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---
layout: default
+title: Configuration
+nav_order: 2
+---
+
+# Configuration
+{: .no_toc }
+
+Just the Docs has some specific configuration parameters that can be defined in your Jekyll site's \_config.yml file.
+{: .fs-6 .fw-300 }
+
+## Table of contents
+{: .no_toc .text-delta }
+
+1. TOC
+{:toc}
+
+---
+
+View this site's [\_config.yml](https://github.com/just-the-docs/just-the-docs/tree/main/_config.yml) file as an example.
+
+## Site logo
+
+```yaml
+# Set a path/url to a logo that will be displayed instead of the title
+logo: "/assets/images/just-the-docs.png"
+```
+
+## Site favicon
+
+```yaml
+# Set a path/url to a favicon that will be displayed by the browser
+favicon_ico: "/assets/images/favicon.ico"
+```
+
+If the path to your favicon is `/favicon.ico`, you can leave `favicon_ico` unset.
+
+## Search
+
+```yaml
+# Enable or disable the site search
+# Supports true (default) or false
+search_enabled: true
+
+search:
+ # Split pages into sections that can be searched individually
+ # Supports 1 - 6, default: 2
+ heading_level: 2
+ # Maximum amount of previews per search result
+ # Default: 3
+ previews: 3
+ # Maximum amount of words to display before a matched word in the preview
+ # Default: 5
+ preview_words_before: 5
+ # Maximum amount of words to display after a matched word in the preview
+ # Default: 10
+ preview_words_after: 10
+ # Set the search token separator
+ # Default: /[\s\-/]+/
+ # Example: enable support for hyphenated search words
+ tokenizer_separator: /[\s/]+/
+ # Display the relative url in search results
+ # Supports true (default) or false
+ rel_url: true
+ # Enable or disable the search button that appears in the bottom right corner of every page
+ # Supports true or false (default)
+ button: false
+```
+
+## Mermaid Diagrams
+{: .d-inline-block }
+
+New (v0.4.0)
+{: .label .label-green }
+
+The minimum configuration requires the key for `version` ([from jsDelivr](https://cdn.jsdelivr.net/npm/mermaid/)) in `_config.yml`:
+
+```yaml
+mermaid:
+ # Version of mermaid library
+ # Pick an available version from https://cdn.jsdelivr.net/npm/mermaid/
+ version: "9.1.3"
+```
+
+Provide a `path` instead of a `version` key to load the mermaid library from a local file.
+
+See [the Code documentation]({% link docs/ui-components/code.md %}#mermaid-diagram-code-blocks) for more configuration options and information.
+
+## Aux links
+
+```yaml
+# Aux links for the upper right navigation
+aux_links:
+ "Just the Docs on GitHub":
+ - "//github.com/just-the-docs/just-the-docs"
+
+# Makes Aux links open in a new tab. Default is false
+aux_links_new_tab: false
+```
+
+## Heading anchor links
+
+```yaml
+# Heading anchor links appear on hover over h1-h6 tags in page content
+# allowing users to deep link to a particular heading on a page.
+#
+# Supports true (default) or false
+heading_anchors: true
+```
+
+## External navigation links
+{: .d-inline-block }
+
+New (v0.4.0)
+{: .label .label-green }
+
+External links can be added to the navigation through the `nav_external_links` option.
+See [Navigation Structure]({% link docs/navigation-structure.md %}#external-navigation-links) for more details.
+
+## Footer content
+
+```yaml
+# Footer content
+# appears at the bottom of every page's main content
+# Note: The footer_content option is deprecated and will be removed in a future major release. Please use `_includes/footer_custom.html` for more robust
+markup / liquid-based content.
+footer_content: "Copyright © 2017-2020 Patrick Marsceill. Distributed by an MIT license."
+
+# Footer last edited timestamp
+last_edit_timestamp: true # show or hide edit time - page must have `last_modified_date` defined in the frontmatter
+last_edit_time_format: "%b %e %Y at %I:%M %p" # uses ruby's time format: https://ruby-doc.org/stdlib-2.7.0/libdoc/time/rdoc/Time.html
+
+# Footer "Edit this page on GitHub" link text
+gh_edit_link: true # show or hide edit this page link
+gh_edit_link_text: "Edit this page on GitHub."
+gh_edit_repository: "https://github.com/just-the-docs/just-the-docs" # the github URL for your repo
+gh_edit_branch: "main" # the branch that your docs is served from
+# gh_edit_source: docs # the source that your files originate from
+gh_edit_view_mode: "tree" # "tree" or "edit" if you want the user to jump into the editor immediately
+```
+
+_note: `footer_content` is deprecated, but still supported. For a better experience we have moved this into an include called `_includes/footer_custom.html` which will allow for robust markup / liquid-based content._
+
+- the "page last modified" data will only display if a page has a key called `last_modified_date`, formatted in some readable date format
+- `last_edit_time_format` uses Ruby's DateTime formatter; see examples and more information [at this link.](https://apidock.com/ruby/DateTime/strftime)
+- `gh_edit_repository` is the URL of the project's GitHub repository
+- `gh_edit_branch` is the branch that the docs site is served from; defaults to `main`
+- `gh_edit_source` is the source directory that your project files are stored in (should be the same as [site.source](https://jekyllrb.com/docs/configuration/options/))
+- `gh_edit_view_mode` is `"tree"` by default, which brings the user to the github page; switch to `"edit"` to bring the user directly into editing mode
+
+## Color scheme
+
+```yaml
+# Color scheme supports "light" (default) and "dark"
+color_scheme: dark
+```
+
+
+
+
+
+See [Customization]({% link docs/customization.md %}) for more information.
