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---
title: Using the Redoc CLI
---
# Using the Redoc CLI
With Redoc's command-line interface you can bundle your OpenAPI definition and API documentation
(made with Redoc) into a zero-dependency HTML file and locally render your
OpenAPI definition with Redoc.
## Step 1 - Install Redoc CLI
You can install the `redoc-cli` package globally using one of the following package managers:
- [npm](https://docs.npmjs.com/about-npm)
- [yarn](https://classic.yarnpkg.com/en/docs/getting-started)
Or you can install `redoc-cli` using [npx](https://www.freecodecamp.org/news/npm-vs-npx-whats-the-difference/).
### Install Redoc CLI with yarn
To install the `redoc-cli` package globally with yarn:
```bash
yarn global add redoc-cli
```
### Install Redoc with npm
To install the `redoc-cli` package globally with npm:
```bash
npm i -g redoc-cli
```
### Install with `npx`
To install the `redoc-cli` package locally with `npx`, navigate to your project
directory in your terminal, then use the following command:
```bash
npx redoc-cli
```
## Step 2 - Use the CLI
### Redoc CLI commands
The CLI includes the following commands:
- **`redoc-cli serve [spec]`:** Starts a local server with Redoc. You must include the required parameter, spec, which is
a reference to an OpenAPI definition. Options include:
- `--ssr`: Implements a server-side rendering model.
- `--watch`: Automatically reloads the server while you edit your OpenAPI definition.
- `--options`: Customizes your output using [Redoc options](https://redoc.ly/docs/api-reference-docs/configuration/).
To add nested options, use dot notation.
- **`redoc-cli bundle [spec]`:** Bundles `spec` and Redoc into a zero-dependency HTML file. Options include:
- `-t` or `--template`: Uses custom [Handlebars](https://handlebarsjs.com/) templates to render your OpenAPI definition.
- `--templateOptions`: Adds template options you want to pass to your
custom Handlebars template. To add options, use dot notation.
- **`--help`:** Prints help text for the Redoc CLI commands and options.
- **`--version`:** Prints the version of the `redoc-cli` package you have installed.
### Redoc CLI examples
#### Bundle
Bundle with the main color changed to `orange`:
```bash
redoc-cli bundle openapi.yaml --options.theme.colors.primary.main=orange
```
Bundle using a custom Handlebars template and add custom `templateOptions`:
```bash
redoc-cli bundle http://petstore.swagger.io/v2/swagger.json -t custom.hbs --templateOptions.metaDescription "Page meta description"
```
Sample Handlebars template:
```handlebars
<!DOCTYPE html>
<html>
<head>
<meta charset="utf8" />
<title>{{title}}</title>
<!-- needed for adaptive design -->
<meta description="{{{templateOptions.metaDescription}}}">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
padding: 0;
margin: 0;
}
</style>
{{{redocHead}}}
{{#unless disableGoogleFont}}<link href="https://fonts.googleapis.com/css?family=Montserrat:300,400,700|Roboto:300,400,700" rel="stylesheet">{{/unless}}
</head>
<body>
{{{redocHTML}}}
</body>
</html>
```
#### Serve
Serve with the `nativeScrollbars` option set to `true`:
```bash
redoc-cli serve openapi/dist.yaml --options.nativeScrollbars
```

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---
title: Using the Redoc Docker image
---
# Using the Redoc Docker image
Redoc is available as a pre-built Docker image in [Docker Hub](https://hub.docker.com/r/redocly/redoc/).
If you have [Docker](https://docs.docker.com/get-docker/) installed, pull the image with the following command:
```docker
docker pull redocly/redoc
```
Then run the image with the following command:
```docker
docker run -p 8080:80 redocly/redoc
```
The preview starts on port 8080, based on the port used in the command,
and can be accessed at `http://localhost:8080`.
To exit the preview, use `control+C`.
By default Redoc starts with a demo Swagger Petstore OpenAPI definition located at
http://petstore.swagger.io/v2/swagger.json. You can update this URL using
the environment variable `SPEC_URL`.
For example:
```bash
docker run -p 8080:80 -e SPEC_URL=https://api.example.com/openapi.json redocly/redoc
```
## Using a Dockerfile
You can also create a Dockerfile with some predefined environment variables. Check out
a sample [Dockerfile](https://github.com/Redocly/redoc/blob/master/config/docker/Dockerfile)
in our code repo.

