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Notion includes rich text objects in block objects to indicate how blocks in a page are represented. Blocks that support rich text will include a rich text object; however, not all block types offer rich text. When blocks are retrieved from a page using the Retrieve a block or Retrieve block children endpoints, an array of rich text objects will be included in the block object (when available). Developers can use this array to retrieve the plain text (plain_text) for the block or get all the rich text styling and formatting options applied to the block. 
{
  "type": "text",
  "text": {
    "content": "Some words ",
    "link": null
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "Some words ",
  "href": null
}
Many block types support rich text. In cases where it is supported, a rich_text object will be included in the block type object. All rich_text objects will include a plain_text property, which provides a convenient way for developers to access unformatted text from the Notion block.
Each rich text object contains the following fields.
FieldTypeDescriptionExample value
typestring (enum)The type of this rich text object. Possible type values are: "text", "mention", "equation"."text"
text | mention | equationobjectAn object containing type-specific configuration.

Refer to the rich text type objects section below for details on type-specific values.		Refer to the rich text type objects section below for examples.
annotationsobjectThe information used to style the rich text object. Refer to the annotation object section below for details.Refer to the annotation object section below for examples.
plain_textstringThe plain text without annotations."Some words "
hrefstring (optional)The URL of any link or Notion mention in this text, if any."https://www.notion.so/Avocado-d093f1d200464ce78b36e58a3f0d8043"

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The annotation object

All rich text objects contain an annotations object that sets the styling for the rich text. annotations includes the following fields:
PropertyTypeDescriptionExample value
boldbooleanWhether the text is bolded.true
italicbooleanWhether the text is italicized.true
strikethroughbooleanWhether the text is struck through.false
underlinebooleanWhether the text is underlined.false
codebooleanWhether the text is code style.true
colorstring (enum)Color of the text. Possible values include:

- "blue"
- "blue_background"
- "brown"
- "brown_background"
- "default"
- "gray"
- "gray_background"
- "green"
- "green_background"
- "orange"
-"orange_background"
- "pink"
- "pink_background"
- "purple"
- "purple_background"
- "red"
- "red_background”
- "yellow"
- "yellow_background"		"green"

​
Rich text type objects

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Equation

Notion supports inline LaTeX equations as rich text object’s with a type value of "equation". The corresponding equation type object contains the following:
FieldTypeDescriptionExample value
expressionstringThe LaTeX string representing the inline equation."\frac{{ - b \pm \sqrt {b^2 - 4ac} }}{{2a}}"

​
Example rich text equation object

{
  "type": "equation",
  "equation": {
    "expression": "E = mc^2"
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "E = mc^2",
  "href": null
}

​
Mention

Mention objects represent an inline mention of a database, date, link preview mention, page, template mention, or user. A mention is created in the Notion UI when a user types @ followed by the name of the reference. If a rich text object’s type value is "mention", then the corresponding mention object contains the following:
FieldTypeDescriptionExample value
typestring (enum)The type of the inline mention. Possible values include:

- "database"
- "date"
- "link_preview"
- "page"
- "template_mention"
- "user"		"user"
database | date | link_preview | page | template_mention | userobjectAn object containing type-specific configuration. Refer to the mention type object sections below for details.Refer to the mention type object sections below for example values.

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Database mention type object

Database mentions contain a database reference within the corresponding database field. A database reference is an object with an id key and a string value (UUIDv4) corresponding to a database ID. If an integration doesn’t have access to the mentioned database, then the mention is returned with just the ID. The plain_text value that would be a title appears as "Untitled" and the annotation object’s values are defaults. Example rich text mention object for a database mention 
{
  "type": "mention",
  "mention": {
    "type": "database",
    "database": {
      "id": "a1d8501e-1ac1-43e9-a6bd-ea9fe6c8822b"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "Database with test things",
  "href": "https://www.notion.so/a1d8501e1ac143e9a6bdea9fe6c8822b"
}

