A Lambda function handler is the entry point for your AWS Lambda function. It's the method or function that AWS Lambda invokes when executing your code. The handler processes the input event and returns a response. Its structure and signature depend on the programming language runtime you're using.
Defined in the format fileName.functionName (e.g., index.handler)
Receives two arguments: event (input data) and context (metadata)
Must be exported or publicly accessible, depending on the language
0-2 years experience
Should return a response or promise (async) in supported runtimes
Handles any initialization or cleanup tasks inside the function body
2-5 years experience
5-8 years experience
8+ years experience
