.

Using Spacemacs or Emacs & CIDER

Use the command clojurescript-jack-in and open a browser at http://localhost:3449

Configure Emacs to use browser-repl

Add the following elisp code to your .spacemacs (in dotspacemacs/user-config) or Emacs .init.el file to ensure the project (figwheel) runs the browser-repl rather than the default nashorn repl in the JVM.

(setq cider-cljs-lein-repl
      "(do (user/run)

Command Line & other editors

Open a terminal and type lein repl to start a Clojure REPL or start a REPL from your editor.

In the REPL, enter the following function calls then open a browser at http://localhost:3449



The call to (run) starts the Figwheel server at port 3449, which takes care of live reloading ClojureScript code and CSS. Figwheel's server will also act as your app server, so requests are correctly forwarded to the http-handler you define.

Running (browser-repl) starts the Figwheel ClojureScript REPL. Evaluating expressions here will only work once you've loaded the page, so the browser can connect to Figwheel.

When you see the line Successfully compiled "resources/public/app.js" in 21.36 seconds., you're ready to go. Browse to http://localhost:3449 and enjoy.

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