Implementing AWS Lambda with Node.js for serverless feature development in a React app
I'm migrating some code and I'm having a hard time understanding Currently developing a feature for a React application where I need to implement serverless functions using AWS Lambda... The goal is to process user data asynchronously and interact with DynamoDB for data storage without the overhead of managing servers. I’ve read through the AWS documentation, but I’m struggling with how to make seamless calls to the Lambda function from my React app. To begin, I set up the Lambda function with a simple handler: ```javascript exports.handler = async (event) => { const responseMessage = 'Hello from Lambda!'; return { statusCode: 200, body: JSON.stringify({ message: responseMessage }) }; }; ``` This function is triggered via API Gateway, which I believe is configured properly, as I can run the function from the AWS console and see the expected output. To call this Lambda function from my React component, I tried using fetch: ```javascript const callLambda = async () => { const response = await fetch('https://your-api-id.execute-api.region.amazonaws.com/dev', { method: 'GET' }); const data = await response.json(); console.log(data); }; ``` However, the response does not return as expected. I checked CORS settings, ensuring that my API Gateway is set to allow requests from my React app’s domain. Running into a CORS error in the browser console prevents the fetch from completing successfully. After some digging, I added the following CORS configuration in the API Gateway: ```json { "statusCode": 200, "headers": { "Access-Control-Allow-Origin": "*", "Access-Control-Allow-Methods": "OPTIONS,GET", "Access-Control-Allow-Headers": "Content-Type" } } ``` Despite this, the network tab still shows a 403 Forbidden error when I try to call the endpoint from my application. I also tried invoking the function directly from Postman, which worked fine, pointing to a potential issue with how the request is configured in the React app. I’m curious if anyone has suggestions on the best practices for integrating AWS Lambda with a React frontend, ensuring that the calls are correctly made and the responses handled efficiently. Any insight into debugging these AWS configurations would also be greatly appreciated! My development environment is Linux. This is my first time working with Javascript 3.9. Could this be a known issue?