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Practicalli Clojure deps.edn user wide configuration for Clojure projects

License CC By SA 4.0 GitHub Sponsors for practicalli-john clj-kondo GitHub action MegaLinter

Practicalli Clojure deps.edn by Practicalli is licensed under CC BY-SA 4.0

User level configuration for Clojure CLI

practicalli/clojure-deps-edn adds community libraries and tools to use with all Clojure CLI projects or as stand-alone tools. Aliases use qualified descriptive names to avoid clashes with project specific aliases, ensuring that the user wide aliases remain available in all projects.

Common default arguments are included in an alias via :exec-args to minimise the cognitive load required to use aliases.

The Practicalli Clojure book uses this configuration extensively to help you develop Clojure projects and learn the Clojure language. Initial inspiration taken from seancorfield/dot-clojure.


Install Practicalli clojure-deps-edn

Clojure CLI version 1.11.1.xxxx or later is recommended. Check the version of Clojure CLI currently installed via:

clojure -Sdescribe

Practicalli guide to installing Clojure has detailed instructions to install Clojure CLI for a specific operating system, or follow the Getting Started page.

When Clojure CLI runs for the first time a configuration directory is created in $XDG_CONFIG_HOME/clojure or $HOME/.clojure if XDG_CONFIG_HOME not set

Practicalli recommends setting $XDG_CONFIG_HOME to $HOME/.config

Backup or delete the Clojure CLI configuration directory if it exists

Clone practicalli/clojure-deps-edn repository (or create a fork and clone that instead)

git clone $XDG_CONFIG_HOME/clojure

If $XDG_CONFIG_HOME not set, then use git clone $HOME/.clojure

The deps.edn file in the Clojure CLI configuration directory contains all the Practicalli aliases, which are available from any Clojure CLI project for the current user account.

Windows support: Windows Sub-system for Linux (WSL) is strongly encouraged. Aliases should also work on Powershell or cmd.exe, although escape quoting of additional arguments may be required.

Location of local Maven repository

$HOME/.m2/repository is the default location of the local maven repository, the directory where library dependency jar files are cached.

:mvn/local-repo is a top-level key to set the local maven repository location, such as $HOME/.cache/maven/repository to follow the XDG specification. If setting :mvn/local-repository, consider moving the contents of $HOME/.m2/repository to the new location to avoid downloading currently cached jar files (or use this as an opportunity to clear out the cache).

Updating Practicalli clojure-deps-edn

The collection of aliases is regularly reviewed and additional alias suggestions and PRs are most welcome.

The versions of libraries are updated at least once per month using the :project/outdated alias, updating the deps.edn file. The antq tool is used to report new library versions, sent to an org file which is then used to update the changelog.

cd $XDG_CONFIG_HOME/clojure
clojure -T:search/outdated >

Pull Requests from :search/outdated cannot be accepted unless full testing of every change can be demonstrated

Using Practicalli clojure-deps-edn

Any directory containing a deps.edn file is considered a Clojure project. A deps.edn file can contain an empty hash-map, {} or hash-map with configuration, usually :paths and :dependencies and perhaps some :aliases.

The project deps.edn file is merged with the user wide configuration, e.g $HOME/.clojure/deps.edn, with the project deps.edn keys taking precedence if there is duplication, otherwise they are merged.

Configuration passed via the command line when running clojure or the clj wrapper will take precedence over the project and user level configuration if there is duplication, otherwise they are merged.

Clojure CLI tools deps.edn configuration precedence

See the rest of this readme for examples of how to use each alias this configuration contains.

Common development tasks

How to run common tasks for Clojure development.

