appwrite/app/sdks/server-nodejs/docs/examples/storage/create-file.md

const sdk = require('node-appwrite');
const fs = require('fs');

// Init SDK
let client = new sdk.Client();

let storage = new sdk.Storage(client);

client
    .setEndpoint('https://[HOSTNAME_OR_IP]/v1') // Your API Endpoint
    .setProject('5df5acd0d48c2') // Your project ID
    .setKey('919c2d18fb5d4...a2ae413da83346ad2') // Your secret API key
;

let promise = storage.createFile(fs.createReadStream(__dirname + '/file.png')), [], []);

promise.then(function (response) {
    console.log(response);
}, function (error) {
    console.log(error);
});