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

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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/