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---
title: Using the Redoc HTML element
---
# Using the Redoc HTML element
## TL;DR final code example
```html
<!DOCTYPE html>
<html>
<head>
<title>Redoc</title>
<!-- needed for adaptive design -->
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/css?family=Montserrat:300,400,700|Roboto:300,400,700" rel="stylesheet">
<!--
Redoc doesn't change outer page styles
-->
<style>
body {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<redoc spec-url='http://petstore.swagger.io/v2/swagger.json'></redoc>
<script src="https://cdn.jsdelivr.net/npm/redoc@latest/bundles/redoc.standalone.js"> </script>
</body>
</html>
```
:::attention Running Redoc locally requires an HTTP server
Loading local OpenAPI definitions is impossible without running a web server because of issues with
[same-origin policy](https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy) and
other security reasons.
:::
### Running Redoc locally
If you want to view your Redoc output locally, you can simulate an HTTP server.
#### Using Redocly OpenAPI CLI
Redocly OpenAPI CLI is an open source command-line tool that includes a command
for simulating an HTTP server to provide a preview of your OpenAPI definition locally.
If you have [OpenAPI CLI](https://redoc.ly/docs/cli/#installation-and-usage) installed, `cd` into your
project directory and run the following command:
```bash
openapi preview-docs openapi.yaml
```
By default, without providing a port, the preview starts on port 8080, and can be accessed at `http://localhost:8080`.
To exit the preview, use `control+C`.
#### Using Python
If you have [Python 3](https://www.python.org/downloads/) installed, `cd` into your
project directory and run the following command:
```python
python3 -m http.server
```
If you have [Python 2](https://www.python.org/downloads/) installed, `cd` into your
project directory and run the following command:
```python
python -m SimpleHTTPServer 8000
```
The output after entering the command provides the local URL where the preview can be accessed.
To exit the preview, use `control-C`.
#### Using Node.js
If you have [Node.js](https://nodejs.org/en/download/) installed, install `http-server`
using the following npm command:
```bash
npm install -g http-server
```
Then, `cd` into your project directory and run the following command:
```node
http-server
```
The output after entering the command provides the local URL where the preview can be accessed.
To exit the preview, use `control-C`.
## Step 1 - Install Redoc
You can install Redoc using one of the following package managers:
- [npm](https://docs.npmjs.com/about-npm)
- [yarn](https://classic.yarnpkg.com/en/docs/getting-started)
:::attention Initialize your package manager
If you do not have a `package.json` file in your project directory,
you need to add one by initializing npm or yarn in your project. Use the command `npm init` for npm,
or `yarn init` for yarn. These initialization commands will lead you through the process
of creating a `package.json` file in your project.
For more information, see
[Creating a package.json file](https://docs.npmjs.com/creating-a-package-json-file)
in the npm documentation or [Yarn init](https://classic.yarnpkg.com/en/docs/cli/init/)
in the yarn documentation.
:::
### Install Redoc with yarn
After navigating to your project directory in your terminal, use the following command:
```bash
yarn add redoc
```
### Install Redoc with npm
After navigating to your project directory in your terminal, use the following command:
```bash
npm i redoc
```
## Step 2 - Reference the Redoc script
You can reference the Redoc script using either a link to the files hosted on a CDN
or the files located in your `node modules` folder.
### CDN link
To reference the Redoc script with a CDN link:
```html
<script src="https://cdn.jsdelivr.net/npm/redoc@latest/bundles/redoc.standalone.js"> </script>
```
### Node modules link
To reference the Redoc script with a node modules link:
```html
<script src="node_modules/redoc/bundles/redoc.standalone.js"> </script>
```
## Step 3 - Add the <redoc> element
You can add the <redoc> element to your HTML page and reference your OpenAPI
definition using the `spec-url` attribute, or you can initialize Redoc using
a globally exposed Redoc object.
### Using the `spec-url` attribute
To add the <redoc> element with the `spec-url` attribute:
```html
<redoc spec-url="url/to/your/spec"></redoc>
```
#### Examples
```html
<redoc spec-url="http://petstore.swagger.io/v2/swagger.json"></redoc>
```
You can also use a local file (JSON or YAML) in your project, for instance:
```html
<redoc spec-url="dist.json"></redoc>
```
### Using a Redoc object
To add the <redoc> element with a globally exposed Redoc object:
```js
Redoc.init(specOrSpecUrl, options, element, callback)
```
- `specOrSpecUrl`: Either a JSON object with the OpenAPI definition or a URL to the
definition in JSON or YAML format.
