Text object
Defines text for blocks and elements, either as plain text or formatted with mrkdwn.
Each block or element sets its own length limit and says whether it accepts mrkdwn (a header, for example, only takes plain_text).
mrkdwn supports:
*bold*,_italic_,~strike~,`inline code`and```code blocks```>at the start of a line for a block quote, and\nfor a line break- links:
<https://example.com|label>and<mailto:[email protected]|Email sales> - mentions:
<@USER_ID>,<#CHANNEL_ID>,<!subteam^DEPARTMENT_ID>, and<!here>,<!channel>,<!everyone> - dates:
<!date^1791813600^{date_short} at {time}|Oct 12, 2026 2:00 PM UTC>, shown in the reader’s language and timezone - emoji shortcodes such as
:white_check_mark:
Write a literal &, < or > as &, < and >.
Date tokens: {date_num} (2026-10-12), {date} (October 12, 2026), {date_short} (Oct 12, 2026), {date_long} (Monday, October 12, 2026), {date_pretty}, {date_short_pretty} and {date_long_pretty} (the same, or today / yesterday / tomorrow), {day_divider_pretty}, {time}, {time_secs} and {ago} (3 minutes ago).
Fields
Section titled “Fields”| Field | Type | Description | Required? |
|---|---|---|---|
type |
String | The formatting to use for this text object. Can be one of plain_text or mrkdwn. |
Required |
text |
String | The text. Accepts mrkdwn formatting when type is mrkdwn. The minimum length is 1 and the maximum length is 3000 characters; the block or element holding it may set a lower limit. |
Required |
emoji |
Boolean | Whether emoji shortcodes such as :tada: are shown as emoji. Defaults to true. Only usable when type is plain_text. |
Optional |
verbatim |
Boolean | When false (the default on Slack), URLs, conversation names and certain mentions are parsed automatically. When true, only explicit mrkdwn syntax is processed. Only usable when type is mrkdwn. |
Optional |
Examples
Section titled “Examples”Plain text and mrkdwn
Section titled “Plain text and mrkdwn”
{ "blocks": [ { "type": "header", "text": { "type": "plain_text", "text": "Deal won :tada:", "emoji": true } }, { "type": "section", "text": { "type": "mrkdwn", "text": "*Cedar Retail Group* signed the 3-year CRM contract.\nOwner: <@3f6c2a1e-8b4d-4c7a-9e21-5d0b7f9a1c34|Account owner> · <https://example.com/deals/cedar|Open the deal>\nSigned <!date^1791813600^{date_short_pretty} at {time}|Oct 12, 2026 2:00 PM UTC>" } } ]}Quotes, code and mentions
Section titled “Quotes, code and mentions”
{ "blocks": [ { "type": "section", "text": { "type": "mrkdwn", "text": "<!subteam^c2b8e5f1-4a6d-4e9b-8f73-1d5a0c6e9b28|@Customer Success> please review the escalation in <#a7d41c90-2e5b-4f83-b6c1-0e9f2d84a517|support-escalations>.\n>The customer reports error `E-401` when syncing invoices.\n~Waiting on engineering~ Fix deployed _this morning_." } } ]}