---
url: /custom-pages/server-side-pages.md
description: Server-side pages run on the MODLR server instead of in the browser.
---

# Introduction

Server-side pages run on the MODLR server instead of in the browser. They are useful when code needs secure access to model operations, file handling, integrations, or other process-function capabilities.

## What server-side pages can use

* MODLR process functions.
* Server-side JavaScript for automation and orchestration.
* Logic that should not be exposed to the browser.

## What server-side pages cannot use

Server-side pages do not have access to browser APIs such as the DOM, window events, or client-side rendering behavior.

## Function availability

Most server-side page functions are documented in the process function reference.

* Use [Process Functions](/process-functions/) for the full list of available server-side functions.
* Use [Available Functions](/custom-pages/server-side-functions) for server-side runtime-specific helpers.