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API changelog

This page documents changes to the Zulip Server API over time. See also the Zulip release lifecycle for background on why this API changelog is important, and the Zulip server changelog.

The API feature levels system used in this changelog is designed to make it possible to write API clients, such as the Zulip mobile and terminal apps, that work with a wide range of Zulip server versions. Every change to the Zulip API is recorded both here and in Changes entries in the API documentation for the modified endpoint(s).

When using an API endpoint whose behavior has changed, Zulip API clients should check the zulip_feature_level field, present in the GET /server_settings and POST /register responses, to determine the API format used by the Zulip server that they are interacting with.

Changes in Zulip 5.0

Feature level 111

Feature level 110

  • POST /register: Added server_web_public_streams_enabled to the response.

Feature level 109

Feature level 108

  • In the mobile application authentication flow, the authenticated user's user_id is now included in the parameters encoded in the final zulip:// redirect URL.

Feature level 107

Feature level 106

Feature level 105

Feature level 104

  • [PATCH /realm]: Added string_id parameter for changing an organization's subdomain. Currently, this is only allowed for changing changing a demo organization to a normal one.

Feature level 103

  • POST /register: Added create_web_public_stream_policy policy for which users can create web public streams.
  • [PATCH /realm]: Added support for updating create_web_public_stream_policy.
  • POST /register: Added can_create_web_public_streams boolean field to the response.

Feature level 102

  • POST /register, PATCH /realm: The create_stream_policy setting was split into two settings for different types of streams: create_private_stream_policy and create_public_stream_policy.
  • POST /register: The create_stream_policy property was deprecated in favor of the create_private_stream_policy and create_public_stream_policy properties, but it still available for backwards-compatibility.

Feature level 101

  • POST /register, PATCH /realm: Replaced the allow_message_deleting boolean field with an integer field delete_own_message_policy defining which roles can delete messages they had sent.

Feature level 100

  • POST /register, GET /events: message_content_delete_limit_seconds now represents no limit using null, instead of the integer 0, and 0 is no longer a possible value with any meaning.
  • PATCH /realm: One now sets message_content_delete_limit_seconds to no limit by passing the string unlimited, rather than the integer 0.

Feature level 99

  • PATCH /realm/user_settings_defaults, PATCH /realm: The default_twenty_four_hour_time parameter to PATCH /realm has been replaced by the twenty_four_hour_time parameter to PATCH /realm/user_settings_defaults, to match the new model for user preference defaults settings.

  • POST /register: Removed realm_default_twenty_four_hour_time from the response object. This value is now available in the twenty_four_hour_time field of the realm_user_settings_default object.

Feature level 98

  • POST /subscribe: Added is_web_public parameter for requesting the creation of a web-public stream.
  • PATCH /streams/{stream_id}: Added is_web_public parameter for converting a stream into a web-public stream.

Feature level 97

  • GET /realm/emoji, POST /realm/emoji/{emoji_name}, GET /events, POST /register: Custom emoji objects may now contain a still_url field, with the URL of a PNG still image version of the emoji. This field will only be present for animated emoji.

Feature level 96

Feature level 95

  • POST /register: Added realm_user_settings_defaults object, containing default values of personal user settings for new users in the realm.

  • GET /events: Added realm_user_settings_defaults event type, which is sent when the organization's configured default settings for new users change.

Feature level 94

  • POST /register: Added demo_organization_scheduled_deletion_date field to realm data.

Feature level 93

Feature level 92

Feature level 91

  • PATCH /realm, PATCH /streams/{stream_id}: These endpoints now accept "unlimited" for message_retention_days, replacing "forever" as the way to encode a retention policy where messages are not automatically deleted.

Feature level 90

  • POST /register: The unread_msgs section of the response no longer includes sender_ids in the streams dictionaries. These were removed because no clients were interested in using the data, which required substantial complexity to construct correctly.

Feature level 89

  • GET /events: Introduced the user_settings event type, unifying and replacing the previous update_display_settings and update_global_notifications event types. The legacy event types are still supported for backwards compatibility, but will be removed in a future release.
  • POST /register: Added user_settings field in the response, which is a dictionary containing all the user's personal settings. For backwards-compatibility, individual settings will still appear in the top-level response for clients don't support the user_settings_object client capability.
  • POST /register: Added the user_settings_object property to supported client_capabilities. When enabled, the server will not include a duplicate copy of personal settings in the top-level response.
  • GET /events: update_display_settings and update_global_notifications events now only sent to clients that did not include user_settings_object in their client_capabilities when the event queue was created.

