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66 lines
1.8 KiB
Markdown
66 lines
1.8 KiB
Markdown
---
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title: safe.JS
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description: Declares the given string as a safe JavaScript expression.
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categories: []
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keywords: []
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action:
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aliases: [safeJS]
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related:
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- functions/safe/CSS
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- functions/safe/HTML
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- functions/safe/HTMLAttr
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- functions/safe/JSStr
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- functions/safe/URL
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returnType: template.JS
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signatures: [safe.JS INPUT]
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toc: true
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aliases: [/functions/safejs]
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---
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## Introduction
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{{% include "functions/_common/go-html-template-package.md" %}}
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## Usage
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Use the `safe.JS` function to encapsulate a known safe EcmaScript5 Expression.
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Template authors are responsible for ensuring that typed expressions do not break the intended precedence and that there is no statement/expression ambiguity as when passing an expression like `{ foo: bar() }\n['foo']()`, which is both a valid Expression and a valid Program with a very different meaning.
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Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.
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Using the `safe.JS` function to include valid but untrusted JSON is not safe. A safe alternative is to parse the JSON with the [`transform.Unmarshal`] function and then pass the resultant object into the template, where it will be converted to sanitized JSON when presented in a JavaScript context.
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[`transform.Unmarshal`]: /functions/transform/unmarshal/
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See the [Go documentation] for details.
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[Go documentation]: https://pkg.go.dev/html/template#JS
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## Example
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Without a safe declaration:
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```go-html-template
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{{ $js := "x + y" }}
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<script>const a = {{ $js }}</script>
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```
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Hugo renders the above to:
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```html
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<script>const a = "x + y"</script>
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```
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To declare the string as safe:
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```go-html-template
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{{ $js := "x + y" }}
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<script>const a = {{ $js | safeJS }}</script>
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```
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Hugo renders the above to:
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```html
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<script>const a = x + y</script>
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```
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