diff --git a/controllers/apiCall.js b/controllers/apiCall.js
index 5588616..f45ad46 100644
--- a/controllers/apiCall.js
+++ b/controllers/apiCall.js
@@ -5,16 +5,18 @@ const typedefs = require("../typedefs");
 
 const { axiosInstance } = require("../utils/axios");
 
+const logPrefix = "Spotify API: ";
+
 /**
  * Spotify API - one-off request handler
- * @param {typedefs.Req} req needed for auto-placing headers from middleware
- * @param {typedefs.Res} res handle failure responses here itself
- * @param {typedefs.AxiosMethod} method HTTP method
+ * @param {typedefs.Req} req convenient auto-placing headers from middleware (not a good approach?)
+ * @param {typedefs.Res} res handle failure responses here itself (not a good approach?)
+ * @param {import('axios').Method} method HTTP method
  * @param {string} path request path
- * @param {typedefs.AxiosRequestConfig} config request params, headers, etc.
+ * @param {import('axios').AxiosRequestConfig} config request params, headers, etc.
  * @param {any} data request body
  * @param {boolean} inlineData true if data is to be placed inside config
- * @returns {Promise<{ success: boolean, resp?: any }>}
+ * @returns {Promise<{ success: boolean, resp: any }>}
  */
 const singleRequest = async (req, res, method, path, config = {}, data = null, inlineData = false) => {
 	let resp;
@@ -24,30 +26,44 @@ const singleRequest = async (req, res, method, path, config = {}, data = null, i
 			if (data)
 				config.data = data ?? null;
 			resp = await axiosInstance[method.toLowerCase()](path, config);
-		} else {
+		} else
 			resp = await axiosInstance[method.toLowerCase()](path, data, config);
-		}
 
-		if (resp.status >= 400 && resp.status < 500) {
-			res.status(resp.status).send(resp.data);
-			logger.debug("4XX Response", { resp });
-			return { success: false };
-		}
-		else if (resp.status >= 500) {
-			res.sendStatus(resp.status);
-			logger.warn("5XX Response", { resp });
-			return { success: false };
-		}
-
-		logger.debug("Response received.");
+		logger.debug(logPrefix + "Successful response received.");
 		return { success: true, resp };
 	} catch (error) {
-		res.sendStatus(500);
-		logger.error("Request threw an error.", { error });
+		if (error.response) {
+			// Non 2XX response received
+			let logMsg;
+			if (error.response.status >= 400 && error.response.status < 600) {
+				res.status(error.response.status).send(error.response.data);
+				logMsg = '' + error.response.status
+			}
+			else {
+				res.sendStatus(error.response.status);
+				logMsg = "???";
+			}
+			logger.error(logPrefix + logMsg, {
+				response: {
+					data: error.response.data,
+					status: error.response.status,
+				}
+			});
+		} else if (error.request) {
+			// No response received
+			res.sendStatus(504);
+			logger.warn(logPrefix + "No response");
+		} else {
+			// Something happened in setting up the request that triggered an Error
+			res.sendStatus(500);
+			logger.error(logPrefix + "Request failed?");
+		}
+
 		return { success: false };
-	}
+	};
 }
 
+
 module.exports = {
 	singleRequest,
 }
\ No newline at end of file
diff --git a/controllers/auth.js b/controllers/auth.js
index 9705f51..3d8e317 100644
--- a/controllers/auth.js
+++ b/controllers/auth.js
@@ -1,9 +1,10 @@
 const { authInstance, axiosInstance } = require("../utils/axios");
 
 const typedefs = require("../typedefs");
-const { scopes, stateKey, accountsAPIURL, sessionAgeInSeconds } = require('../constants');
+const { scopes, stateKey, accountsAPIURL, sessionAgeInSeconds, sessionName } = require('../constants');
 
 const generateRandString = require('../utils/generateRandString');
+const { singleRequest } = require("./apiCall");
 const logger = require('../utils/logger')(module);
 
 /**
@@ -17,7 +18,7 @@ const login = (_req, res) => {
 		res.cookie(stateKey, state);
 
 		const scope = Object.values(scopes).join(' ');
-		return res.redirect(
+		res.redirect(
 			`${accountsAPIURL}/authorize?` +
 			new URLSearchParams({
 				response_type: 'code',
@@ -27,9 +28,11 @@ const login = (_req, res) => {
 				state: state
 			}).toString()
 		);
+		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('login', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -45,11 +48,13 @@ const callback = async (req, res) => {
 
