To make sure your upload feature is working fine, you should upload files to AWS S3. Even if you upload files to /tmp folder, they will exist for a short time, while the function is still “warm”. That’s because the AWS Lambda function is read-only.
Websockets don’t work with AWS Lambda.Some of the important limitations of serverless Express apps are the following: Serverless Express apps sound awesome, but they have some limitations. Limitations of serverless Express.js apps
To read more about the ways your business benefits through serverless, see this article. Your serverless app also saves your money! Also, the first million requests each month are free, as part of a free tier. With AWS Lambda, you pay only for requests you used. You also saved money besides having a stable app under a higher load. Serverless Express.js app under heavy load.īut this is not your only benefit. New functions are ready a few moments after the API Gateway receives the request. It is possible, because AWS Lambda will auto scale up to 1000 concurrent executions by default. With a serverless app, your army of users can continue growing and your app will still be working. A simple, traditionally hosted Express.js app, with a single request.įor example, the simplest Express app looks like the following code snippet: 'use strict' const express = require('express')const app = express() app.get('/', (req, res) => res.send('Hello world!')) const port = || 3000app.listen(port, () => console.log(`Server is listening on port $Īnd if you visit the link from that response in your browser, it prints “Hello world!” It worked! ? Serverless Express app. For a simple app, you just need to add a few routes and route handlers. Express is de facto the most popular Node.js framework.Įxpress apps are easy to build. If you are a Node.js developer or you’ve built an API with Node.js, there’s a big chance you used Express.js. By Slobodan Stojanović Express.js and AWS Lambda - a serverless love story
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