Feature level 88

  • POST /register: Added zulip_merge_base field to the response.
  • GET /events: Added new zulip_merge_base field to the restart event.
  • GET /server_settings: Added zulip_merge_base to the responses which can be used to make "About Zulip" widgets in clients.

Feature level 87

  • PATCH /settings: Added a new enable_drafts_synchronization setting, which controls whether the syncing drafts between different clients is enabled.

  • GET /events, POST /register: Added new enable_drafts_synchronization setting under update_display_settings.

  • GET /drafts: Added new endpoint to fetch user's synced drafts from the server.

  • POST /drafts: Added new endpoint to create drafts when syncing has been enabled.

  • PATCH /drafts/{draft_id}: Added new endpoint to edit a draft already owned by the user.

  • DELETE /drafts/{draft_id}: Added new endpoint to delete a draft already owned by the user.

Feature level 86

  • GET /events: Added emoji_name, emoji_code, and reaction_type fields to user_status objects.
  • POST /register: Added emoji_name, emoji_code, and reaction_type fields to user_status objects.
  • POST /users/me/status: Added support for new emoji_name, emoji_code, and reaction_type parameters.

Feature level 85

  • POST /register, PATCH /realm: Replaced add_emoji_by_admins_only field with an integer field add_custom_emoji_policy.

Feature level 84

  • POST /register: The enter_sends setting is now sent when update_display_setting is present in fetch_event_types instead of realm_user.

Feature level 83

    • POST /register: The cross_realm_bots section of the response now uses the is_system_bot flag to indicate whether the bot is a system bot.

Feature level 82

  • PATCH /settings now accepts a new email_notifications_batching_period_seconds field for setting the time duration for which the server will collect email notifications before sending them.

Feature level 81

  • POST /users/me/enter-sends has been removed. The enter_sends setting is now edited using the normal PATCH /settings endpoint.

Feature level 80

  • PATCH /settings: The /settings/notifications and /settings/display endpoints were merged into the main /settings endpoint; now all personal settings should be edited using that single endpoint. The old URLs are preserved as deprecated aliases for backwards compatibility.

Feature level 79

  • GET /users/me/subscriptions: The subscribers field now returns user IDs if include_subscribers is passed. Previously, this endpoint returned user display email addresses in this field.
  • GET /streams/{stream_id}/members: This endpoint now returns user IDs. Previously, it returned display email addresses.

Feature level 78

  • PATCH /settings: Added ignored_parameters_unsupported field, which is a list of parameters that were ignored by the endpoint, to the response object.

  • PATCH /settings: Removed full_name and account_email fields from the response object.

Feature level 77

  • GET /events: Removed recipient_id and sender_id field in responses of delete_message event when message_type is private.

Feature level 76

  • POST /fetch_api_key, POST /dev_fetch_api_key: The HTTP status for authentication errors is now 401. This was previously 403.
  • All API endpoints now use the HTTP 401 error status for API requests involving a deactivated user or realm. This was previously 403.
  • Mobile push notifications now include the mentioned_user_group_id and mentioned_user_group_name fields when a user group containing the user is mentioned. Previously, these were indistinguishable from personal mentions (as both types have trigger="mention").

Feature level 75

  • POST /register, PATCH /realm: Replaced allow_community_topic_editing field with an integer field edit_topic_policy.

Feature level 74

  • POST /register: Added server_needs_upgrade and event_queue_longpoll_timeout_seconds field when fetching realm data.

Feature level 73

Feature level 72

  • POST /register: Renamed max_icon_file_size to max_icon_file_size_mib, realm_upload_quota to realm_upload_quota_mib and max_logo_file_size to max_logo_file_size_mib.

Feature level 71

  • GET /events: Added is_web_public field to stream events changing invite_only.

Feature level 70

  • POST /register: Added new top-level server_timestamp field when fetching presence data, to match the existing presence API.

Feature levels 66-69 are reserved for future use in 4.x maintenance releases.

Changes in Zulip 4.0

Feature level 65

No changes; feature level used for Zulip 4.0 release.

Feature level 64

  • PATCH /streams/{stream_id}: Removed unnecessary JSON-encoding of string parameters new_name and description.
  • PATCH /settings/display: Removed unnecessary JSON-encoding of string parameters default_view, emojiset and timezone.

Feature level 63

  • PATCH /settings/notifications: Removed unnecessary JSON-encoding of string parameter notification_sound.
  • PATCH /settings/display: Removed unnecessary JSON-encoding of string parameter default_language.
  • POST /users/me/tutorial_status: Removed unnecessary JSON-encoding of string parameter status.
  • POST /realm/domains: Removed unnecessary JSON-encoding of string parameter domain.
  • PATCH /default_stream_groups/{user_id}: Removed unnecessary JSON-encoding of string parameters new_group_name and new_description.
  • POST /users/me/hotspots: Removed unnecessary JSON-encoding of string parameter hotspot.