​
Date mention type object

Date mentions contain a date property value object within the corresponding date field. Example rich text mention object for a date mention 
{
  "type": "mention",
  "mention": {
    "type": "date",
    "date": {
      "start": "2022-12-16",
      "end": null
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "2022-12-16",
  "href": null
}
If a user opts to share a Link Preview as a mention, then the API handles the Link Preview mention as a rich text object with a type value of link_preview. Link preview rich text mentions contain a corresponding link_preview object that includes the url that is used to create the Link Preview mention. Example rich text mention object for a link_preview mention 
{
  "type": "mention",
  "mention": {
    "type": "link_preview",
    "link_preview": {
      "url": "https://workspace.slack.com/archives/C04PF0F9QSD/z1671139297838409?thread_ts=1671139274.065079&cid=C03PF0F9QSD"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "https://workspace.slack.com/archives/C04PF0F9QSD/z1671139297838409?thread_ts=1671139274.065079&cid=C03PF0F9QSD",
  "href": "https://workspace.slack.com/archives/C04PF0F9QSD/z1671139297838409?thread_ts=1671139274.065079&cid=C03PF0F9QSD"
}

​
Page mention type object

Page mentions contain a page reference within the corresponding page field. A page reference is an object with an id property and a string value (UUIDv4) corresponding to a page ID. If an integration doesn’t have access to the mentioned page, then the mention is returned with just the ID. The plain_text value that would be a title appears as "Untitled" and the annotation object’s values are defaults. Example rich text mention object for a page mention 
{
  "type": "mention",
  "mention": {
    "type": "page",
    "page": {
      "id": "3c612f56-fdd0-4a30-a4d6-bda7d7426309"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "This is a test page",
  "href": "https://www.notion.so/3c612f56fdd04a30a4d6bda7d7426309"
}

​
Template mention type object

The content inside a template button in the Notion UI can include placeholder date and user mentions that populate when a template is duplicated. Template mention type objects contain these populated values. Template mention rich text objects contain a template_mention object with a nested type key that is either "template_mention_date" or "template_mention_user". If the type key is "template_mention_date", then the rich text object contains the following template_mention_date field:
FieldTypeDescriptionExample value
template_mention_datestring (enum)The type of the date mention. Possible values include: "today" and "now"."today"
Example rich text mention object for a template_mention_date mention 
{
  "type": "mention",
  "mention": {
    "type": "template_mention",
    "template_mention": {
      "type": "template_mention_date",
      "template_mention_date": "today"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "@Today",
  "href": null
}
If the type key is "template_mention_user", then the rich text object contains the following template_mention_user field:
FieldTypeDescriptionExample value
template_mention_userstring (enum)The type of the user mention. The only possible value is "me"."me"
Example rich text mention object for a template_mention_user mention 
{
  "type": "mention",
  "mention": {
    "type": "template_mention",
    "template_mention": {
      "type": "template_mention_user",
      "template_mention_user": "me"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "@Me",
  "href": null
}

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User mention type object

If a rich text object’s type value is "user", then the corresponding user field contains a user object.
If your integration doesn’t yet have access to the mentioned user, then the plain_text that would include a user’s name reads as "@Anonymous". To update the integration to get access to the user, update the integration capabilities on the integration settings page.
Example rich text mention object for a user mention 
{
  "type": "mention",
  "mention": {
    "type": "user",
    "user": {
      "object": "user",
      "id": "b2e19928-b427-4aad-9a9d-fde65479b1d9"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "@Anonymous",
  "href": null
}

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Text

If a rich text object’s type value is "text", then the corresponding text field contains an object including the following:
FieldTypeDescriptionExample value
contentstringThe actual text content of the text."Some words "
linkobject (optional)An object with information about any inline link in this text, if included.

If the text contains an inline link, then the object key is url and the value is the URL’s string web address.

If the text doesn’t have any inline links, then the value is null.		{ "url": "https://developers.notion.com/" }

​
Example rich text text object without link

{
  "type": "text",
  "text": {
    "content": "This is an ",
    "link": null
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "This is an ",
  "href": null
}

​
Example rich text text object with link

{
  "type": "text",
  "text": {
    "content": "inline link",
    "link": {
      "url": "https://developers.notion.com/"
    }
  },
  "annotations": {
    "bold": false,
    "italic": false,
    "strikethrough": false,
    "underline": false,
    "code": false,
    "color": "default"
  },
  "plain_text": "inline link",
  "href": "https://developers.notion.com/"
}
Rich text object limitsRefer to the request limits documentation page for information about limits on the size of rich text objects.