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+---
+title: safe.JS
+linkTitle: safeJS
+description: Declares the provided string as a known safe JavaScript string.
+categories: [functions]
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: [safeJS]
+  returnType: template.JS
+  signatures: [safe.JS INPUT]
+relatedFunctions:
+  - safe.CSS
+  - safe.HTML
+  - safe.HTMLAttr
+  - safe.JS
+  - safe.JSStr
+  - safe.URL
+aliases: [/functions/safejs]
+---
+
+In this context, *safe* means the string encapsulates a known safe EcmaScript5 Expression (e.g., `(x + y * z())`).
+
+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.
+
+Example: Given `hash = "619c16f"` defined in the front matter of your `.md` file:
+
+* <span class="good">`<script>var form_{{ .Params.hash | safeJS }};…</script>` &rarr; `<script>var form_619c16f;…</script>`</span>
+* <span class="bad">`<script>var form_{{ .Params.hash }};…</script>` &rarr; `<script>var form_"619c16f";…</script>`</span>