Development Conductor

The easiest Conductor to run is built right into the development command line tools. It has no required configuration and is launched via the hc run command. Meant primarily for accelerating the development process it is useful for testing APIs or prototyping user interfaces. The hc run command expects to be executed from inside a directory with valid DNA source files: The command is simply:

hc run

This will start the DNA instance in a Conductor and open, by default, a WebSocket JSON-RPC server on port 8888. You can find more details on how to use the API in your UI in the JSON-RPC interfaces article.

The following are the options for configuring hc run, should you need something besides the defaults.



Package your DNA before running it. Recall that to package is to build the bundle.json file from the source files. hc run always looks for a bundle.json file in the root of your DNA folder, so make sure that one exists there when trying to use it. hc run --package will do this, or run hc package beforehand.


hc run --package



Persist source chain and DHT data onto the file system. By default, none of the data being written to the source chain gets persisted beyond the running of the server. This will store data in the same directory as your DNA source code, in a hidden folder called .hc.


hc run --persist



Select a particular JSON-RPC interface to serve your DNA instance over.

The JSON-RPC interface will expose, via a port on your device, a WebSocket or an HTTP server. It can be used to make function calls to the Zomes of a DNA instance. These are covered in depth in the JSON-RPC interfaces article.

The default interface is websocket.

examples To run it as HTTP, run:

hc run --interface http

To explicitly run it as WebSockets, run:

hc run --interface websocket



Customize the port number that the server runs on.


hc run --port 3400



Select whether the Conductor should network with other nodes that are running instances of the same DNA. By default this does not occur, instead the instance runs in isolation from the network, allowing only the developer to locally access it.

This option requires more configuration, which can be read about in the configuring networking article.

Stopping the Server

Once you are done with the server, to quit type exit then press Enter, or press Ctrl-C.

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