diff --git a/docs.md b/docs.md
new file mode 100644
index 0000000..add44e5
--- /dev/null
+++ b/docs.md
@@ -0,0 +1,75 @@
+# 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.
diff --git a/src/index.js b/src/index.js
index 48f7be7..f5d5b84 100644
--- a/src/index.js
+++ b/src/index.js
@@ -167,11 +167,6 @@ app.get('/chat/:chatId', middleware.requireToBeLoggedIn, (req, res) => {
 //======================backend===========================
 
 
-//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.
 app.get('/api/getCredentialsById/:id', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const userId = req.params.id;
@@ -182,15 +177,8 @@ app.get('/api/getCredentialsById/:id', middleware.requireToBeLoggedIn, async (re
         console.log(`[ERROR] in /api/getCredentialsById/${req.params.id}}: ${e}`)
         res.status(500).send();
     }
-
 });
 
-//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.
-
 app.get('/api/getIdByCredentials', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const { lastname, firstname, middlename } = req.body;
@@ -202,13 +190,6 @@ app.get('/api/getIdByCredentials', middleware.requireToBeLoggedIn, async (req, r
     }
 });
 
-
-//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.
 app.post('/api/getMessagesFromChat/by-amount', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const userId = sessions[req.session.token].userId;
@@ -245,14 +226,6 @@ app.post('/api/getMessagesFromChat/by-amount', middleware.requireToBeLoggedIn, a
     }
 });
 
-
-//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.
 app.post('/api/getMessagesFromChat/by-time', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const userId = sessions[req.session.token].userId;
@@ -280,11 +253,6 @@ app.post('/api/getMessagesFromChat/by-time', middleware.requireToBeLoggedIn, asy
     }
 });
 
-
-//IN: UserID
-//OUT: Array of chat IDs
-//Returs ids of chats which user with passed ID is member in.
-//Return empty string if user has no membership in any chat.
 app.get('/api/getChats', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const userId = sessions[req.session.token].userId
@@ -297,13 +265,6 @@ app.get('/api/getChats', middleware.requireToBeLoggedIn, async (req, res) => {
     }
 });
 
-//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
 app.get('/api/getChatInfo/:chatId', middleware.requireToBeLoggedIn, async (req, res) => {
     try {
         const chatId = req.params.chatId;
@@ -321,8 +282,7 @@ app.get('/api/getChatInfo/:chatId', middleware.requireToBeLoggedIn, async (req,
         membersRequest.rows.forEach((member, index, membersRequest) => {
             members.push(member.id)
         });
-        // console.log(members)
-        // console.log(sessions[req.session.token])
+        
         if (!members.includes(sessions[req.session.token].userId)) {
             return res.send("-2").status(403).end();
         }