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# Installation
## Distribution channels
### NPM Registry
We publish two modules to npm: **`swagger-ui`** and **`swagger-ui-dist`**.
**`swagger-ui`** is meant for consumption by JavaScript web projects that include module bundlers, such as Webpack, Browserify, and Rollup. Its main file exports Swagger UI's main function, and the module also includes a namespaced stylesheet at `swagger-ui/dist/swagger-ui.css`. Here's an example:
```javascript
import SwaggerUI from 'swagger-ui'
// or use require, if you prefer
const SwaggerUI = require('swagger-ui')
SwaggerUI({
dom_id: '#myDomId'
})
```
In contrast, **`swagger-ui-dist`** is meant for server-side projects that need assets to serve to clients. The module, when imported, includes an `absolutePath` helper function that returns the absolute filesystem path to where the `swagger-ui-dist` module is installed.
_Note: we suggest using `swagger-ui` when your tooling makes it possible, as `swagger-ui-dist`
will result in more code going across the wire._
The module's contents mirrors the `dist` folder you see in the Git repository. The most useful file is `swagger-ui-bundle.js`, which is a build of Swagger UI that includes all the code it needs to run in one file. The folder also has an `index.html` asset, to make it easy to serve Swagger UI like so:
```javascript
const express = require('express')
const pathToSwaggerUi = require('swagger-ui-dist').absolutePath()
const app = express()
app.use(express.static(pathToSwaggerUi))
app.listen(3000)
```
The module also exports `SwaggerUIBundle` and `SwaggerUIStandalonePreset`, so
if you're in a JavaScript project that can't handle a traditional npm module,
you could do something like this:
```js
var SwaggerUIBundle = require('swagger-ui-dist').SwaggerUIBundle
const ui = SwaggerUIBundle({
url: "https://petstore.swagger.io/v2/swagger.json",
dom_id: '#swagger-ui',
presets: [
SwaggerUIBundle.presets.apis,
SwaggerUIBundle.SwaggerUIStandalonePreset
],
layout: "StandaloneLayout"
})
```
`SwaggerUIBundle` is equivalent to `SwaggerUI`.
### Docker
You can pull a pre-built docker image of the swagger-ui directly from Docker Hub:
```
docker pull swaggerapi/swagger-ui
docker run -p 80:8080 swaggerapi/swagger-ui
```
Will start nginx with Swagger UI on port 80.
Or you can provide your own swagger.json on your host
```
docker run -p 80:8080 -e SWAGGER_JSON=/foo/swagger.json -v /bar:/foo swaggerapi/swagger-ui
```
The base URL of the web application can be changed by specifying the `BASE_URL` environment variable:
```
docker run -p 80:8080 -e BASE_URL=/swagger -e SWAGGER_JSON=/foo/swagger.json -v /bar:/foo swaggerapi/swagger-ui
```
This will serve Swagger UI at `/swagger` instead of `/`.
For more information on controlling Swagger UI through the Docker image, see the Docker section of the [Configuration documentation](configuration.md#docker).
### unpkg
You can embed Swagger UI's code directly in your HTML by using unpkg's interface:
```html
<script src="//unpkg.com/swagger-ui-dist@3/swagger-ui-bundle.js"></script>
<!-- `SwaggerUIBundle` is now available on the page -->
```
See [unpkg's main page](https://unpkg.com/) for more information on how to use unpkg.
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