Rust and WebAssembly Serverless Functions in Vercel Serverless APIs with Deno and Vercel - hyper That means you only have to pay for the computing resources you use. Finally, push your project up to your source repository, and Vercel will use your vercel.json configuration file to build your Express API and deploy it as a serverless function.. Once the build process is complete, feel free to visit the .vercel.app URL Vercel provides automatically to see the words "Express on Vercel".. As we discussed above, the reason to use WebAssembly, and WasmEdge, is to further improve performance. Vercel Serverless functions send response cookie - Stack Overflow But moving forward I'll assume that you have a Vercel project . I am using Vercel serverless function to run a post request to webhook. Rust and WebAssembly Serverless Functions in Vercel To write our API serverless function in vercel, create a new file called whatever.js (name is up to you) inside a folder called '/api', As default, vercel provides Nodejs version 14.x if not defined. Originally this post was going to be about how easy making microservice APIs is using micro, but then I discovered that micro was designed to be ran within a container, and that Vercel has better support for adding APIs to any Node project using it's Serverless Helper Functions. File could also be writtern in typescript with .ts extension. Vercel can be used to deploy any frontend application to its cloud hosting but it also allows you to run serverless functions, using AWS Lambda and Google Cloud Functions under the hood. Contribute to alexdevero/serverless-vercel-demo development by creating an account on GitHub. npm i -g vercel@latest vercel login Now also provides us with the option to start from a boilerplate by using now init. The standard Node.js setHeader works with the standard Set-Cookie header. For those who may not be familiar with Next's API routes, they are essentially node functions that deploy as serverless lambdas. How to deploy an Express API to Vercel | Shadow Smith For this post, I've created a demo repository vercel-ruby for demonstration purposes.