Properties And Constraints

This page lists the properties and limits which are applicable to various CometChat systems.

Chat widgets: Properties and Constraints

Item	Property or Constraint	Notes
Number of Widgets that can be created for an app	Maximum 25
Widget name	UTF8mb4, 100 chars, No new line characters
Widget version	v2	Cannot be set programatically
Docked layout icon	Docked layout icon: PNG,JPG,GIF,SVG

Webhooks: Properties and Constraints

Item	Property or Constraint	Notes
Maximum number of webhooks in an app	Maximum 25
Webhook URL	Valid URL, maximum 255 characters
Webhook ID	50 characters, UTF8mb4 set, alphanumeric (without spaces)
Webhook authentication username	50 characters, alphanumeric (without spaces)
Webhook authentication password	100 characters, alphanumeric (without spaces)

Management APIs: Properties and Constraints

Item	Property or Constraint	Notes
App length	100 characters, UTF8mb4 set
App version	v3	This is the only option available
Number of Collaborators that can be created (team management)	Maximum 25

REST APIs: Properties and Constraints

Also see REST API documentation for further information on properties and constraints for each endpoint.

Item	Property or Constraint	Notes
Number of Bot users that can be created	Maximum 25
API Keys	100 characters (UTF8mb4 Characters)	This covers all the languages and even emojis. (One emoji uses two characters).
Number of APIs keys that can be created for an app	Maximum 25

Users and Groups: Properties and Constraints

Item	Property or Constraint	Notes
Character limits for UIDs and GUIDs	100 characters
Maximum users in a group (v3)	100000
Maximum groups a user can be a part of	No limits
Maximum number of friends for a user	No limits
Maximum tokens for a user	No limits
Maximum number of groups	No limits
Maximum number of unread messages per user	No limits
Maximum number of users that can be created for an app	No limits
User and Group ID	100 characters, alpha-dash (a-z, 0-9 with -and _) without spaces .	CometChat forces the UID to all lowercase.
User and Group name	100 characters, UTF8mb4 set	This covers all the languages and even emojis.
User and Group avatar	Must be a URL, limit of 3000 characters	CometChat doesn’t save the image on its servers.. There is no limit on the image resolution. It depends on the implementation.
User profile	Must be a URL, limit of 3000 characters	Same as above
User and Group metadata	The API limit for the POST request length is 10 KB. Hence, the user’s metadata information must fit in the same limit and must not exceed 1.6 KB.
User and Group tag	A user can have up to 25 tags with 100 characters per tag. The tags can be in any language. The character set must be UTF8mb4
Group password	String up to 100 characters
Group description	255 characters, UTF8mb4 set
Maximum active presence subscriptions	The presence subscription will be active until 1000 users are online for a single app. if more than 1000 users go online, the presence notification starting from the 1001st user will not be sent to other users.	Note, this is the higher limit applicable across subscription for friends, users with certain roles and all users
Typing indicators for groups	Typing indicator will be sent for a group of up to 1000 online users.
Unread message counts for groups	For a group with more than 300 members, the conversations and unread message counts are not updated.
Delivery and read receipts for groups	Delivery and read receipts will be sent for for a group of up to 300 online users.

Roles: Properties and Constraints

Item	Property or Constraint	Notes
Maximum number of Roles that can be created	Maximum 25
Role UID	100 characters, alpha-dash (a-z, 0-9 with -and _) without spaces	CometChat forces the UID to lowercase.
Role name	100 characters, UTF8mb4	This covers all the languages and even emojis.
Role description	255 characters, UTF8mb4 set, any language.
Metadata	No limit

Messages: Properties and Constraints

Item	Property or Constraint	Notes
Maximum file attachment size	100 MB per message	(Includes not just the file size but entire POST body (including chat text and custom data)
Message data (Applicable for API calls)	Data is an arbitrary JSON structure. It accepts utf8mb4. It can have any user defined properties. but the below properties have meaning for CometChat: text, attachments, custome_data, metadata. Note: The attachment size is separate. Here, the attachment is only the attachment properties (such as URL, size, etc.). The size must not exceed 10KB for the data object.
Message tags	A message can have up to 25 tags with 100 characters per tag. The tags can be in any language. The character set must be UTF8mb4.
User and Group conversation tags	A conversation can have up to 25 tags with 100 characters per tag. The tags can be in any language. The character set must be UTF8mb4.
Does CometChat keep soft deleted messages in its database?	Yes
Does CometChat keep permanently deleted messages (by API) in its database?	No

Calling: Properties and Constraints

Item	Property or Constraint	Notes
Maximum users in a call	50
Default frame rate for video calls	30 FPS
Resolution for video calls	Maximum - 720p, Minimum - 180p	This depends on the layout selected and the bandwidth available at the user’s end
Media encryption used	SRTP
Audio codec used	OPUS
Video codec used	H.264