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66 lines
2.3 KiB
Markdown
66 lines
2.3 KiB
Markdown
[](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/pass-server-data)
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# Pass Server Data Directly to a Next.js Page during SSR
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## How to use
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### Using `create-next-app`
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Execute [`create-next-app`](https://github.com/segmentio/create-next-app) with [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) or [npx](https://github.com/zkat/npx#readme) to bootstrap the example:
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```bash
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npx create-next-app --example pass-server-data pass-server-data-app
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# or
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yarn create next-app --example pass-server-data pass-server-data-app
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```
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### Download manually
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Download the example:
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```bash
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curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/pass-server-data
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cd pass-server-data
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```
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Install it and run:
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```bash
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npm install
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npm run dev
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# or
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yarn
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yarn dev
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```
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Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))
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```bash
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now
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```
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## The idea behind the example
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If you already have a custom server which has local data (for instance cached data from an API call, or data read
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from a file at startup) that you wish to make available in the Next.js page, you can pass that data in the query
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parameter of `nextApp.render()`.
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This is not the only way to pass data. You could also expose an endpoint and make a `fetch()` call to localhost, or you could
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import server-side code with `eval` (necessary to prevent webpack from trying to package your server code). However both
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solutions leave something to be desired in either performance or elegance.
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This example shows the express server at `server.js` reading in a file at load time with static data (this could also have been
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data cached from an API call) in `operations/get-item.js`. It has two routes: a home page, and an item page. The item page uses
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data from the get-item operation, passed as a query parameter in `routes/item.js`.
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We use this data in `pages/item.js` if rendered server-side, or make a fetch request if rendered client-side.
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The server knows whether or not to use next.js to render the route based on the Accept header, which will be
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`application/json` when we fetch client-side.
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Take a look at the following files:
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* server.js
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* routes/item.js
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* pages/item.js
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* operations/get-item.js
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