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add server example
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‎examples/express-app/config.json

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{
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"feature_management": {
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"feature_flags": [
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{
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"id": "Beta",
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"enabled": true,
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"conditions": {
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"client_filters": [
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{
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"name": "Microsoft.Targeting",
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"parameters": {
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"Audience": {
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"Users": [
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"Jeff"
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],
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"Groups": [
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{
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"Name": "Admin",
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"RolloutPercentage": 100
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}
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],
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"DefaultRolloutPercentage": 40
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}
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}
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}
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]
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}
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}
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]
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}
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}

‎examples/express-app/package.json

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{
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"dependencies": {
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"@azure/app-configuration-provider": "latest",
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"@microsoft/feature-management": "latest",
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"express": "^4.21.2"
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}
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}

‎examples/express-app/pages/beta.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Beta</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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text-align: center;
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background-color: #ffffff;
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color: #000000;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 75vh;
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}
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h1 {
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font-size: 5em;
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margin: 0;
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}
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</style>
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</head>
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<body>
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<div>
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<h1>Welcome to the Beta page!</h1>
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</div>
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</body>
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</html>

‎examples/express-app/pages/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Home</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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text-align: center;
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background-color: #ffffff;
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color: #000000;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 75vh;
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}
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h1 {
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font-size: 5em;
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margin: 0;
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}
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</style>
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</head>
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<body>
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<div>
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<h1>Hello World!</h1>
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</div>
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</body>
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</html>

‎examples/express-app/server.mjs

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import express from "express";
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import path from "path";
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import { fileURLToPath } from "url";
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import fs from 'node:fs/promises';
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import { load } from "@azure/app-configuration-provider";
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const connectionString = "<your-connection-string>";;
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const appConfig = await load(connectionString, {
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featureFlagOptions: {
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enabled: true,
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selectors: [{
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keyFilter: "*"
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}],
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refresh: {
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enabled: true
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}
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}
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});
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appConfig.onRefresh(() => {
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console.log("Configuration has been refreshed.");
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});
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import { ConfigurationObjectFeatureFlagProvider, ConfigurationMapFeatureFlagProvider, FeatureManager } from "@microsoft/feature-management";
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/*
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You can use either ConfigurationObjectFeatureFlagProvider or ConfigurationMapFeatureFlagProvider to provide feature flags.
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We recommend using Azure App Configuration as the source of feature flags.
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*/
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// const config = JSON.parse(await fs.readFile("config.json"));
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// const featureProvider = new ConfigurationObjectFeatureFlagProvider(config);
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const featureProvider = new ConfigurationMapFeatureFlagProvider(appConfig);
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const featureManager = new FeatureManager(featureProvider);
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const app = express();
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const PORT = 3000;
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const __filename = fileURLToPath(import.meta.url);
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const __dirname = path.dirname(__filename);
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const pageDir = path.join(__dirname, "pages");
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app.get("/", (req, res) => {
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appConfig.refresh();
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res.sendFile(path.join(pageDir, "index.html"));
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});
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app.get("/Beta", async (req, res) => {
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appConfig.refresh();
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const { userId, groups } = req.query;
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if (await featureManager.isEnabled("Beta", { userId: userId, groups: groups ? groups.split(",") : [] })) {
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res.sendFile(path.join(pageDir, "beta.html"));
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} else {
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res.status(404).send("Page not found");
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}
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});
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// Start the server
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app.listen(PORT, () => {
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console.log(`Server is running at http://localhost:${PORT}`);
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});

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