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 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. Deploying Serverless Functions with Vercel gives you the ability to use path segments through file names instead of a complex routes file. For an advanced configuration and structure, you can create a vercel.json file to use Runtimes and other customizations. When using path segments, any dynamic filename can be used, this is indicated by the use of square brackets. 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. Serverless Functions. More examples of applications you can deploy paired with Serverless Functions can be found in the Vercel repository on GitHub. To deploy Serverless Functions without any additional configuration, you can put files with extensions matching supported languages and exported functions in the /api directory at your project's root. You can the edit the api/hello.js Serverless Function to use the imported files like so: const { readFileSync } = require('fs') const { join } = require('path') const file = readFileSync(join(__dirname, '_files', 'ci.yml'), 'utf8') An example Serverless Function that reads from the filesystem. Check out the Environment Variables documentation to learn more. We do, however, recommend using the api directory to keep things simple for your project. Not only did Vercel make deployments effortless, it made them scalable and global by default. Together with Vercel functions, you are able to build dynamic web apps without any backend. slack commands, and more. How can I use files in Serverless Functions on Vercel. At present, it is not possible to import files in a Next.js SSR page or function given this issue. 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. The resulting deployment can be found here: https://path-segment-with-node.now-examples.now.sh/api/name/world. Vercel functions are stateless just like other FaaS. 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. Given the serverless nature of the Vercel platform, this is handled differently than in a traditional running server environment. If you would like to override the dev command, you can do so from the Build & Development Settings of your project. Custom Memory & Execution Duration. Thanks to monorepo support, you could develop static websites and serverless functions within the same repository. For example, with 1,792MB memory configured, a Serverless Function will have the equivalent of one vCPU. It sounds cool but there are still challenges. For further information, please refer to the advanced Node.js usage section in the Vercel documentation. I promise you'll really enjoy the experience of creating and deploying serverless functions with Vercel. 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 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. You can get started with many of the Vercel examples by deploying them from the Quickstarts section. 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. An example vercel.json file that imports files into Serverless Functions at runtime. You can configure Environment Variables for your Serverless Functions directly from Project Settings. You can use Serverless Functions to handle user authentication, form submission, database queries, custom 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.

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