Crux nodes can be embedded within your JVM application, or they can be started standalone through a pre-built Crux JAR, via Docker, or using Clojure CLI tooling.

This guide will show you how to set up an in-memory node using the crux-core module. You can then proceed to add further modules (eg for persistence) as required - see the documentation of the individual modules for more information.

Project dependency

Crux depends on Java 8+.

  • deps.edn

  • pom.xml

pro.juxt.crux/crux-core {:mvn/version "1.18.1"}

Within your JVM application

First, add the crux-core module as a project dependency. We can then start up an in-memory Crux node with:

  • Clojure

  • Java

  • Kotlin

(require '[crux.api :as crux])

(crux/start-node {})
import crux.api.Crux;
import crux.api.ICruxAPI;

public static void main(String[] args) {
    try(ICruxAPI cruxNode = Crux.startNode()) {
        // ...
    catch (IOException e) {
        // ...
import crux.api.Crux

fun main() {
    Crux.startNode().use {
        // ...

Using a pre-built Crux JAR

You can start a standalone Crux node, accessible through HTTP, using a pre-built Crux JAR. Crux pre-built JARs can be found on the relevant GitHub releases page - we’ll use crux-in-memory.jar.

Start it in the usual way, with java -jar crux-in-memory.jar. This will open an HTTP port with a console UI on port 3000 - open http://localhost:3000 in your favourite browser.

You can also build custom Crux JARs with your choice of modules - see the Crux build blog for more details.

Via Docker

You can also start a standalone Crux node using Docker, using:

docker run -p 3000:3000 juxt/crux-in-memory:1.18.1

Again, this opens up an HTTP server at http://localhost:3000.

Likewise, you can build custom Crux Docker images - see the Crux build blog for more details.

Clojure CLI tooling

Similarly, to start Crux using Clojure’s CLI tooling:

  • deps.edn

{:deps {org.clojure/clojure {:mvn/version "1.10.3"}

        pro.juxt.crux/crux-core {:mvn/version "1.18.1"}
        pro.juxt.crux/crux-http-server {:mvn/version "1.18.1"}}}
  • crux.edn

{:crux.http-server/server {:port 3000}}

Then, start the node with clojure -m crux.main.

You can get a listing of CLI flags using clojure -m crux.main -h.