hugo/docs/content/en/functions/errorf.md

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---
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title: errorf and warnf
description: Log ERROR or WARNING from the templates.
date: 2017-09-30
publishdate: 2017-09-30
lastmod: 2017-09-30
categories: [functions]
menu:
docs:
parent: "functions"
keywords: [strings, log, error]
signature: ["errorf FORMAT INPUT"]
workson: []
hugoversion:
relatedfuncs: [printf]
deprecated: false
---
Squashed 'docs/' changes from 54f0e8776..bd0e15bb6 bd0e15bb6 Optimised images with calibre/image-actions 59830ea44 Remove comments from quickstart code samples 348821b5d Remove image-actions 1cbbd26a9 Update index.md bcf3de764 Update index.md fcf17e6ef Release 0.62.1 0956bde21 Merge branch 'temp621' 28d604756 releaser: Add release notes to /docs for release of 0.62.1 c895f12e7 Fix statement about version installed with apt-get (#854) e96928e38 Updated quickstart to split theme download and theme config add into separate blocks (#967) e099c1ad6 changed ".Title" to ".URL" (#972) bea71280d Fix small typing error (#1001) 9c28c422e Correct hyperlink for 'markdownify' function cf3844a06 Corrected small conjugation mistake (#996) 8b9c1d4f2 Added remarks about additional parameters in ref/relref (#995) ca06c9a56 Fix illegal character in render-link.html example 7a85c789b Update RenderString.md 69df3b17e Update configuration-markup.md 43e9222a2 Revert "Add shortcodes to note comparing with `markdownify`" 2bd5bc2d7 Add shortcodes to note comparing with `markdownify` ddfee60b7 Update configuration-markup.md f87c35fe2 docs: Remove extra double quotation 5ca5cc15f Update index.md 6e457f5ec Update configuration-markup.md 12df3c0fc Update configuration-markup.md 91977fd96 Update configuration-markup.md 377b8954a Update configuration-markup.md 99d691b5e Update hosting-on-render.md ccf855b22 Update index.md a945acc42 Update index.md 7d4f308d6 Fix Netlify config f4caa07f5 Release 0.62.0 79d18276f releaser: Add release notes to /docs for release of 0.62.0 9db1a08d1 Merge commit '8a4005cf2b0ef34265ff8051a6b76226685fc226' 79e556223 docs: More on hooks 5088c54df tpl: Do not return any value in errorf 98c8c8638 tpl: Add a warnf template func 4a9d76cea docs: Regen docshelper 626e53b55 Fix incorrect MIME type from image/jpg to image/jpeg f92f77c5d Preserve HTML Text for link render hooks 6db9c52b1 docs: Footnote 16801db3b Add render template hooks for links and images 0facb823c Merge commit '2e711a28c71e8667258e5ab824f9b9a71c261b0a' 79bf8ed4c markup/tableofcontents: Add config option for ordered list git-subtree-dir: docs git-subtree-split: bd0e15bb6063f7ad4f0c47eb33c8c0c23c962d13
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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).
Squashed 'docs/' changes from 54f0e8776..bd0e15bb6 bd0e15bb6 Optimised images with calibre/image-actions 59830ea44 Remove comments from quickstart code samples 348821b5d Remove image-actions 1cbbd26a9 Update index.md bcf3de764 Update index.md fcf17e6ef Release 0.62.1 0956bde21 Merge branch 'temp621' 28d604756 releaser: Add release notes to /docs for release of 0.62.1 c895f12e7 Fix statement about version installed with apt-get (#854) e96928e38 Updated quickstart to split theme download and theme config add into separate blocks (#967) e099c1ad6 changed ".Title" to ".URL" (#972) bea71280d Fix small typing error (#1001) 9c28c422e Correct hyperlink for 'markdownify' function cf3844a06 Corrected small conjugation mistake (#996) 8b9c1d4f2 Added remarks about additional parameters in ref/relref (#995) ca06c9a56 Fix illegal character in render-link.html example 7a85c789b Update RenderString.md 69df3b17e Update configuration-markup.md 43e9222a2 Revert "Add shortcodes to note comparing with `markdownify`" 2bd5bc2d7 Add shortcodes to note comparing with `markdownify` ddfee60b7 Update configuration-markup.md f87c35fe2 docs: Remove extra double quotation 5ca5cc15f Update index.md 6e457f5ec Update configuration-markup.md 12df3c0fc Update configuration-markup.md 91977fd96 Update configuration-markup.md 377b8954a Update configuration-markup.md 99d691b5e Update hosting-on-render.md ccf855b22 Update index.md a945acc42 Update index.md 7d4f308d6 Fix Netlify config f4caa07f5 Release 0.62.0 79d18276f releaser: Add release notes to /docs for release of 0.62.0 9db1a08d1 Merge commit '8a4005cf2b0ef34265ff8051a6b76226685fc226' 79e556223 docs: More on hooks 5088c54df tpl: Do not return any value in errorf 98c8c8638 tpl: Add a warnf template func 4a9d76cea docs: Regen docshelper 626e53b55 Fix incorrect MIME type from image/jpg to image/jpeg f92f77c5d Preserve HTML Text for link render hooks 6db9c52b1 docs: Footnote 16801db3b Add render template hooks for links and images 0facb823c Merge commit '2e711a28c71e8667258e5ab824f9b9a71c261b0a' 79bf8ed4c markup/tableofcontents: Add config option for ordered list git-subtree-dir: docs git-subtree-split: bd0e15bb6063f7ad4f0c47eb33c8c0c23c962d13
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Any ERROR will also cause the build to fail (the `hugo` command will `exit -1`).