  • Built-in tasks require no additional configuration.
  • User aliases should be added to ~/.clojure/deps.edn.
  • Project aliases should be added to the individual project deps.edn file (or may be part of a template).
  • User/Project alias can be defined in both user and project deps.edn files (add to project deps.edn for Continuous Integration)
Task Command Configuration
Create project (clojure exec) clojure -T:project/new :template app :name practicalli/my-app User alias
Run REPL (rebel readline with nrepl server) clojure -M:repl/rebel User alias
Run ClojureScript REPL with nREPL (editor support) clojure -M:repl/cljs-nrepl User alias
Download dependencies clojure -P (followed by optional aliases) Built-in
Find libraries (Clojars & Maven Central) clojure -M:search/libraries library-name(s) User alias
Find available versions of a library clojure -X:deps find-versions :lib domain/library-name Built-in
Resolve git coord tags to shas and update deps.edn clojure -X:deps git-resolve-tags git-coord-tag Built-in
Generate image of project dependency graph clojure -T:project/graph-deps User alias
Check library dependencies for newer versions clojure -T:search/outdated User alias
Run tests / watch for changes clojure -X:tests/run / clojure -X:test/watch User/Project alias
Run the project (clojure.main) clojure -M -m domain.main-namespace Built-in
Run the project clojure -X:project/run Project alias
Package library clojure -X:project/jar User/Project alias
Deploy library locally (~/.m2/repository) clojure -X:deps mvn-install :jar '"project.jar"' Built-in
Package application clojure -X:project/uberjar User/Project alias

Add alias :project/run to the deps.edn file in the root of a project:

:project/run {:exec-fn domain.namespace/-main}

Watch: Clojure CLI - practicalli/clojure-deps-edn community tools to see some of these in action


Aliases provide additional configuration when running a REPL, an application or to use a community tool.

  • add or remove dependencies
  • add or remove directories on the class path
  • define a function or main namespace to run, along with arguments

Clojure CLI main flag options

Flag Purpose Config used
-M Run Clojure project with clojure.main deps, path, :main-opts & command line args
-P Prepare / dry run (CI servers, Containers) deps, path
-P -M:aliases Prepare / dry run including alias deps and paths deps, path
-P -X:aliases Prepare / dry run including alias deps and paths deps, path
-X Execute a qualified function, optional default arguments deps, path, :exec-fn, :exec-args & :key val args
-T Run a tool or alias separate from a project classpath :exec-fn, :exec-args & :key val args
-J Java Virtual Machine specific options (memory size, etc)
  • deps = :deps, :extra-deps or replace-deps
  • path = :path, :extra-paths or replace-paths

REPL terminal UI

Run an interactive REPL on the command line with the simple REPL UI or Rebel readline for a feature rich REPL experience.

nREPL server is started by default, so that editors and other command line sessions can connect to the same REPL.

See Middleware aliases to run a headless REPL process without a REPL UI

Use the :env/dev alias with the :repl aliases to include dev/ in classpath and configure REPL startup actions using dev/user.clj

Command Description
clojure -M:repl/rebel Rich terminal UI Clojure REPL using Rebel Readline
clojure -M:env/dev:repl/rebel As above, including :extra-deps and :extra-path from :env/dev alias
clojure -M:repl/rebel-cljs Rich terminal UI ClojureScript REPL using Rebel Readline
clojure -M:repl/rebel-reveal Rich terminal UI Clojure REPL using Rebel Readline and Reveal data inspector

:repl/help in the Rebel UI for help and available commands. :repl/quit to close the REPL.

Data Inspectors section defines :inspect/reveal alias for a Reveal REPL with visualization, along with other data visualization tools.

REPL with Editor

Run an interactive REPL on the command line with the simple terminal UI, including an nREPL server and Cider libraries to support connections from Clojure editors, e.g. Conjure, CIDER and Calva.