Feature level 62

  • Added moderators only option for wildcard_mention_policy.

Feature level 61

  • Added support for inviting users as moderators to the invitation endpoints.

Feature level 60

  • POST /register: Added a new boolean field is_moderator, similar to the existing is_admin, is_owner and is_guest fields, to the response.
  • PATCH /users/{user_id}: Added support for changing a user's organization-level role to moderator.
  • API endpoints that return role values can now return 300, the encoding of the moderator role.

Feature level 59

Feature level 58

  • POST /register: Added the new stream_typing_notifications property to supported client_capabilities.
  • GET /events: Extended format for typing events to support typing notifications in stream messages. These new events are only sent to clients with client_capabilities showing support for stream_typing_notifications.
  • POST /set-typing-status: Added support for sending typing notifications for stream messages.

Feature level 57

Feature level 56

  • POST /register: Added a new setting move_messages_between_streams_policy for controlling who can move messages between streams.

Feature level 55

  • POST /register: Added realm_giphy_rating and giphy_rating_options fields.
  • PATCH /realm: Added giphy_rating parameter.

Feature level 54

  • GET /realm/filters has been removed and replace with GET /realm/linkifiers which returns the data in a cleaner dictionary format.
  • GET /events: Introduced new event type realm_linkifiers. The previous realm_filters event type is still supported for backwards compatibility, but will be removed in a future release.
  • POST /register: The response now supports a realm_linkifiers event type, containing the same data as the legacy realm_filters key, with a more extensible object format. The previous realm_filters event type is still supported for backwards compatibility, but will be removed in a future release. The legacy realm_filters key is deprecated but remains available for backwards compatibility.

Feature level 53

  • POST /register: Added max_topic_length and max_message_length, and renamed max_stream_name_length and max_stream_description_length to allow clients to transparently support these values changing in a future server version.

Feature level 52

  • PATCH /realm: Removed unnecessary JSON-encoding of string parameters name, description, default_language, and default_code_block_language.

Feature level 51

  • POST /register: Added a new boolean field can_invite_others_to_realm.

Feature level 50

  • POST /register: Replaced invite_by_admins_only field with an integer field invite_to_realm_policy.

Feature level 49

Feature level 48

Feature level 47

  • POST /register: Added a new giphy_api_key field, which is required to fetch GIFs using the GIPHY API.

Feature level 46

  • GET /messages and GET /events: The topic_links field now contains a list of dictionaries, rather than a list of strings.

Feature level 45

  • GET /events: Removed useless op field from custom_profile_fields events. These events contain the full set of configured custom_profile_fields for the organization regardless of what triggered the change.

Feature level 44

  • POST /register: extended the unread_msgs object to include old_unreads_missing, which indicates whether the server truncated the unread_msgs due to excessive total unread messages.

Feature level 43

  • [GET /users/{user_id_or_email}/presence]: Added support for passing the user_id to identify the target user.

Feature level 42

  • PATCH /settings/display: Added a new default_view setting allowing the user to set the default view.

Feature level 41

  • GET /events: Removed name field from update subscription events.

Feature level 40

  • GET /events: Removed email field from update subscription events.

Feature level 39

Feature level 38

  • POST /register: Increased realm_community_topic_editing_limit_seconds time limit value to 259200s (3 days).

Feature level 37

  • Consistently provide subscribers in stream data when clients register for subscriptions with include_subscribers, even if the user can't access subscribers.

Feature level 36

  • POST /users: Restricted access to organization administrators with the can_create_users permission.
  • Error handling: The code property will not be present in errors due to rate limits.

Feature level 35

  • The peer_add and peer_remove subscription events now have plural versions of user_ids and stream_ids.

Feature level 34

  • POST /register: Added a new wildcard_mention_policy setting for controlling who can use wildcard mentions in large streams.

Feature level 33

  • Markdown code blocks now have a data-code-language attribute attached to the outer div element, recording the programming language that was selecting for syntax highlighting. This field supports the upcoming "view in playground" feature for code blocks.

Feature level 32

  • GET /events: Added op field to update_message_flags events, deprecating the operation field (which has the same value). This removes an unintentional anomaly in the format of this event type.

Feature level 31

  • GET users/me/subscriptions: Added a role field to Subscription objects representing whether the user is a stream administrator.

  • GET /events: Added role field to Subscription objects sent in subscriptions events.

Note that as of this feature level, stream administrators are a partially completed feature. In particular, it is impossible for a user to be a stream administrator at this feature level.

