Using the Node SDK

1. Install the SmoothSail Node SDK in your project by running npm i smoothsail-node-sdk .
2. Import the SmoothSailConfig file into whichever files you will be evaluating flags in.

import { SmoothSailConfig } from "smoothsail-node-sdk";

3. Set up an environment variable for the SECRET_KEY. This should be the same secret used for SmoothSail's Manager.

4. Use the SmoothSailConfig class constructor to instantiate a config object. The constructor takes two arguments:

• (string) SDK Key, from SmoothSail's dashboard UI
• (string) Address of SmoothSail's SDK Service

// shown as hard-coded but recommend having these as environment variables

const config = new SmoothSailConfig("SDK key", "SDK Service address");

5. Instantiate a SmoothSailClient by calling config.connect(). Note that this is an asynchronous action so you will need to use async/await to perform this step.

const config = new SmoothSailConfig("SDK key", "bearer address");

let client;

// instantiate SmoothSailClient

(async () => {
  client = await config.connect();
})();

6. Use the SmoothSailClient.prototype.evaluateFlag() method to evaluate flags. SmoothSailClient.prototype.evaluateFlag() takes 3 arguments:

• (string) Flag Key, fKey from SmoothSail's dashboard UI
• (object) User Context object
• (boolean) Default value for flag evaluation, optional argument

let testUserContext = {
  user_name: "John Smith",
  "beta-tester": true,
};

router.get("/", async (req, res) => {
  if (client.evaluateFlag("flag-1", testUserContext, true)) {
    // execute process for beta tester
  } else {
    // execute stable process
  }
})