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|
---
title: openapi3.Unmarshal
description: Unmarshals the given resource into an OpenAPI 3 document.
categories: []
keywords: []
action:
aliases: []
related: []
returnType: openapi3.OpenAPIDocument
signatures: ['openapi3.Unmarshal RESOURCE']
---
Use the `openapi3.Unmarshal` function with [global], [page], or [remote] resources.
[global]: /getting-started/glossary/#global-resource
[page]: /getting-started/glossary/#page-resource
[remote]: /getting-started/glossary/#remote-resource
[OpenAPI]: https://www.openapis.org/
For example, to work with a remote [OpenAPI] definition:
```go-html-template
{{ $url := "https://raw.githubusercontent.com/OAI/OpenAPI-Specification/main/examples/v3.0/petstore.json" }}
{{ $api := "" }}
{{ with resources.GetRemote $url }}
{{ with .Err }}
{{ errorf "%s" . }}
{{ else }}
{{ $api = . | openapi3.Unmarshal }}
{{ end }}
{{ else }}
{{ errorf "Unable to get remote resource %q" $url }}
{{ end }}
```
To inspect the data structure:
```go-html-template
<pre>{{ debug.Dump $api }}</pre>
```
To list the GET and POST operations for each of the API paths:
```go-html-template
{{ range $path, $details := $api.Paths }}
<p>{{ $path }}</p>
<dl>
{{ with $details.Get }}
<dt>GET</dt>
<dd>{{ .Summary }}</dd>
{{ end }}
{{ with $details.Post }}
<dt>POST</dt>
<dd>{{ .Summary }}</dd>
{{ end }}
</dl>
{{ end }}
```
Hugo renders this to:
```html
<p>/pets</p>
<dl>
<dt>GET</dt>
<dd>List all pets</dd>
<dt>POST</dt>
<dd>Create a pet</dd>
</dl>
<p>/pets/{petId}</p>
<dl>
<dt>GET</dt>
<dd>Info for a specific pet</dd>
</dl>
```
|
