hugo/docs/content/en/functions/fmt/Warnidf.md

---
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/