Receive a LNPlay QR code? If so, we show you how to use that info for front-end web app development using Core Lighting's REST interface.

Extract the Node and Rune Information

The first step is to extract the rune and node information from the QR code by using a URL Decoder.

Scan the LNPlay QR code using a suitable scanner app or device and copy the URL. Next, paste the URL into a URL decoder app. Now examine the decoded text. Identify the following elements.

Verify access to your Core Lightning Node

Now that we have the REST endpoint and RUNE, we can start making REST calls. Try the following curl command. Be sure to swap out your Rune and service endpoint!

curl --silent -X POST https://lnplay.rocketcitybitcoin.org:9001/v1/getinfo -H 'accept: application/json' -H 'Rune: MvYiCZ5LkkgCA_W_VyVpV7il5SXNASIi72RjNYffJpE9MA==' -H 'Content-Type: application/json' -d '{}'

Resources

There are a lot of useful tools for interacting with a CLN REST interface including:

• CLN Docs on the REST interface. This includes REST/websocket client examples.
• Call an RPC method on a node - CLN REST documentation
• Getting started with the CLN REST plugin on lnroom.live.