Command Description
clojure -M:repl/nrepl Clojure REPL with nREPL server for editor support
clojure -M:repl/cljs-nrepl ClojureScript REPL with nREPL for editor support
clojure -M:repl/cider Clojure REPL with nREPL server and Cider-nrepl
clojure -M:repl/cider-refactor Clojure REPL with nREPL server, Cider-nrepl and clj-refactor
clj -M:repl/reveal-nrepl Clojure REPL with Reveal data visualization and nREPL interactively
clj -M:repl/reveal-light-nrepl Clojure REPL with Reveal data visualization (light theme) and nREPL interactively

Hotload libraries into a running REPL

Use the :lib/hotload alias in front of any of the above aliases to enable hotloading of libraries into a running REPL process.

clojure -M:lib/hotload:repl/rebel enables hotloading in the REPL terminal UI.

clojure -M:lib/hotload:env/dev:repl/rebel enables hotloading, included the dev directory (to auto-load user.clj) with a REPL terminal UI.

Remote REPL connection

Connect to the nREPL server of a remote REPL using nREPL connect, using a simple terminal UI

clojure -M:repl/remote --host hostname --port 12345

As above but using the enhanced Rebel Readline UI

clojure -M:repl/rebel-remote --host hostname --port 12345

Alternative REPL

Clojure 1.10.x onward can run a Socket Server for serving a socket-based REPL (Clojure and ClojureScript).

tubular is a Socket Server client for Clojure and Clojurescript REPL processes.

PREPL is a REPL with structured output. See Cloure socket prepl cookbook for examples.

Command Description
clojure -M:repl/socket Clojure REPL using Socket Server on port 50505
clojure -M:repl/socket-zero As above but on first available port (container, cloud environment)
clojure -M:repl/socket-zero -r As above but and run a REPL
clojure -M:repl/socket-node ClojureScript REPL using Socket Server on port 55555
clojure -M:repl/socket-browser ClojureScript REPL using Socket Server on port 58585
clojure -M:repl/socket-client Socket REPL client on port 50505 (tubular)
clojure -M:repl/prepl Clojure REPL using PREPL Server on port 40404
clojure -M:repl/prepl-cljs Clojure REPL using PREPL Server on port 44444

Development Environment

Environment settings and libraries to support REPL driven development

  • :env/dev - add dev directory to class path - e.g. include dev/user.clj to configure REPL starup
  • :lib/nrepl include nrepl as a library
  • :lib/hotload - include org.clojure/tools.deps.alpha add-libs commit to hotload libraries into a running REPL
  • :lib/tools-ns - include org.clojure/tools.namespace to refresh the current namespace in a running REPL
  • :lib/reloaded - combination of hotload and tools-ns aliases
  • :lib/pretty-errors - highlight important aspects of error stack trace using ANSI formatting

Clojure Projects

  • Create projects from deps, leiningen and boot templates with clj-new
  • Check and update project dependencies
  • Package projects as jar and uberjars
  • Deploy projects locally and to Clojars

Create new projects from templates

  • :project/new - create a new project from a template

Create a new project (via clojure.main - classic approach - recommended for Windows to ensure template arguments are parsed correctly)

clojure -M:project/new luminus practicalli/full-stack-app +http-kit +h2 +reagent +auth

Create a new project (Edn command line arguments - recommended approach - except for Windows)

Command Description
clojure -T:project/new library project called playground
clojure -T:project/new :name practicalli/my-library library project with given name
clojure -T:project/new :template app :name practicalli/my-application App project with given name
clojure -T:project/new :template luminus :name practicalli/full-stack-app :args '["+http-kit" "+h2"]' Luminus project with given name and template options
clojure -T:project/new :template figwheel-main :name practicalli/landing-page :args '["--reagent"]' ClojureScript Figwheel-main project with reagent

Running projects

Run project with or without an alias:

clojure -M:alias -m
clojure -M -m

The -M flag is required even if an alias is not included in the running of the application. A warning will be displayed if the -M option is missing.

In the project deps.edn file it could be useful to define an alias to run the project, specifying the main namespace, the function to run and optionally any default arguments that are passed to that function.

{:ns-default domain.main-namespace
 :exec-fn -main
 :exec-args {:port 8888}}

Then the project can be run using clojure -X:project/run and arguments can optionally be included in this command line, to complement or replace any default arguments in exec-args.

