How to Configure App Settings in Azure App Service

To configure app settings in Azure, go to your Azure App Service in the portal, select Configuration, then add or edit key-value pairs under Application settings. These settings act like environment variables and are used by your app at runtime.

Syntax

App settings in Azure App Service are key-value pairs that you define under the Application settings section. Each setting has a name and a value. These are injected as environment variables into your app.

Example syntax for a setting:

• Key: The name of the setting, e.g., MySetting
• Value: The value for the setting, e.g., 12345

text

MySetting=12345

Example

This example shows how to add an app setting named ConnectionString with a value for your database connection. Your app can then read this setting as an environment variable.

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1. Open Azure Portal and go to your App Service.
2. Select <strong>Configuration</strong> from the left menu.
3. Under <strong>Application settings</strong>, click <strong>New application setting</strong>.
4. Enter <code>ConnectionString</code> as the name and your connection string as the value.
5. Click <strong>OK</strong> and then <strong>Save</strong> to apply changes.

// In your app code (example in C#):
string connStr = Environment.GetEnvironmentVariable("ConnectionString");

Output

The app setting is saved and available as an environment variable named 'ConnectionString' when the app runs.

Common Pitfalls

Common mistakes when configuring app settings include:

• Not saving changes after adding or editing settings, so the app does not see updates.
• Using incorrect key names or typos, causing the app to fail reading the setting.
• Storing sensitive data in plain text without using Azure Key Vault integration.
• Expecting changes to apply instantly without restarting the app; sometimes a restart is needed.

csharp

Wrong way:
// Typo in key name
string connStr = Environment.GetEnvironmentVariable("ConnetionString"); // typo

Right way:
string connStr = Environment.GetEnvironmentVariable("ConnectionString");

Quick Reference

Action	Description
Add App Setting	Go to App Service > Configuration > Application settings > New application setting
Edit App Setting	Select existing setting, change value, then save
Delete App Setting	Select setting, click delete, then save
Access in Code	Use environment variables with the setting name
Secure Secrets	Use Azure Key Vault references for sensitive data

Key Takeaways

Configure app settings in Azure App Service under Configuration > Application settings.

App settings become environment variables your app can read at runtime.

Always save changes and restart your app if needed to apply new settings.

Avoid typos in key names to prevent runtime errors.

Use Azure Key Vault for storing sensitive information securely.