- `options`: See [options object](https://redoc.ly/docs/api-reference-docs/configuration/) reference.
- `element`: DOM element Redoc will be inserted into.
- `callback`(optional): Callback to be called after Redoc has been fully rendered.
It is also called on errors with `error` as the first argument.
#### Examples
```html
<script>
Redoc.init('http://petstore.swagger.io/v2/swagger.json', {
scrollYOffset: 50
}, document.getElementById('redoc-container'))
</script>
```
You can also use a local file (JSON or YAML) in your project, for instance:
```html
<script>
Redoc.init('dist.yaml', {
scrollYOffset: 50
}, document.getElementById('redoc-container'))
</script>
```

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---
title: Redoc quickstart guide
---
# Redoc quickstart guide
This guide includes step-by-step instructions for how to get started using
Redoc to render your OpenAPI definition.
Redoc offers multiple options for rendering your OpenAPI definition.
You should select the option that best fits your needs.
The following options are supported:
- **[Live demo](https://redocly.github.io/redoc/):**
The live demo offers a fast way to see how your OpenAPI will render with Redoc.
- **[HTML element](./html.md):**
Using the HTML element works well for typical website deployments.
- **[React component](./react.md):**
Using the React component is an option for users with a React-based application.
- **[Docker image](./docker.md):**
Using the Docker image works in a container-based deployment.
- **[CLI](./cli.md):**
Using the CLI is an option for users who prefer to use a command-line interface.
## Before you start
You will need an OpenAPI definition. For testing purposes, you can use one of the following sample OpenAPI definitions:
- OpenAPI 3.0
- [Rebilly Users OpenAPI Definition](https://raw.githubusercontent.com/Rebilly/api-definitions/main/openapi/users.yaml)
- [Swagger Petstore Sample OpenAPI Definition](https://petstore3.swagger.io/api/v3/openapi.json)
- OpenAPI 2.0
- [Thingful OpenAPI Definition](https://raw.githubusercontent.com/thingful/openapi-spec/master/spec/swagger.yaml)
- [Fitbit Plus OpenAPI Definition](https://raw.githubusercontent.com/TwineHealth/TwineDeveloperDocs/master/spec/swagger.yaml)
For more information on the OpenAPI specification, refer to the [Learning OpenAPI 3](https://redoc.ly/docs/resources/learning-openapi/)
section in the documentation.
## Live demo online
If you want to see how ReDoc will render your OpenAPI definition, you can try it out online at https://redocly.github.io/redoc/.
A version of the Swagger Petstore API is displayed by default. To test it with your own OpenAPI definition, enter the URL for your
definition and select the **TRY IT** button.

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---
title: Using the Redoc React component
---
# Using the Redoc React component
## Before you start
Install the following dependencies required by Redoc if you do not already have them installed:
- `react`
- `react-dom`
- `mobx`
- `styled-components`
- `core-js`
If you have npm installed, you can install these dependencies using the following command:
```js
npm i react react-dom mobx styled-components core-js
```
## Step 1 - Import the `RedocStandalone` component
```js
import { RedocStandalone } from 'redoc';
```
## Step 2 - Use the component
You can either link to your OpenAPI definition with a URL, using the following format:
```react
<RedocStandalone specUrl="url/to/your/spec"/>
```
Or you can pass your OpenAPI definition as an object, using the following format:
```js
<RedocStandalone spec={/* spec as an object */}/>
```
## Optional - Pass options
Options can be passed into the RedocStandalone component to alter how it renders.
For example:
```js
<RedocStandalone
specUrl="http://petstore.swagger.io/v2/swagger.json"
options={{
nativeScrollbars: true,
theme: { colors: { primary: { main: '#dd5522' } } },
}}
/>
```
For more information on configuration options, refer to the
[Configuration options for Reference docs](https://redoc.ly/docs/api-reference-docs/configuration/)
section of the documentation. Options available for Redoc are noted,
"Supported in Redoc CE".
## Optional - Specify `onLoaded` callback
You can also specify the `onLoaded` callback, which is called each time Redoc
is fully rendered or when an error occurs (with an error as the first argument).
```js
<RedocStandalone
specUrl="http://petstore.swagger.io/v2/swagger.json"
onLoaded={error => {
if (!error) {
console.log('Yay!');
}
}}
/>
```