Project dependencies

Command Description
clojure -M:project/check detailed report of compilation errors for a project
clojure -M:search/libraries library-name fuzzy search Maven & Clojars
clojure -M:search/libraries -F:merge library-name fuzzy search Maven & Clojars and save to project deps.edn
clojure -T:search/outdated report newer versions for maven and git dependencies
clojure -M:search/outdated-mvn check for newer dependencies (maven only)

Project analysis

Carve - static analysis of code (clj-kondo) and remove or report unused vars

Command Description
clojure -M:project/unused --opts '{:paths ["src" "test"]}' remove unused vars from the src and test paths
clojure -M:project/unused --opts '{:paths ["src" "test"] :report {:format :text}} ' report unused vars from the src and test paths

Generate report in a file:

clojure -M:project/unused --opts '{:paths ["src" "test"] :report {:format :ignore}}' > .carve/ignore

Project packaging

Build a project archive file for deployment

Command Description
clojure -X:project/jar :main-class package project.jar for deps.edn project (publish library)
clojure -X:project/uberjar :main-class package uber.jar for deps.edn project (deploy application)

Additionally specify :jar name and if ahead of time compilation should be used (default true) c

clojure -X:project/jar :jar '""' :aot false :main-class

Project Deployment

Deploy a project archive file locally or to

Command Description
clojure -X:deps mvn-install :jar '"project.jar"' deploy jar file to local maven repository, i.e. ~/.m2/repository
clojure -M:project/clojars project.jar deploy jar file to Clojars
clojure -M:project/clojars-signed project.jar deploy signed jar file to Clojars

Set Clojars username/token in CLOJARS_USERNAME and CLOJARS_PASSWORD environment variables.

Set fully qualified artifact-name and version in project pom.xml file

Path to project.jar can also be set in alias to simplify the Clojure command.

clojure -X:deps mvn-install :jar '"project.jar"' for local deployment of jars is part of the release of the Clojure CLI in September 2020.


Tools to search through code and libraries

  • -M:search/errors clj-check - search each namespace and report compilation warnings and errors
  • -M::search/unused-vars Carve - search code for unused vars and remove them - optionally specifying paths --opts '{:paths ["src" "test"]}'
  • -M:search/libraries - find-deps - fuzzy search Maven & Clojars and add deps to deps.edn
  • -T:search/outdated - liquidz/antq - check for newer versions of libraries, updating deps.edn if :update true passed as argument

Searching library options

A fuzzy search for a library by name, passing multiple names to search for

clojure -M:search/libraries http-kit ring compojure

Add the matching library as a dependency into the project deps.edn file

clojure -M:search/libraries --format:merge http-kit

Format code

  • :lib/pprint-sorted - pretty printing with sorted keys and set values
  • :format/zprint filename - format clojure code and Edn data structures in the given file using zprint
  • :format/cljfmt [check|fix] filename - format clojure code and Edn data structures in the given file(s) using cljfmt

Java Sources

Include Java source on the classpath to look up Java Class and method definitions, eg. cider-find-var in Emacs

Requires: Java sources installed locally (e.g. "/usr/lib/jvm/openjdk-17/lib/")

  • :src/java8
  • :src/java11
  • :src/java17
  • :src/clojure

Use the aliases with either -A, -M or -X execution options on the Clojure command line.

Clone clojure/clojure repository. Clojure core Java source code in src/jvm/clojure/lang/

Databases and drivers

Databases and drivers, typically for development time inclusion such as embedded databases

  • :database/h2 - H2 embedded database library and next.jdbc

clojure -M:database/h2 - run a REPL with an embedded H2 database and next.jdbc libraries

Use the aliases with either -M or -X flags on the Clojure command line.

Data Inspectors

REPL driven data inspectors and tap> sources for visualising data.


