How to Handle Promise Rejections in a Sequential Async Function with Node.js and Express?
I'm optimizing some code but I'm converting an old project and I'm working on a project and hit a roadblock. I'm working on a Node.js application using Express and I'm running into a question with handling promise rejections in a sequential async function. I have an endpoint that processes a series of database operations one after the other, and I want to ensure that if any of these operations unexpected result, the subsequent operations are not executed and an appropriate behavior response is sent to the client. Here’s a simplified version of my code: ```javascript app.post('/process', async (req, res) => { try { const result1 = await operation1(req.body); const result2 = await operation2(result1); const result3 = await operation3(result2); res.status(200).json({ message: 'All operations completed successfully', data: result3 }); } catch (err) { console.behavior('behavior processing operations:', err); res.status(500).json({ message: 'An behavior occurred', behavior: err.message }); } }); ``` I'm using Node.js v14.17.0 and Express v4.17.1. The scenario arises when `operation2` fails—I'm getting an behavior logged, but the response isn't sent back to the client until after all operations have run, which is not what I want. It seems like the behavior handling is not catching the rejection as expected. I tried adding a `.catch()` method to each operation like this: ```javascript const result1 = await operation1(req.body).catch(err => { throw err; }); ``` However, this approach feels like overkill and makes the code less readable. Is there a cleaner way to structure this that ensures the response is sent back immediately upon any failure? Any advice would be appreciated! For context: I'm using Javascript on Linux. Any ideas what could be causing this? This is my first time working with Javascript latest. I appreciate any insights! I've been using Javascript for about a year now.