# Testing and debugging {% hint style="info" %} This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-sam-developer-guide.git) {% endhint %} ## Invoking functions locally * **Note**\ The sam local invoke command corresponds to the AWS Command Line Interface (AWS CLI) command . You can use either command to invoke a Lambda function. ## Running API Gateway locally * **Note**\ \&#xNAN;*Hot reloading* is when only the files that changed are refreshed, and the state of the application remains the same. In contrast, *live reloading* is when the entire application is refreshed, and the state of the application is lost. ## Step-through debugging Lambda functions locally * **Note**\ If you're using `sam local start-api`, the local API Gateway instance exposes all of your Lambda functions. However, because you can specify a single debug port, you can only debug one function at a time. You need to call your API before the AWS SAM CLI binds to the port, which allows the debugger to connect. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://awsnotes.dendron.so/compute/aws-serverless-application-model-aws-sam/topics/testing-and-debugging.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.