Navigate data in the form of edn, json and transit Practicalli Clojure -data browsers section - portal

  • inspect/portal-cli - Clojure CLI (simplest approach)
  • inspect/portal-web - Web ClojureScript REPL
  • inspect/portal-node - node ClojureScript REPL
Command Description
clojure -M:inspect/portal-cli Clojure REPL with Portal dependency
clojure -M:inspect/portal-web ClojureScript web browser REPL with Portal dependency
clojure -M:inspect/portal-node ClojureScript node.js REPL with Portal dependency

Using Portal once running (require '[portal.api :as portal]) once the REPL starts. For inspect/portal-web use (require '[portal.web :as portal]) instead

(portal/open) to open the web based inspector window in a browser.

(portal/tap) to add portal as a tap target (add-tap)

(tap> {:accounts [{:name "jen" :email ""} {:name "sara" :email ""}]}) to send data to the portal inspector window (or any other data you wish to send)

(portal/clear) to clear all values from the portal inspector window.

(portal/close) to close the inspector window.

Reveal data inspector and visualization tool

Reveal - run a Terminal REPL with data visualisation or connect with nREPL, socket or prepl connection and use from any [Clojure aware editor](Clojure aware editors).

Reveal can also used as a tap> source for more powerful manual debugging.

  • :inspect/reveal - simple terminal UI Clojure REPL with Reveal data visualisation UI.
  • :inspect/reveal-light - as above with light theme and 32 point Ubuntu Mono font
  • :inspect/reveal-nrepl - as :inspect/reveal with nREPL server for Clojure aware editors
  • :inspec/reveal-light-nrepl - as above with light theme and 32 point Ubuntu Mono font
  • :inspect/reveal-nrepl-cider - as :inspect-nrepl with Clojure nREPL support for Emacs Cider
  • :inspec/reveal-light-cider - as above with light theme and 32 point Ubuntu Mono font
Command Description
clojure -X:inspect/reveal start a Reveal repl with data visualization window (cloure.main)
clojure -X:inspect/reveal-light as above with light theme and large font
clojure -X:inspect/reveal start a Reveal repl with data visualization window (clojure exec)
clojure -X:inspect/reveal-light as above with light theme and large font
clojure -M:inspect/reveal-nrepl Start nrepl server to use Cider / Calva editors with reveal
clojure -M:inspect/reveal-light-nrepl as above with light theme and large font
clojure -M:inspect/reveal-nrepl Start nrepl server to use Cider / Calva editors with reveal
clojure -M:inspect/reveal-light-nrepl as above with light theme and large font

Cider jack-in and reveal

See the Reveal section of Practicalli Clojure for full details, including how to set up a .dir-locals.el configuration.

:inspect/reveal-cider alias contains Reveal REPL with nrepl server and Emacs CIDER specific middleware

C-u cider-jack-in-clj in CIDER to start a reveal REPL (SPC u , ' in Spacemacs)

Edit the jack-in command by deleting the all the configuration after the clojure command and add the alias

clojure -M:inspect/reveal-cider

:inspect/reveal-cider is a light version of the above.

Running different types of repl

Using Clojure exec -X flag, the default repl function can be over-ridden on the command line, supplying the io-prepl or remote-prepl functions.

  • clojure -X:inspect/reveal io-prepl :title '"I am a prepl repl"
  • clojure -X:inspect/reveal remote-prepl :title '"I am a remote prepl repl"'

Configure theme & font

Add a custom theme and font via the -J command line option or create an alias using :inspect/reveal-light as an example.

clojure -M:inspect/reveal -J-Dvlaaad.reveal.prefs='{:theme :light :font-family "Ubuntu Mono" :font-size 32}'

Rebel Readline & Reveal: Add Reveal as tap> source

Evaluate (add-tap ((requiring-resolve 'vlaaad.reveal/ui))) when using Rebel Readline to add Reveal as a tap source, showing (tap> ,,,) expressions in the reveal window, eg. (tap> (map inc [1 2 3 4 5])).

Practicalli Clojure - data browsers section has more details on using reveal.


Visualise the results of each evaluation in the REPL in the REBL UI. Navigate through complex data structures.

