diff --git a/docs/grpc/javascript.md b/docs/grpc/javascript.md new file mode 100644 index 00000000..a6af9219 --- /dev/null +++ b/docs/grpc/javascript.md @@ -0,0 +1,62 @@ +# How to write a simple lnd client in Javascript using nodejs? + +First, you need to initialize a simple nodejs project: + +``` +npm init (or npm init -f if you want to use the default values without prompt) +``` + +Then you need to install the Javascript grpc library dependency: + +``` +npm install grpc --save +``` + +You also need to copy the `lnd` `rpc.proto` file in your project directory (or at least somewhere reachable by your Javascript code). + +The `rpc.proto` file is located in the `lnrpc` directory of the `lnd` sources. + +I had to comment the following line in the `rpc.proto` file otherwise `grpc` would crash: + +``` +//import "google/api/annotations.proto"; +``` + +Let's now write some Javascript code that simply displays the getinfo command result on the console: + +``` +var grpc = require('grpc'); + +var lnrpcDescriptor = grpc.load("rpc.proto"); + +var lnrpc = lnrpcDescriptor.lnrpc; + +var lightning = new lnrpc.Lightning('localhost:10009', grpc.credentials.createInsecure()); + +lightning.getInfo({}, function(err, response) { + console.log('GetInfo:', response); +}); + +``` + +You just have to lauch your newly created Javascript file `getinfo.js` using `nodejs`: + +``` +node getinfo.js +``` + +You should get something like this in your console: + +``` +GetInfo: { identity_pubkey: '03c892e3f3f077ea1e381c081abb36491a2502bc43ed37ffb82e264224f325ff27', + alias: '', + num_pending_channels: 0, + num_active_channels: 0, + num_peers: 0, + block_height: 1087612, + block_hash: '000000000000024b2acc37958b15010057c6abc0a48f83c8dd67034bee2cb823', + synced_to_chain: true, + testnet: true } +``` + +Enjoy! \ No newline at end of file