Looking for a simpler, faster way to invoke AWS Lambda functions—without the complexity of API Gateway? AWS Lambda URLs, also known as Lambda function URLs, might just be your best-kept secret.

In this guide, you’ll learn how Lambda URLs work, when to use them, and why they’re a smart shortcut for building nimble serverless apps.

✅ Quick Answer

A Lambda function URL is a built-in HTTPS endpoint that lets you trigger an AWS Lambda function directly—no API Gateway required. It’s ideal for fast prototyping, long-running tasks, or lightweight public endpoints.

Watch this explanation in under 5 minutes:

Table of Contents

• Why API Gateway Can Be Overkill
• What Exactly Is a Lambda Function URL?
• Top Benefits of Using Lambda URLs
• Limitations to Be Aware Of
• Best Use Cases for Lambda URLs
• Lambda Function URL vs API Gateway
• Related Questions
• Further Reading
• TL;DR Summary

Why API Gateway Can Be Overkill

Do you really need a full-blown API Gateway setup for every Lambda function? Not always.

While API Gateway is powerful, it’s also complex. You’ll need to configure resources, methods, and often use frameworks like Serverless Framework or AWS SAM. And even then, you’re limited to 1-minute timeouts—while Lambda itself supports up to 15 minutes.

What Exactly Is a Lambda Function URL?

An AWS Lambda function URL is a native HTTPS endpoint tied directly to your Lambda function. Once enabled, it lets you invoke your function from anywhere—no API Gateway, no proxy setup.

It’s as straightforward as hitting a URL and executing serverless logic.

Top Benefits of Using Lambda URLs

Here’s why developers are increasingly choosing Lambda function URLs:

• No API Gateway required – drastically simplifies architecture
• Supports long-running tasks – up to 15 minutes
• Ideal for webhooks & lightweight endpoints
• Great for MVPs, internal dashboards, or proof-of-concept tools

Learn more about how to build your MVP on AWS

Limitations to Be Aware Of

Lambda URLs are intentionally lean—so you trade flexibility for simplicity. Here’s what you don’t get out of the box:

• No native authentication (IAM signatures can help)
• No request mapping, rate limiting, or caching
• No custom domains unless manually configured

If your project needs advanced features, you can understand API Gateway in depth to evaluate the right fit.

Best Use Cases for Lambda URLs

Lambda URLs shine in scenarios where speed and simplicity matter most:

• Receiving public webhooks from third-party tools
• Launching a background job or scheduled task
• Building a quick proof of concept or MVP
• Serving internal tools where security is handled upstream

Lambda Function URL vs API Gateway

What’s the difference between a Lambda function URL and API Gateway?

Feature Comparison Table

Feature	Lambda Function URL	API Gateway
Setup Complexity	Minimal	Moderate to High
Authentication	Basic (IAM)	Advanced (Cognito, OAuth, etc.)
Request/Response Mapping	None	Full Support
Timeout	15 minutes	1 minute (default)
Best For	Webhooks, MVPs, internal tools	Full-featured APIs

Related Questions

How do Lambda function URLs differ from API Gateway endpoints?

Lambda function URLs are direct-to-function triggers that bypass API Gateway’s complex setup—making them faster to implement but more limited in features.

Can you secure a Lambda function URL?

Yes, with IAM-based signature authentication, though there’s no built-in token or OAuth support like API Gateway offers.

Is performance impacted when using Lambda function URLs?

They are efficient for small to medium workloads, but lack built-in caching or throttling options.

Further Reading

Want a deeper breakdown of Lambda function URL vs API Gateway?
Read about API Gateway on our blog

TL;DR Summary

• Lambda function URLs are direct HTTPS endpoints to invoke Lambda.
• Perfect for MVPs, internal tools, and public webhooks.
• Skip API Gateway setup for simpler, faster development.
• Not ideal for complex apps requiring advanced auth or routing.