Cognitect REBL aliases requires several separate install steps before they are operational Tested on Oracle JDK 8 and OpenJDK 11 (current long term support). Other Java 11 JDK distributions may work, but not tested. Newer (short term release) may work, but will need the org.openjdk library version in the :inspect/rebl alias changed to match the version of Java used.

  • inspect/rebl - REBL, a visual data explorer (Java 11)
  • inspect/rebl-java8 - REBL, a visual data explorer (Oracle Java 8)
Command Description
clojure -M:inspect/rebl Start REBL REPL and UI (Java 11 only)
clojure -M:inspect/rebl-java8 REBL REPL and UI (Oracle Java 8 only)
clojure -M:lib/cider-nrepl:inspect/rebl:middleware/nrebl REBL REPL and UI with nREPL server (CIDER, Calva) (Java 11 only)


Aliases for libraries that combine community tools and REPL protocols (nREPL, SocketREPL).

Run a REPL on the command line for access by cider-connect- commands, providing the require cider middleware libraries that are auto-injected in cider-jack-in- commands.


  • :middleware/nrepl - Clojure REPL with an nREPL server
  • :middleware/cider-clj - Clojure REPL with nREPL server and CIDER dependencies for cider-connect-clj
  • :middleware/cider-clj-refactor - as :middleware/cider-clj with clj-refactor added
  • :middleware/cider-cljs - ClojureScript REPL with nREPL server and CIDER dependencies for cider-connect-cljs
Command Description
clojure -M:middleware/nrepl Run a Clojure REPL that includes nREPL server
clojure -M:middleware/cider-clj Run a Clojure REPL that includes nREPL server and CIDER connection dependencies
clojure -M:middleware/cider-clj-refactor Run a Clojure REPL that includes nREPL server and CIDER connection dependencies and clj-refactor
clojure -M:middleware/cider-cljs Run a ClojureScript REPL that includes nREPL server and CIDER connection dependencies

Figwheel-main project and cider-connect-cljs

Open a terminal and run the REPL process with the command:

clojure -M:middleware/cider-cljs:fig

An nREPL server process is started along with the figwheel-main process.

In Emacs, run the command cider-connect-cljs, select figwheel-main build tool and the dev build

Cognitect REBL with CIDER

Run the REBL REPL with nREPL server so CIDER can connect.

  • :middleware/nrebl - REBL data browser on nREPL connection
  • :lib/cider-nrepl - include nrepl, cider-nrepl and refactor-nrepl library dependencies (support :inspect/nrebl alias)

In a terminal, run REBL listening to nREPL using the command

clojure -M:lib/cider-nrepl:inspect/rebl:middleware/nrebl

cider-connect-clj in Spacemacs / Emacs and CIDER successfully connects to the nREPL port and evaluated code is sent to REBL.

To start a REBL REPL from cider-jack-in-clj add a .dir-locals.el file to the root of a Clojure project. The .dir-locals.el configuration adds the nREBL aliases set via cider-clojure-cli-global-options and all other automatically injected configuration is disabled (to prevent those dependencies over-riding the nREBL aliases).

((clojure-mode . ((cider-preferred-build-tool . clojure-cli)
                  (cider-clojure-cli-global-options . "-M:lib/cider-nrepl:inspect/rebl:middleware/nrebl")
                  (cider-jack-in-dependencies . nil)
                  (cider-jack-in-lein-plugins . nil)
                  (cider-clojure-cli-parameters . ""))))

Debug Tools

Emacs CIDER has a built in debug tool that requires no dependencies (other than Cider itself).

Sayid is a comprehensive debug and profile tool (which requires your code to compile) and generated a full and detailed history of an evaluation.

  • lib/sayid - an omniscient debugger and profiler for Clojure

The :lib/sayid alias can be used with :repl/cider when using cider-connect-clj or added to the cider-jack-in-clj command manually, or via a .dir-locals.el configuration using cider-clojure-cli-aliases. See the Practicalli Spacemacs project configuration guide for examples.

