How-to guides for Dev Proxy

Find guides organized by what you want to accomplish.

Test API resilience

Simulate failures and edge cases to see how your app behaves.

• Test my app with random errors · 5 min
• Simulate slow API responses · 5 min
• Test that my application handles throttling properly · 5 min
• Simulate Rate-Limit API responses · 10 min
• Change request failure rate · 2 min

Microsoft Graph specific

• Simulate errors from Microsoft Graph APIs · 5 min
• Simulate throttling on Microsoft 365 APIs · 10 min

Language models (OpenAI, Azure OpenAI)

• Test my app with language model failures · 5 min
• Simulate errors from OpenAI APIs · 5 min
• Test language model token limits · 10 min

Mock APIs

Create mock responses without building a real API.

• Mock responses · 10 min
• Mock n-th request · 5 min
• Mock multiple responses to the same endpoint · 10 min
• Mock responses that return binary data · 10 min
• Change mocks file · 2 min

Dynamic CRUD APIs

• Simulate a CRUD API · 15 min
• Simulate a CRUD API across the internet · 20 min
• Simulate a CRUD API secured with Microsoft Entra · 25 min
• Simulate mock responses across the internet · 15 min

Language model APIs

• Simulate OpenAI API · 15 min
• Simulate Azure OpenAI API · 15 min

Analyze API usage

Understand what APIs your app calls and how.

• Discover URLs to watch · 5 min
• Record and export proxy activity · 10 min
• Generate an HTTP file · 5 min
• Generate an OpenAPI spec · 10 min
• Generate a TypeSpec file · 10 min
• Understand language model usage · 10 min

Check permissions and best practices

Get guidance on using APIs correctly.

Microsoft Graph

• Detect minimal Microsoft Graph API permissions · 10 min
• Check if you're using excessive Microsoft Graph API permissions · 10 min
• Update my application code to use Microsoft Graph JavaScript SDK · 15 min

General APIs

• Check if my app is using production-level APIs · 5 min
• Check if my app is calling APIs with minimal permissions · 10 min
• Find shadow APIs · 10 min

Intercept requests

Control which requests Dev Proxy intercepts.

• Intercept requests from specific processes · 5 min
• Intercept requests with specific headers · 5 min
• Intercept requests to localhost · 5 min
• Exclude a URL · 2 min
• Inspect requests and responses using Chrome DevTool · 10 min
• Inspect API requests issued by cloud services · 15 min

Use Dev Proxy with your stack

Platform and framework-specific guides.

• With Node.js applications · 10 min
• With Node.js applications in Docker containers · 15 min
• With JavaScript Azure Functions · 15 min
• With .NET applications · 10 min
• With .NET applications in Docker containers · 15 min
• With .NET Azure Functions · 15 min
• With .NET Aspire applications · 15 min
• With SharePoint Framework (SPFx) solutions · 10 min
• In a Docker container · 15 min

Automate in CI/CD

Run Dev Proxy in automated pipelines.

• In CI/CD scenarios · 20 min

Customize Dev Proxy

Change settings and extend functionality.

• Use preset configurations · 5 min
• Change logging level · 2 min
• Clear the output · 1 min
• Use local language model with Dev Proxy · 15 min
• Refresh local Microsoft Graph database · 5 min

Common problems

Solutions to frequently encountered issues.

• No requests are intercepted
• No random errors are thrown when using mocks
• No internet connection after using the proxy
• All requests fail with 429 responses
• All requests fail with gateway time-out
• Binary responses aren't mocked
• No requests are intercepted from my .NET 4.8 app
• Options aren't recognized
• The type initializer for 'Microsoft.Data.Sqlite.SqliteConnection' threw an exception
• Uninstall

Get help

• Get help and support