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33 lines
916 B
Markdown
33 lines
916 B
Markdown
---
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title: errorf and warnf
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description: Log ERROR or WARNING from the templates.
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date: 2017-09-30
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publishdate: 2017-09-30
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lastmod: 2017-09-30
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [strings, log, error]
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signature: ["errorf FORMAT INPUT"]
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workson: []
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hugoversion:
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relatedfuncs: [printf]
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deprecated: false
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---
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`errorf` or `warnf` will evaluate a format string, then output the result to the ERROR or WARNING log (and only once per error message to avoid flooding the log).
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Any ERROR will also cause the build to fail (the `hugo` command will `exit -1`).
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Both functions return an empty string, so the messages are only printed to the console.
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```
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{{ errorf "Failed to handle page %q" .Path }}
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```
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```
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{{ warnf "You should update the shortcodes in %q" .Path }}
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```
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Note that `errorf` and `warnf` support all the formatting verbs of the [fmt](https://golang.org/pkg/fmt/) package.
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