Clojure Specification

Clojure spec, generators and test.check

  • :lib/spec-test - generative testing with Clojure test.check
  • :lib/spec2 - experiment with the next version of Clojure spec - alpha: design may change

Unit Testing frameworks

Unit test libraries and configuration. The Clojure standard library includes the clojure.test namespace, so no alias is required.

Include expectations as a development dependency in a project clojure -M:env/test:lib/expectations, or on the command line with the cognitect test runner clojure -M:lib/expectations:test/cognitect

Test runners and Test Coverage tools

Run unit tests in a project which are defined under the test path. See Practicalli Clojure: Unit testing

Command Description
clojure -X:test/run run tests with the Kaocha comprehensive test runner for Clojure (same as :test/kaocha)
clojure -X:test/watch run tests in watch mode using Kaocha test runner for Clojure (same as :test/kaocha-watch)
clojure -X:test/cognitect Cognitect Clojure test runner
clojure -X:test/coverage Cloverage clojure.test coverage report
clojure -M:test/cljs ClojureScript test runner (Olical)
clojure -X:test/kaocha Kaocha - test runner for Clojure (same as :test/run)
clojure -M:test/kaocha-cljs Kaocha - test runner for ClojureScript
clojure -M:test/kaocha-cucumber Kaocha - test runner with BDD Cucumber tests
clojure -M:test/kaocha-junit-xml Kaocha - test runner with Junit XML reporting for CI dashboards & wallboards
clojure -M:test/kaocha-cloverage Kaocha - test runner with test coverage reporting

:lib/kaocha alias adds kaocha as a library to the class path, enabling scripts such as kaocha-runner.el to run Kaocha test runner from Emacs Cider

A test.edn configuration file can be used with the :test/run alias instead of using various aliases defined above Kaocha aliases can be run with -T execution option if both the src and test paths are included, either in the combined deps.edn config or in the tests.edn config.

kaocha recommends adding a bin/kaocha shell script to run the tool, which can be written using the Practicalli aliases, for example:

#!/usr/bin/env sh
clojure -X:test/run "$@"

Lint tools

Static analysis tools to help maintain code quality and suggest Clojure idioms.

Command Description
clojure -M:lint/clj-kondo comprehensive and fast static analysis lint tool
clojure -M:lint/eastwood classic lint tool for Clojure
clojure -M:lint/idiom Suggest idiomatic Clojure code

Visualising project vars and library dependencies

Create Graphviz graphs of project and library dependencies

Install Graphviz to generate PNG and SVG images. Or use the Edotor website to convert .dot files to PNG or SVG images and select different graph layout engines.

Var dependencies

Generate dependency graphs for Vars in Clojure & ClojureScript namespaces

  • :graph/vars - generate graph of vars in a project as a .dot file
  • :graph/vars-png - generate graph of vars in a project as a .png file using src and test paths
  • :graph/vars-svg - generate graph of vars in a project as a .svg file using src and test paths

Use -f command line argument to over-ride file type created, i.e -f png

Namespace dependencies

Vizns creates graphs of relationships between namespaces and their dependencies

  • clojure -M:graph/ns-deps - generate a single deps-graph SVG image
  • clojure -M:graph/ns-deps-png as above with PNG image

Other options described in the visns project readme:

Project Dependency Relationships

Visualise the relationships between dependencies in the project (or given deps.edn configuration). Shows the fully qualified name of a dependency, its version and size.