+
+## Callouts
+{: .d-inline-block }
+
+New (v0.4.0)
+{: .label .label-green }
+
+To use this feature, you need to configure a `color` and (optionally) `title` for each kind of callout you want to use, e.g.:
+
+```yaml
+callouts:
+ warning:
+ title: Warning
+ color: red
+```
+
+This uses the color `$red-000` for the background of the callout, and `$red-300` for the title and box decoration.[^dark] You can then style a paragraph as a `warning` callout like this:
+
+```markdown
+{: .warning }
+A paragraph...
+```
+
+[^dark]:
+ If you use the `dark` color scheme, this callout uses `$red-300` for the background, and `$red-000` for the title.
+
+The colors `grey-lt`, `grey-dk`, `purple`, `blue`, `green`, `yellow`, and `red` are predefined; to use a custom color, you need to define its `000` and `300` levels in your SCSS files. For example, to use `pink`, add the following to your `_sass/custom/setup.scss` file:
+
+```scss
+$pink-000: #f77ef1;
+$pink-100: #f967f1;
+$pink-200: #e94ee1;
+$pink-300: #dd2cd4;
+```
+
+You can override the default `opacity` of the background for a particular callout, e.g.:
+
+```yaml
+callouts:
+ custom:
+ color: pink
+ opacity: 0.3
+```
+
+You can change the default opacity (`0.2`) for all callouts, e.g.:
+
+```yaml
+callouts_opacity: 0.3
+```
+
+You can also adjust the overall level of callouts.
+The value of `callouts_level` is either `quiet` or `loud`;
+`loud` increases the saturation and lightness of the backgrounds.
+The default level is `quiet` when using the `light` or custom color schemes,
+and `loud` when using the `dark color scheme.`
+
+See [Callouts]({% link docs/ui-components/callouts.md %}) for more information.
+
+## Google Analytics
+
+{: .warning }
+> [Google Analytics 4 will replace Universal Analytics](https://support.google.com/analytics/answer/11583528). On **July 1, 2023**, standard Universal Analytics properties will stop processing new hits. The earlier you migrate, the more historical data and insights you will have in Google Analytics 4.
+
+Universal Analytics (UA) and Google Analytics 4 (GA4) properties are supported.
+
+```yaml
+# Google Analytics Tracking (optional)
+# Supports a CSV of tracking ID strings (eg. "UA-1234567-89,G-1AB234CDE5")
+ga_tracking: UA-2709176-10
+ga_tracking_anonymize_ip: true # Use GDPR compliant Google Analytics settings (true/nil by default)
+```
+
+### Multiple IDs
+{: .d-inline-block .no_toc }
+
+New (v0.4.0)
+{: .label .label-green }
+
+This theme supports multiple comma-separated tracking IDs. This helps seamlessly transition UA properties to GA4 properties by tracking both for a while.
+
+```yaml
+ga_tracking: "UA-1234567-89,G-1AB234CDE5"
+```
+
+## Document collections
+
+By default, the navigation and search include normal [pages](https://jekyllrb.com/docs/pages/).
+You can also use [Jekyll collections](https://jekyllrb.com/docs/collections/) which group documents semantically together.
+
+{: .warning }
+> Collection folders always start with an underscore (`_`), e.g. `_tests`. You won't see your collections if you omit the prefix.
+
+For example, put all your test files in the `_tests` folder and create the `tests` collection:
+
+```yaml
+# Define Jekyll collections
+collections:
+ # Define a collection named "tests", its documents reside in the "_tests" directory
+ tests:
+ permalink: "/:collection/:path/"
+ output: true
+
+just_the_docs:
+ # Define which collections are used in just-the-docs
+ collections:
+ # Reference the "tests" collection
+ tests:
+ # Give the collection a name
+ name: Tests
+ # Exclude the collection from the navigation
+ # Supports true or false (default)
+ # nav_exclude: true
+ # Fold the collection in the navigation
+ # Supports true or false (default)
+ # nav_fold: true # note: this option is new in v0.4
+ # Exclude the collection from the search
+ # Supports true or false (default)
+ # search_exclude: true
+```
+
+The navigation for all your normal pages (if any) is displayed before those in collections.
+
+New (v0.4.0){: .label .label-green }
+Including `nav_fold: true` in a collection configuration *folds* that collection:
+an expander symbol appears next to the collection name,
+and clicking it displays/hides the links to the top-level pages of the collection.[^js-disabled]
+
+[^js-disabled]: New (v0.6.0){: .label .label-green }
+ When JavaScript is disabled in the browser, all folded collections are automatically expanded,
+ since clicking expander symbols has no effect.
+ (In previous releases, navigation into folded collections required JavaScript to be enabled.)
+
+You can reference multiple collections.
+This creates categories in the navigation with the configured names.
+
+```yaml
+collections:
+ tests:
+ permalink: "/:collection/:path/"
+ output: true
+ tutorials:
+ permalink: "/:collection/:path/"
+ output: true
+
+just_the_docs:
+ collections:
+ tests:
+ name: Tests
+ tutorials:
+ name: Tutorials
+```
+
+When *all* your pages are in a single collection, its name is not displayed.
+
+The navigation for each collection is a separate name space for page titles: a page in one collection cannot be a child of a page in a different collection, or of a normal page.
+