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

const client = new sdk.Client()
    .setEndpoint('https://cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('5df5acd0d48c2') // Your project ID
    .setKey('919c2d18fb5d4...a2ae413da83346ad2'); // Your secret API key

const functions = new sdk.Functions(client);

const result = await functions.createVariable(
    '<FUNCTION_ID>', // functionId
    '<KEY>', // key
    '<VALUE>' // value
);