Generate a PNG image from the project deps.edn configuration and save to project-dependencies-graph.png file

clojure -T:graph/deps

Options available

  • :deps - Path to deps file (default = "deps.edn")
  • :trace - images showing individual trace images of dependency relations (default = false)
  • :trace-file - Path to trace.edn file to read
  • :output - file name string to save the generated image, :output '"deps.png"'
  • :trace-omit - Collection of lib symbols to omit in trace output
  • :size - Boolean flag to include sizes in images (default = false)

Performance testing

Performance testing tools for the REPL

Use the aliases with either -M or -X flags on the Clojure command line.

clojure -M:performance/benchmark:repl/rebel

(require '[criterium.core :refer [bench quick-bench]])
(bench (expression-to-test))

Performance test a project in the REPL

clojure -M:performance/benchmark:repl/rebel

(require '[practicalli/namespace-name]) ; require project code
(in-ns 'practicalli/namespace-name)
(quick-bench (project-function args))

Use the aliases with either -M or -X flags on the Clojure command line.

In the REPL:

  (require '[clj-memory-meter.core :as memory-meter])
   (memory-meter/measure (your-expression))


Web servers and other standalone services run with Clojure CLI

  • :service/http - serve files from current directory or specified directory and port. More options at kachayev/nasus project.
Command Description
clojure -M:service/http HTTP file server for current directory on port 8000
clojure -M:service/http 8888 as above with PORT specified to 8888
clojure -M:service/http 8888 --dir docs as above with PORT 8888 and doc directory

Use Ctrl-c to stop the server when running in the foreground


DEPRECATED: :security/nvd Using clojure-nvd via an alias checks for security issues in clojure-nvd and its dependencies as they merged into the classpath.

The maintainer of clojure-nvd suggested several ways to avoid classpath interference

Command Description
clojure -T:security/nvd "" "$(clojure -Spath)" check all jar files on the class path for security vulnerabilities

The first "" is required argument and can contain a filename to a json file of additional configuration. The second argument, "$(clojure -Spath)", passes the project classpath to be analysed as a string.

Community activities

The Clojurians Zulip CLI provides a simple way to register community events.

  • :community/zulip-event create an event on the Clojurians Zulip community

Set an environment variable called ZULIP_AUTH to your account email, followed by the account token (in settings), e.g.

Create an event using the following command

clojure -M:community/zulip-event create --zulip-auth "${ZULIP_AUTH}" --title 'Practicalli Live - challenges' --start '2020-11-14T09:00+00:00' --duration 1 --url --description 'Walking through solutions to the challenges'

Take care to get the timezone notation correct.

Library Hosting Services

Repositories that host libraries for Clojure.

central and clojars are the man repositories for Clojure development are consulted in order.

central and clojars repos can be removed from consideration by setting their configuration hash-map to nil in ~/.clojure/deps.edn. For example, {:mvn/repos {"central" nil}}.

The order of additional repositories consulted is not guaranteed, so may cause unpredictable side effects in the project build especially if RELEASE or LATEST tags are used rather than a numeric library version.

Maven supports explicit mirror definition in ~/.m2/settings.xml and Clojure CLI supports this configuration. Adding Maven Central or a mirror to ~/.m2/settings.xml negates the need for its entry in deps.edn configuration.

Recommended repositories

  • central - Maven Central, the canonical repository for JVM libraries, including Clojure releases
  • clojars -, the canonical repositories for Clojure community libraries fronted by a contend delivery network service

Optional repositories

Use only one entry for a specific repository to ensure a repeatable build. For example, avoid having Maven Central and a Maven Central mirror both included.

Business area

Example of local Artifactory repository configuration

 {"business-area" {:url ""}

Americas mirrors

 {"google-maven-central" {:url ""}}

Europe mirrors

 {"google-maven-central" {:url ""}

 ;; CDN access to clojars
 "clojars" {:url ""}}

Asian Region Mirrors

 {"google-maven-central" {:url ""}

 ;; Community mirror
 "clojars-china-mirror" {:url ""}

 ;; CDN access to clojars
 "clojars" {:url ""}}

Maven local repository

Define a local Maven repository. Useful if you wish to specify an alternative to the default ~/.m2/ directory.

 :mvn/local-repo "/cache/.m2"

NOTE: using clojure -Sforce forces a classpath recompute, deleting the contents of .cpcache


User level aliases and Clojure CLI configuration for deps.edn based projects






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