Feature level 30

Feature levels 28 and 29 are reserved for future use in 3.x bug fix releases.

Changes in Zulip 3.1

Feature level 27

  • The short_name field is removed from display_recipients in POST /users.

Feature level 26

  • The sender_short_name field is no longer included in GET /messages.
  • The short_name field is removed from display_recipients in GET /messages.

Changes in Zulip 3.0

Feature level 25

No changes; feature level used for Zulip 3.0 release.

Feature level 24

  • The !avatar() and !gravatar() Markdown syntax, which was never documented, had inconsistent syntax, and was rarely used, was removed.

Feature level 23

  • GET/PUT/POST /users/me/pointer: Removed. Zulip 3.0 removes the pointer concept from Zulip; this legacy data structure was replaced by tracking unread messages and loading views centered on the first unread message.

Feature level 22

  • GET /attachments: The date when a message using the attachment was sent is now correctly encoded as date_sent, replacing the confusingly named name field. The date_sent and create_time fields of attachment objects are now encoded as integers; (previously the implementation could send floats incorrectly suggesting that microsecond precision is relevant).
  • GET /invites: Now encodes the user ID of the person who created the invitation as invited_by_user_id, replacing the previous ref field (which had that user's Zulip display email address).
  • POST /register: The encoding of an unlimited realm_message_retention_days in the response was changed from null to -1.

Feature level 21

  • PATCH /settings/display: Replaced the night_mode boolean with color_scheme as part of supporting automatic night theme detection.

Feature level 20

  • Added support for inviting users as organization owners to the invitation endpoints.

Feature level 19

  • GET /events: subscriptions event with op="peer_add" and op="peer_remove" now identify the modified stream by a stream_id field, replacing the old name field.

Feature level 18

  • POST /register: Added user_avatar_url_field_optional to supported client_capabilities.

Feature level 17

Feature level 16

  • [GET /users/me]: Removed pointer from the response, as the "pointer" concept is being removed in Zulip.
  • Changed the rendered HTML markup for mentioning a time to use the <time> HTML tag. It is OK for clients to ignore the previous time mention markup, as the feature was not advertised before this change.

Feature level 15

  • Added spoilers to supported Markdown features.

Feature level 14

  • GET users/me/subscriptions: Removed the is_old_stream field from Stream objects. This field was always equivalent to stream_weekly_traffic != null on the same object.

Feature level 13

  • POST /register: Added bulk_message_deletion to supported client_capabilities.
  • GET /events: message_deleted events have new behavior. The sender and sender_id fields were removed, and the message_id field was replaced by a message_ids list for clients with the bulk_message_deletion client capability. All clients should upgrade; we expect bulk_message_deletion to be required in the future.

Feature level 12

Feature level 11

  • POST /register: Added realm_community_topic_editing_limit_seconds to the response, the time limit before community topic editing is forbidden. A null value means no limit. This was previously hard-coded in the server as 86400 seconds (1 day).
  • POST /register: The response now contains a is_owner, similar to the existing is_admin and is_guest fields.
  • POST /set-typing-status: Removed legacy support for sending email addresses, rather than user IDs, to encode private message recipients.

Feature level 10

  • GET users/me: Added avatar_version, is_guest, is_active, timezone, and date_joined fields to the User objects.
  • GET users/me: Removed client_id and short_name from the response to this endpoint. These fields had no purpose and were inconsistent with other API responses describing users.

Feature level 9

Feature level 8

Feature level 7

  • GET /events: realm_user and realm_bot events no longer contain an email field to identify the user; use the user_id field instead. Previously, some (but not all) events of these types contained an email key in addition to to user_id) for identifying the modified user.
  • PATCH /users/{user_id}: The is_admin and is_guest parameters were removed in favor of the more general role parameter for specifying a change in user role.
  • GET /events: realm_user events sent when a user's role changes now include role property, instead of the previous is_guest or is_admin booleans.
  • GET /realm/emoji: The user who uploaded a given custom emoji is now indicated by an author_id field, replacing a previous author object with unnecessary additional data.

Feature level 6

  • GET /events: realm_user events to update a user's avatar now include the avatar_version field, which is important for correctly refetching medium-size avatar images when the user's avatar changes.
  • GET /users and GET /users/{user_id}: User objects now contain the avatar_version field as well.

Feature level 5

  • GET /events: realm_bot events, sent when changes are made to bot users, now contain an integer-format owner_id field, replacing the owner field (which was an email address).

