The client code can then read `window.SERVER_DATA` to use it. Then, on the server, you can replace `_SERVER_DATA_` with a JSON of real data right before sending the response. Similarly to the previous section, you can leave some placeholders in the HTML that inject global variables, for example: # Injecting Data from the Server into the Page It also increases the likelihood that each route of your application will be picked up by search engines. The primary benefit of pre-rendering is that you get the core content of each page _with_ the HTML payload-regardless of whether or not your JavaScript bundle successfully downloads. There are also opportunities to use this outside of static hosting, to take the pressure off the server when generating and caching routes. These pages will then seamlessly become active, or “hydrated”, when the JavaScript bundle has loaded. If you’re hosting your `build` with a static hosting provider you can use () to generate HTML pages for each route, or relative link, in your application. However duplicating it also works fine in simple cases. If you use a Node server, you can even share the route matching logic between the client and the server. Just make sure to sanitize and escape the interpolated values so that they are safe to embed into HTML! Then, on the server, regardless of the backend you use, you can read `index.html` into memory and replace `_OG_TITLE_`, `_OG_DESCRIPTION_`, and any other placeholders with values depending on the current URL.
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