Both functions return an empty string, so the messages are only printed to the console.
```
{{ errorf "Failed to handle page %q" .Path }}
```
Squashed 'docs/' changes from 54f0e8776..bd0e15bb6 bd0e15bb6 Optimised images with calibre/image-actions 59830ea44 Remove comments from quickstart code samples 348821b5d Remove image-actions 1cbbd26a9 Update index.md bcf3de764 Update index.md fcf17e6ef Release 0.62.1 0956bde21 Merge branch 'temp621' 28d604756 releaser: Add release notes to /docs for release of 0.62.1 c895f12e7 Fix statement about version installed with apt-get (#854) e96928e38 Updated quickstart to split theme download and theme config add into separate blocks (#967) e099c1ad6 changed ".Title" to ".URL" (#972) bea71280d Fix small typing error (#1001) 9c28c422e Correct hyperlink for 'markdownify' function cf3844a06 Corrected small conjugation mistake (#996) 8b9c1d4f2 Added remarks about additional parameters in ref/relref (#995) ca06c9a56 Fix illegal character in render-link.html example 7a85c789b Update RenderString.md 69df3b17e Update configuration-markup.md 43e9222a2 Revert "Add shortcodes to note comparing with `markdownify`" 2bd5bc2d7 Add shortcodes to note comparing with `markdownify` ddfee60b7 Update configuration-markup.md f87c35fe2 docs: Remove extra double quotation 5ca5cc15f Update index.md 6e457f5ec Update configuration-markup.md 12df3c0fc Update configuration-markup.md 91977fd96 Update configuration-markup.md 377b8954a Update configuration-markup.md 99d691b5e Update hosting-on-render.md ccf855b22 Update index.md a945acc42 Update index.md 7d4f308d6 Fix Netlify config f4caa07f5 Release 0.62.0 79d18276f releaser: Add release notes to /docs for release of 0.62.0 9db1a08d1 Merge commit '8a4005cf2b0ef34265ff8051a6b76226685fc226' 79e556223 docs: More on hooks 5088c54df tpl: Do not return any value in errorf 98c8c8638 tpl: Add a warnf template func 4a9d76cea docs: Regen docshelper 626e53b55 Fix incorrect MIME type from image/jpg to image/jpeg f92f77c5d Preserve HTML Text for link render hooks 6db9c52b1 docs: Footnote 16801db3b Add render template hooks for links and images 0facb823c Merge commit '2e711a28c71e8667258e5ab824f9b9a71c261b0a' 79bf8ed4c markup/tableofcontents: Add config option for ordered list git-subtree-dir: docs git-subtree-split: bd0e15bb6063f7ad4f0c47eb33c8c0c23c962d13
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```
{{ warnf "You should update the shortcodes in %q" .Path }}
```
Note that `errorf`, `erroridf`, and `warnf` support all the formatting verbs of the [fmt](https://golang.org/pkg/fmt/) package.
## Suppress errors
Sometimes it may make sense to let the user suppress an ERROR and make the build succeed.
You can do this by using the `erroridf` function. This functions takes an error ID as the first argument.
```
{{ erroridf "my-custom-error" "You should consider fixing this." }}
```
This will produce:
```
ERROR 2021/06/07 17:47:38 You should consider fixing this.
If you feel that this should not be logged as an ERROR, you can ignore it by adding this to your site config:
ignoreErrors = ["my-custom-error"]
```