There are docs for the chat.

Docs.md

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+# Docs for smk-chat
+## API
+### /api/getCredentialsById/:userId
+IN: _userId_ (in route)
+
+OUT: _lastname_, _firstname_, _middlename_
+Return credentials of the user whose id is userId.
+Return -1 if no such user exist.
+Requires client to be logged in.
+
+### /api/getIdByCredentials
+IN: _lastname_, _firstname_, _middlename_
+OUT: _UserID_
+Returns an ID of the user, whose lastname, firstname and middlename were passed.
+Returns -1 if user does not exist.
+Requires client to be logged in.
+
+### /api/getMessagesFromChat/by-amount
+IN: _chatId_, _amount_
+OUT: array of objects that represent a message, like {"author_id": ..., time_sent: ..., content: ...}
+Returns an array of last _amount_ ordered by date of described objects if everything is okay
+Returns HTTP/1.1 400 "Chat with id _ID_ does not exist." if no chat with supplied id does not exist.
+Returns HTTP/1.1 403 "You are not a member of this chat" if the statement is true ;)
+Requires client to be logged in.
+
+### /api/getMessagesFromChat/by-time
+IN: _chatId_, _fromTimestamp_, _toTimestamp_
+OUT: array of objects that represent a message, like {"author_id": ..., time_sent: ..., content: ...}
+_fromTimestamp_ must be lower that _toTimestamp_, otherwise it might return nothing.
+Returns an array of described objects if everything is okay
+Returns HTTP/1.1 400 "Chat with id _ID_ does not exist." if no chat with supplied id does not exist.
+Returns HTTP/1.1 200 and an empty string if no messages in chat are found /shrug.
+Requires client to be logged in.
+
+### /api/getChats
+IN: _UserID_
+OUT: Array of chat IDs
+Returs an array with ids of chats which user with passed ID is member in.
+Return empty string if user has no membership in any chat.
+Requires client to be logged in.
+
+### /api/getChatInfo/:chatId
+IN: _chatId_ (in route)
+OUT: JSON describes a chat with id: {name: ..., admins: ..., members: ...}
+Note: JSON does not include messages. You have to use __/api/getMessagesFromChat__ to query messages.
+Returns aforementioned json if the chat exists and user is a member of this chat.
+Returns -1 if chat does not exist
+Return -2 if user is not a member of the chat
+Requires client to be logged in.
+
+### /api/createChat
+IN: _UserId_, array of UserIDs that are to be invited.
+OUT: "Ok" if successful, "User with id _MEMBERID_ does not exist."
+Return -1 if amout of users to invite is 0.
+Requires client to be logged in
+
+### /api/logout
+IN: none.
+OUT: redirect to __/login__.
+Removes client's session, thus unlogging a user.
+Requires client to be logged in.
+
+### /api/register
+IN: _lastname_, _firstname_, _middlename_, _password_
+OUT: redirect to __/__
+Checks if user exist. If so, returns 400 with response "Such user exists.".
+Otherwise, registers a user with given data.
+Requires clinet to be not logged in.
+
+### /api/login
+IN: _lastname_, _firstname_, _middlename_, _password_
+OUT: redirect to __/__
+Checks if user exists. If not, returns 400 with response "No such user.".
+Otherwise, compares passwords
+If passwords match, creating session and redirects to __/__
+Requires client to be not logged in.