![]() The variable must be a string, and must have a value of either 'nodejs' or 'edge' runtime. To do so, declare a variable called runtime and export it. You can specify a runtime for individual route segments in your Next.js application. Depending on the amount of traffic your site recieves, this could be a frequent occurrence as the functions are not frequently "warm". ![]() The downside compared to routes using the Edge is that it can take hundreds of milliseconds for Serverless Functions to boot up before they begin processing requests. ![]() With Serverless Functions on Vercel, for example, your overall code size is 50MB including imported packages, fonts, and files. Serverless is ideal if you need a scalable solution that can handle more complex computational loads than the Edge Runtime. Alternatively, you can consider deploying your Next.js application to a serverless platform like Vercel, which will handle this for you. However, it's not as fast to start up as routes using the Edge runtime.ĭeploying your Next.js application to a Node.js server will require managing, scaling, and configuring your infrastructure. Using the Node.js runtime gives you access to all Node.js APIs, and all npm packages that rely on them. The Edge Runtime's speed comes from its minimal use of resources, but that can be limiting in many scenarios.įor example, code executed in the Edge Runtime on Vercel cannot exceed between 1 MB and 4 MB, this limit includes imported packages, fonts and files, and will vary depending on your deployment infrastructure. The Edge Runtime is ideal if you need to deliver dynamic, personalized content at low latency with small, simple functions. In Next.js, the lightweight Edge Runtime is a subset of available Node.js APIs. If you want a more in-depth analysis of the differences, check out the sections below. This table shows the major differences at a glance. BASH That will pass the user USERID as 239482 and the USERKEY as foobar. The below code runs app.js and set USERID and USERKEY. There are many considerations to make when choosing a runtime. The process core module of Node.js provides the env property which hosts all the environment variables that were set at the moment the process was started. However, you can opt into different runtimes (e.g. Both runtimes can also support streaming depending on your deployment infrastructure.īy default, the app directory uses the Node.js runtime. Please refer to the Node.js Docs and Edge Docs for the full list of available APIs. Next.js has two server runtimes where you can render parts of your application code:Įach runtime has its own set of APIs. In the context of Next.js, "runtime" refers to the set of libraries, APIs, and general functionality available to your code during execution.
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