Feature level 4

  • jitsi_server_url, development_environment, server_generation, password_min_length, password_min_guesses, max_file_upload_size_mib, max_avatar_file_size_mib, server_inline_image_preview, server_inline_url_embed_preview, server_avatar_changes_disabled and server_name_changes_disabled fields are now available via POST /register to make them accessible to all the clients; they were only internally available to Zulip's web app prior to this.

Feature level 3:

  • zulip_version and zulip_feature_level are always returned in POST /register; previously they were only returned if event_types included zulip_version.
  • Added new presence_enabled user notification setting; previously presence was always enabled.

Feature level 2:

  • POST /messages/{message_id}/reactions: The reaction_type parameter is optional; the server will guess the reaction_type if it is not specified (checking custom emoji, then Unicode emoji for any with the provided name).
  • reactions objects returned by the API (both in GET /messages and in GET /events) now include the user who reacted in a top-level user_id field. The legacy user dictionary (which had inconsistent format between those two endpoints) is deprecated.

Feature level 1:

  • GET /server_settings: Added zulip_feature_level, which can be used by clients to detect which of the features described in this changelog are supported.
  • POST /register: Added zulip_feature_level to the response if zulip_version is among the requested event_types.
  • GET /users: User objects for bots now contain a bot_owner_id, replacing the previous bot_owner field (which had the email address of the bot owner).
  • GET /users/{user_id}: Endpoint added.
  • GET /messages: Add support for string-format values for the anchor parameter, deprecating and replacing the use_first_unread_anchor parameter.
  • GET /messages and GET /events: Message objects now use topic_links rather than subject_links to indicate links either present in the topic or generated by linkifiers applied to the topic.
  • POST /users/me/subscriptions: Replaced is_announcement_only boolean with stream_post_policy enum for specifying who can post to a stream.
  • PATCH /streams/{stream_id}: Replaced is_announcement_only boolean with stream_post_policy enum for specifying who can post to a stream.
  • GET /streams: Replaced is_announcement_only boolean with stream_post_policy enum for specifying who can post to a stream.
  • GET /api/v1/user_uploads: Added new endpoint for requesting a temporary URL for an uploaded file that does not require authentication to access (e.g. for passing from a Zulip desktop, mobile, or terminal app to the user's default browser).
  • Added EMAIL_ADDRESS_VISIBILITY_NOBODY possible value for email_address_visibility.
  • Added private_message_policy realm setting.
  • muted_topic objects now are a 3-item tuple: (stream_id, topic, date_muted). Previously, they were a 2-item tuple.
  • GitLab authentication is now available.
  • Added None as a video call provider option.

Changes in Zulip 2.1

  • GET /users: Added include_custom_profile_fields to request custom profile field data.
  • GET /users/me: Added avatar_url field, containing the user's avatar URL, to the response.
  • GET /users/me/subscriptions: Added include_subscribers parameter controlling whether data on the other subscribers is included. Previous behavior was to always send subscriber data.
  • GET /users/me/subscriptions: Stream-level notification settings like push_notifications were changed to be nullable boolean fields (true/false/null), with null meaning that the stream inherits the organization-level default. Previously, the only values were true/false. A client communicates support for this feature using client_capabilities.
  • GET /users/me/subscriptions: Added wildcard_mentions_notify notification setting, with the same global-plus-stream-level-override model as other notification settings.
  • GET /server_settings: Added external_authentication_methods structure, used to display login buttons nicely in the mobile apps.
  • Added first_message_id field to Stream objects. This is helpful for determining whether the stream has any messages older than a window cached in a client.
  • Added is_web_public field to Stream objects. This field is intended to support web-public streams.
  • Added /export/realm endpoints for triggering a data export.
  • PATCH /realm: Added invite_to_stream_policy, create_stream_policy, digest_emails_enabled, digest_weekday, user_group_edit_policy, and avatar_changes_disabled organization settings.
  • Added fluid_layout_width, desktop_icon_count_display, and demote_inactive_streams display settings.
  • enable_stream_sounds was renamed to enable_stream_audible_notifications.
  • Deprecated in_home_view, replacing it with the more readable is_muted (with the opposite meaning).
  • Custom profile fields: Added EXTERNAL_ACCOUNT field type.

Changes in Zulip 2.0

  • POST /messages: Added support for using user IDs and stream IDs for specifying the recipients of a message.
  • POST /messages, POST /messages/{message_id}: Added support for encoding topics using the topic parameter name. The previous subject parameter name was deprecated but is still supported for backwards-compatibility.
  • POST /set-typing-status: Added support for specifying the recipients with user IDs, deprecating the original API of specifying them using email addresses.

Changes not yet stabilized

  • POST /register: Added slim_presence parameter. Changes the format of presence events, but is still being changed and should not be used by clients.