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clj — Clojure tool to start a REPL or invoke a function with data. All options can be defined in a `deps.e

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the clj command: Clojure tool to start a REPL or invoke a function with data. All options can be defined in a deps.edn file. More information: <https://clojure.org/guides/deps_and_cli>.

Solution

clj — Clojure tool to start a REPL or invoke a function with data. All options can be defined in a deps.edn file. More information: <https://clojure.org/guides/deps_and_cli>.

Start a REPL (interactive shell):

clj

Execute a function:

clj -X {{namespace/function_name}}

Run the main function of a specified namespace:

clj -M {{[-m|--main]}} {{namespace}} {{args}}

Prepare a project by resolving dependencies, downloading libraries, and making/caching classpaths:

clj -P

Start an nREPL server with the CIDER middleware:

clj -Sdeps '{:deps {nrepl {:mvn/version "0.7.0"} cider/cider-nrepl {:mvn/version "0.25.2"}}}' {{[-m|--main]}} nrepl.cmdline --middleware '["cider.nrepl/cider-middleware"]' --interactive

Start a REPL for ClojureScript and open a web browser:

clj -Sdeps '{:deps {org.clojure/clojurescript {:mvn/version "1.10.758"}}}' {{[-m|--main]}} cljs.main {{[-r|--repl]}}

Code Snippets

Start a REPL (interactive shell)

clj

Execute a function

clj -X {{namespace/function_name}}

Run the main function of a specified namespace

clj -M {{[-m|--main]}} {{namespace}} {{args}}

Prepare a project by resolving dependencies, downloading libraries, and making/caching classpaths

clj -P

Start an nREPL server with the CIDER middleware

clj -Sdeps '{:deps {nrepl {:mvn/version "0.7.0"} cider/cider-nrepl {:mvn/version "0.25.2"}}}' {{[-m|--main]}} nrepl.cmdline --middleware '["cider.nrepl/cider-middleware"]' --interactive

Context

tldr-pages: common/clj

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