The Clojure Interactive Development Environment that Rocks for Emacs
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License GPL 3 MELPA MELPA Stable Build Status Gitter

Gratipay Team OpenCollective OpenCollective Paypal


CIDER is the Clojure(Script) Interactive Development Environment that Rocks!

CIDER extends Emacs with support for interactive programming in Clojure. The features are centered around cider-mode, an Emacs minor-mode that complements clojure-mode. While clojure-mode supports editing Clojure source files, cider-mode adds support for interacting with a running Clojure process for compilation, debugging, definition and documentation lookup, running tests and so on.

CIDER is the successor to the now deprecated combination of using SLIME + swank-clojure for Clojure development.

Please consider supporting financially its ongoing development.


The instructions that follow are meant to get you from zero to a running CIDER REPL in under 5 minutes. See the official manual for (way) more details.


The recommended way to install CIDER is via package.el - the built-in package manager in Emacs.

CIDER is available on the two major package.el community maintained repos - MELPA Stable and MELPA.

You can install CIDER with the following command:

M-x package-install [RET] cider [RET]

Launch an nREPL server and client from Emacs

Simply open in Emacs a file belonging to your lein or boot project (like foo.clj) and type M-x cider-jack-in. This will start an nREPL server with all the project dependencies loaded in and CIDER will automatically connect to it.

Alternatively you can use C-u M-x cider-jack-in to specify the name of a lein or boot project, without having to visit any file in it.

In Clojure(Script) buffers the command cider-jack-in is bound to C-c M-j.

Connect to a running nREPL server

You can go to your project's directory in a terminal and type there (assuming you're using Leiningen that is):

$ lein repl

Or with Boot:

$ boot repl -s wait

Alternatively you can start nREPL either manually or by the facilities provided by your project's build tool (Gradle, Maven, etc).

After you get your nREPL server running go back to Emacs. Typing there M-x cider-connect will allow you to connect to the running nREPL server.

In Clojure(Script) buffers the command cider-connect is bound to C-c M-c.

Diving Deeper

CIDER packs a ton of functionality and you really want to be familiar with it, so you can fully empower your workflow. The best way to get acquainted with all available features is to go over the entire CIDER manual.

If you're into video lessons, you might also check out this intro to CIDER demo as well.


An extensive changelog is available here.


The Core Team

The direction of the project is being stewarded by the CIDER core team. This group of long-term contributors manage releases, evaluate pull-requests, and does a lot of the groundwork on major new features.

CIDER Alumni

In addition, we'd like to extend a special thanks the following retired CIDER core team members. Lovingly known as The Alumni:

Release policy

We’re following SemVer (as much as one can be following it when the major version is 0). At this point bumps of the minor (second) version number are considered major releases and always include new features or significant changes to existing features. API compatibility between major releases is not a (big) concern (although we try to break the API rarely and only for a good reason).

The development cycle for the next major release starts immediately after the previous one has been shipped. Bugfix/point releases (if any) address only serious bugs and never contain new features.

The versions of CIDER and cider-nrepl are always kept in sync. If you're tracking the master branch of CIDER, you should also be tracking the master branch of cider-nrepl.


CIDER's logo was created by @ndr-qef. You can find the logo in various formats here.

The logo is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.


While CIDER is free software and will always be, the project would benefit immensely from some funding. Raising a monthly budget of a couple of thousand dollars would make it possible to pay people to work on certain complex features, fund other development related stuff (e.g. hardware, conference trips) and so on. Raising a monthly budget of over $5000 would open the possibility of someone working full-time on the project which would speed up the pace of development significantly.

We welcome both individual and corporate sponsors! We also offer a wide array of funding channels to account for your preferences (although currently Open Collective is our preferred funding platform).

If you're working in a company that's making significant use of CIDER we'd appreciate it if you suggest to your company to become a CIDER sponsor.

You can support the development of CIDER, clojure-mode and inf-clojure via Open Collective, Salt, Gratipay and PayPal.

Support via Gratipay


Open Collective Backers

Open Collective Sponsors

Become a sponsor and get your logo on our README on Github with a link to your site. [Become a sponsor]


Copyright © 2012-2017 Tim King, Phil Hagelberg, Bozhidar Batsov, Artur Malabarba and contributors.

Distributed under the GNU General Public License, version 3