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+---
+title: fmt.Warnidf
+description: Log a suppressible WARNING from a template.
+categories: []
+keywords: []
+action:
+  aliases: [warnidf]
+  related:
+    - functions/fmt/Errorf
+    - functions/fmt/Erroridf
+    - functions/fmt/Warnf
+  returnType: string
+  signatures: ['fmt.Warnidf ID FORMAT [INPUT]']
+aliases: [/functions/warnidf]
+---
+
+{{< new-in 0.123.0 >}}
+
+{{% include "functions/fmt/_common/fmt-layout.md" %}}
+
+The `warnidf` function evaluates the format string, then prints the result to the WARNING log. Unlike the [`warnf`] function, you may suppress warnings logged by the `warnidf` function by adding the message ID to the `ignoreLogs` array in your site configuration.
+
+This template code:
+
+```go-html-template
+{{ warnidf "warning-42" "You should consider fixing this." }}
+```
+
+Produces this console log:
+
+```text
+WARN You should consider fixing this.
+You can suppress this warning by adding the following to your site configuration:
+ignoreLogs = ['warning-42']
+```
+
+To suppress this message:
+
+{{< code-toggle file=hugo >}}
+ignoreLogs = ["warning-42"]
+{{< /code-toggle >}}
+
+[`warnf`]: /functions/fmt/warnf/