diff --git a/src/api.ts b/src/api.ts
index 301cd1a..b58799b 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -4,6 +4,8 @@ import {
 	getPoolByID,
 	getPoolsWithUser,
 	getUserByID,
+	groups,
+	users,
 } from './data';
 
 export const router = Router();
@@ -23,6 +25,24 @@ router.get('/user', (req, res) => {
 	}
 });
 
+router.post('/user', (req, res) => {
+	if (req.body.userID in users) {
+		res.json({ status: 'error', error: 'already_exists' });
+	} else {
+		users[req.body.userID] = {
+			id: req.body.userID,
+			first_name: req.body.first_name,
+			last_name: req.body.last_name,
+		};
+		res.json({ status: 'success' });
+	}
+});
+
+router.delete('/user', (req, res) => {
+	delete users[req.body.userID];
+	res.json({ status: 'success' });
+});
+
 router.get('/pool', (req, res) => {
 	if (typeof req.query.poolID != 'string') {
 		return;
@@ -38,6 +58,27 @@ router.get('/pool', (req, res) => {
 	}
 });
 
+router.get('/group/:groupID', (req, res) => {
+	if (!(req.params.groupID in groups)) {
+		res.send('invalid group id');
+		return;
+	}
+	res.json(groups[req.params.groupID]);
+});
+
+router.post('/group', (req, res) => {
+	groups[req.body.title] = {
+		id: 'temp id 0',
+		member_ids: [],
+	};
+});
+
+router.patch('/group', (req, res) => {});
+
+router.delete('/group', (req, res) => {
+	delete groups[req.body.groupID];
+});
+
 router.get('/my_pools', (req, res) => {
 	let userID = 'myfatemi04';
 	let poolIDs = getPoolsWithUser(userID);