Azure App Configuration SDK for TypeScript

Centralized configuration management with feature flags and dynamic refresh.

Installation

# Low-level CRUD SDK
npm install @azure/app-configuration @azure/identity

# High-level provider (recommended for apps)
npm install @azure/app-configuration-provider @azure/identity

# Feature flag management
npm install @microsoft/feature-management

Environment Variables

AZURE_APPCONFIG_ENDPOINT=https://<your-resource>.azconfig.io
# OR
AZURE_APPCONFIG_CONNECTION_STRING=Endpoint=https://...;Id=...;Secret=...

Authentication

import { AppConfigurationClient } from "@azure/app-configuration";
import { DefaultAzureCredential } from "@azure/identity";

// DefaultAzureCredential (recommended)
const client = new AppConfigurationClient(
  process.env.AZURE_APPCONFIG_ENDPOINT!,
  new DefaultAzureCredential()
);

// Connection string
const client2 = new AppConfigurationClient(
  process.env.AZURE_APPCONFIG_CONNECTION_STRING!
);

CRUD Operations

Create/Update Settings

// Add new (fails if exists)
await client.addConfigurationSetting({
  key: "app:settings:message",
  value: "Hello World",
  label: "production",
  contentType: "text/plain",
  tags: { environment: "prod" },
});

// Set (create or update)
await client.setConfigurationSetting({
  key: "app:settings:message",
  value: "Updated value",
  label: "production",
});

// Update with optimistic concurrency
const existing = await client.getConfigurationSetting({ key: "myKey" });
existing.value = "new value";
await client.setConfigurationSetting(existing, { onlyIfUnchanged: true });

Read Settings

// Get single setting
const setting = await client.getConfigurationSetting({
  key: "app:settings:message",
  label: "production",  // optional
});
console.log(setting.value);

// List with filters
const settings = client.listConfigurationSettings({
  keyFilter: "app:*",
  labelFilter: "production",
});

for await (const setting of settings) {
  console.log(`${setting.key}: ${setting.value}`);
}

Delete Settings

await client.deleteConfigurationSetting({
  key: "app:settings:message",
  label: "production",
});

Lock/Unlock (Read-Only)

// Lock
await client.setReadOnly({ key: "myKey", label: "prod" }, true);

// Unlock
await client.setReadOnly({ key: "myKey", label: "prod" }, false);

App Configuration Provider

Load Configuration

import { load } from "@azure/app-configuration-provider";
import { DefaultAzureCredential } from "@azure/identity";

const appConfig = await load(
  process.env.AZURE_APPCONFIG_ENDPOINT!,
  new DefaultAzureCredential(),
  {
    selectors: [
      { keyFilter: "app:*", labelFilter: "production" },
    ],
    trimKeyPrefixes: ["app:"],
  }
);

// Map-style access
const value = appConfig.get("settings:message");

// Object-style access
const config = appConfig.constructConfigurationObject({ separator: ":" });
console.log(config.settings.message);

Dynamic Refresh

const appConfig = await load(endpoint, credential, {
  selectors: [{ keyFilter: "app:*" }],
  refreshOptions: {
    enabled: true,
    refreshIntervalInMs: 30_000,  // 30 seconds
  },
});

// Trigger refresh (non-blocking)
appConfig.refresh();

// Listen for refresh events
const disposer = appConfig.onRefresh(() => {
  console.log("Configuration refreshed!");
});

// Express middleware pattern
app.use((req, res, next) => {
  appConfig.refresh();
  next();
});

Key Vault References

const appConfig = await load(endpoint, credential, {
  selectors: [{ keyFilter: "app:*" }],
  keyVaultOptions: {
    credential: new DefaultAzureCredential(),
    secretRefreshIntervalInMs: 7200_000,  // 2 hours
  },
});

// Secrets are automatically resolved
const dbPassword = appConfig.get("database:password");

Feature Flags

Create Feature Flag (Low-Level)

import {
  featureFlagPrefix,
  featureFlagContentType,
  FeatureFlagValue,
  ConfigurationSetting,
} from "@azure/app-configuration";

const flag: ConfigurationSetting<FeatureFlagValue> = {
  key: `${featureFlagPrefix}Beta`,
  contentType: featureFlagContentType,
  value: {
    id: "Beta",
    enabled: true,
    description: "Beta feature",
    conditions: {
      clientFilters: [
        {
          name: "Microsoft.Targeting",
          parameters: {
            Audience: {

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