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142 lines
3.2 KiB
Markdown
142 lines
3.2 KiB
Markdown
---
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title: data.GetJSON
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description: Returns a JSON object from a local or remote JSON file, or an error if the file does not exist.
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categories: []
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keywords: []
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action:
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aliases: [getJSON]
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related:
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- functions/data/GetCSV
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- functions/resources/Get
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- functions/resources/GetRemote
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- methods/page/Resources
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returnType: any
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signatures: ['data.GetJSON INPUT... [OPTIONS]']
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toc: true
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---
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Given the following directory structure:
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```text
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my-project/
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└── other-files/
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└── books.json
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```
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Access the data with either of the following:
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```go-html-template
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{{ $data := getJSON "other-files/books.json" }}
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{{ $data := getJSON "other-files/" "books.json" }}
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```
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{{% note %}}
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When working with local data, the filepath is relative to the working directory.
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{{% /note %}}
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Access remote data with either of the following:
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```go-html-template
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{{ $data := getJSON "https://example.org/books.json" }}
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{{ $data := getJSON "https://example.org/" "books.json" }}
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```
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The resulting data structure is a JSON object:
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```json
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[
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{
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"author": "Victor Hugo",
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"rating": 5,
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"title": "Les Misérables"
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},
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{
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"author": "Victor Hugo",
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"rating": 4,
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"title": "The Hunchback of Notre Dame"
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}
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]
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```
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## Options
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Add headers to the request by providing an options map:
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```go-html-template
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{{ $opts := dict "Authorization" "Bearer abcd" }}
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{{ $data := getJSON "https://example.org/books.json" $opts }}
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```
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Add multiple headers using a slice:
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```go-html-template
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{{ $opts := dict "X-List" (slice "a" "b" "c") }}
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{{ $data := getJSON "https://example.org/books.json" $opts }}
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```
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## Global resource alternative
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Consider using the [`resources.Get`] function with [`transform.Unmarshal`] when accessing a global resource.
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```text
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my-project/
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└── assets/
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└── data/
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└── books.json
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```
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```go-html-template
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{{ $data := "" }}
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{{ $p := "data/books.json" }}
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{{ with resources.Get $p }}
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{{ $data = . | transform.Unmarshal }}
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{{ else }}
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{{ errorf "Unable to get resource %q" $p }}
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{{ end }}
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```
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## Page resource alternative
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Consider using the [`Resources.Get`] method with [`transform.Unmarshal`] when accessing a page resource.
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```text
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my-project/
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└── content/
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└── posts/
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└── reading-list/
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├── books.json
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└── index.md
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```
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```go-html-template
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{{ $data := "" }}
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{{ $p := "books.json" }}
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{{ with .Resources.Get $p }}
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{{ $data = . | transform.Unmarshal }}
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{{ else }}
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{{ errorf "Unable to get resource %q" $p }}
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{{ end }}
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```
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## Remote resource alternative
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Consider using the [`resources.GetRemote`] function with [`transform.Unmarshal`] when accessing a remote resource to improve error handling and cache control.
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```go-html-template
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{{ $data := "" }}
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{{ $u := "https://example.org/books.json" }}
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{{ with resources.GetRemote $u }}
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{{ with .Err }}
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{{ errorf "%s" . }}
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{{ else }}
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{{ $data = . | transform.Unmarshal }}
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{{ end }}
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{{ else }}
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{{ errorf "Unable to get remote resource %q" $u }}
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{{ end }}
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```
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[`Resources.Get`]: methods/page/Resources
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[`resources.GetRemote`]: /functions/resources/getremote
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[`resources.Get`]: /functions/resources/get
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[`transform.Unmarshal`]: /functions/transform/unmarshal
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