If you have an api directory like the above examples on this page, you can run the following command to start a local development environment that supports your serverless API and allows you to develop locally, just make sure to install your project's dependencies first with npm install: Starting a local development environment using Vercel CLI, for Serverless Functions. For more information on what to do next, we recommend the following articles: Read more about API functionality with Next.js, https://node-echo-api.now-examples.now.sh/api/?name=example, Supported Languages for Serverless Functions documentation, https://path-segment-with-node.now-examples.now.sh/api/name/world. More information and documentation can be found on the Vercel website. During local development with vercel dev, you may wish to provide your application with environment variables. The following Node.js example code could then use the path segment in its functionality when requested: An example of a Node.js Serverless Function that takes a name path segment and returns a string using it. It sounds cool but there are still challenges. The resulting deployment can be found here: https://path-segment-with-node.now-examples.now.sh/api/name/world. Check out the Environment Variables documentation to learn more. Then, push to your connected Git repository using a Vercel for Git to receive a deployment automatically. Vercel functions are stateless just like other FaaS. Thanks to monorepo support, you could develop static websites and serverless functions within the same repository. Creating a file using any of the supported languages in the /api directory and wrapping the filename in square brackets, such as [name].js will provide you with a file that takes a path segment and gives it to the function when requested with a value. Custom Memory & Execution Duration. Deploying Serverless Functions with Vercel gives you the ability to use path segments through file names instead of a complex routes file. Memory: 1024 MB (1 GB) Maximum Execution Duration: 10s (Free), 60s (Pro), 600s (Business), or 900s (Enterprise) If you would like to override the dev command, you can do so from the Build & Development Settings of your project. Given the serverless nature of the Vercel platform, this is handled differently than in a traditional running server environment. The filename for the path segment is used solely for the purpose of providing a key name for accessing the value on the req.query object. With Vercel, you can deploy Serverless Functions, which are pieces of code written with backend languages that take an HTTP request and provide a response. The above example echoes the body, path query, and cookies, passed with the request object, as a JSON object using helper methods provided through the Request and Response. Then, all you need to do, to have a live API, is push to your connected Git repository using a Vercel for Git to receive a deployment automatically. This is just the tip of the iceberg when it comes to serverless, including CORS and middleware. At present, it is not possible to import files in a Next.js SSR page or function given this issue. For an advanced configuration and structure, you can create a vercel.json file to use Runtimes and other customizations. We do, however, recommend using the api directory to keep things simple for your project. You can use Serverless Functions to handle user authentication, form submission, database queries, custom When using Serverless Functions, you may wish to include files at runtime. With Vercel, you can deploy Serverless Functions, which are pieces of code written with backend languages that take an HTTP request and provide a response. For all supported languages, see the Supported Languages for Serverless Functions documentation. Not only did Vercel make deployments effortless, it made them scalable and global by default. slack commands, and more. To deploy a serverless Node.js API, provide a main export function like the following, in a .js file within the /api directory: An example Node.js Serverless Function using Express.js-like helper methods from the Request and Response objects. Note: In a Next.js application, use `/pages/api` for Node.js functions and use `/api` for all other languages. Within the /api directory of your projects, Vercel will automatically recognize the languages listed on this page, through their file extensions, and serve them as Serverless Function. The resulting deployment will contain your Node.js Serverless Function and will provide you with a URL like the following, with your API ready to go: https://node-echo-api.now-examples.now.sh/api/?name=example. For example, with 1,792MB memory configured, a Serverless Function will have the equivalent of one vCPU. You can the edit the api/hello.js Serverless Function to use the imported files like so: An example Serverless Function that reads from the filesystem. I promise you'll really enjoy the experience of creating and deploying serverless functions with Vercel. You can use Serverless Functions to handle user authentication, form submission, database queries, custom slack commands, and more. You can configure Environment Variables for your Serverless Functions directly from Project Settings. Serverless Functions. Serverless Functions are allocated CPU power according to the amount of memory configured for them. Today, we are excited to announce one command to run it all on localhost: vercel dev. For example, creating a name directory (within /api) that contains a [name].js file will allow you to receive the path segment entered when accessing /api/name/your-name on the req.query.name object.