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+---
+title: safeJS
+# linktitle:
+description: Declares the provided string as a known safe JavaScript string.
+godocref: https://golang.org/src/html/template/content.go?s=2548:2557#L51
+date: 2017-02-01
+publishdate: 2017-02-01
+lastmod: 2017-02-01
+categories: [functions]
+menu:
+  docs:
+    parent: "functions"
+#tags: [strings]
+signature: ["safeJS INPUT"]
+workson: []
+hugoversion:
+relatedfuncs: []
+deprecated: false
+draft: false
+aliases: []
+---
+
+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>
+