 		// check state
 		if (state === null || state !== storedState) {
+			res.redirect(409, '/');
 			logger.error('state mismatch');
-			return res.redirect(409, '/');
+			return;
 		} else if (error) {
+			res.status(401).send("Auth callback error");
 			logger.error('callback error', { error });
-			return res.status(401).send("Auth callback error");
+			return;
 		} else {
 			// get auth tokens
 			res.clearCookie(stateKey);
@@ -65,7 +70,7 @@ const callback = async (req, res) => {
 			const tokenResponse = await authInstance.post('/api/token', authPayload);
 
 			if (tokenResponse.status === 200) {
-				logger.info('New login.');
+				logger.debug('Tokens obtained.');
 				req.session.accessToken = tokenResponse.data.access_token;
 				req.session.refreshToken = tokenResponse.data.refresh_token;
 				req.session.cookie.maxAge = 7 * 24 * 60 * 60 * 1000 // 1 week
@@ -74,30 +79,27 @@ const callback = async (req, res) => {
 				res.status(tokenResponse.status).send('Error: Login failed');
 			}
 
-			const userResponse = await axiosInstance.get(
-				"/me",
-				{
-					headers: {
-						'Authorization': `Bearer ${req.session.accessToken}`
-					}
-				}
+			const userResp = await singleRequest(req, res,
+				"GET", "/me",
+				{ headers: { Authorization: `Bearer ${req.session.accessToken}` } }
 			);
-			if (userResponse.status >= 400 && userResponse.status < 500)
-				return res.status(userResponse.status).send(userResponse.data);
-			else if (userResponse.status >= 500)
-				return res.sendStatus(userResponse.status);
+			if (!userResp.success) return;
+			const userData = userResp.resp.data;
 
 			/** @type {typedefs.User} */
 			req.session.user = {
-				username: userResponse.data.display_name,
-				id: userResponse.data.id,
+				username: userData.display_name,
+				id: userData.id,
 			};
 
-			return res.sendStatus(200);
+			res.sendStatus(200);
+			logger.info("New login.", { username: userData.display_name });
+			return;
 		}
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('callback', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -121,15 +123,18 @@ const refresh = async (req, res) => {
 			req.session.accessToken = response.data.access_token;
 			req.session.refreshToken = response.data.refresh_token ?? req.session.refreshToken; // refresh token rotation
 
+			res.sendStatus(200);
 			logger.info(`Access token refreshed${(response.data.refresh_token !== null) ? ' and refresh token updated' : ''}.`);
-			return res.sendStatus(200);
+			return;
 		} else {
+			res.status(response.status).send('Error: Refresh token flow failed.');
 			logger.error('refresh failed', { statusCode: response.status });
-			return res.status(response.status).send('Error: Refresh token flow failed.');
+			return;
 		}
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('refresh', { error });
-		return res.sendStatus(500);
+		return;
 	}
 };
 
@@ -142,17 +147,20 @@ const logout = async (req, res) => {
 	try {
 		const delSession = req.session.destroy((err) => {
 			if (err) {
+				res.sendStatus(500);
 				logger.error("Error while logging out", { err });
-				return res.sendStatus(500);
+				return;
 			} else {
+				res.clearCookie(sessionName);
+				res.sendStatus(200);
 				logger.info("Logged out.", { sessionID: delSession.id });
-				res.clearCookie("connect.sid");
-				return res.sendStatus(200);
+				return;
 			}
 		})
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('logout', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
diff --git a/controllers/operations.js b/controllers/operations.js
index 2f66a30..4c2f070 100644
--- a/controllers/operations.js
+++ b/controllers/operations.js
@@ -1,12 +1,11 @@
 const typedefs = require("../typedefs");
 const logger = require("../utils/logger")(module);
 
-const { axiosInstance } = require("../utils/axios");
-const myGraph = require("../utils/graph");
+const { singleRequest } = require("./apiCall");
 const { parseSpotifyLink } = require("../utils/spotifyURITransformer");
+const myGraph = require("../utils/graph");
 
 const { Op } = require("sequelize");
-const { singleRequest } = require("./apiCall");
 /** @type {typedefs.Model} */
 const Playlists = require("../models").playlists;
 /** @type {typedefs.Model} */
@@ -23,43 +22,34 @@ const updateUser = async (req, res) => {
 		const uID = req.session.user.id;
 
 		// get first 50
-		const response = await axiosInstance.get(
+		const response = await singleRequest(req, res,
+			"GET",
 			`/users/${uID}/playlists`,
 			{
 				params: {
 					offset: 0,
 					limit: 50,
 				},
-				headers: req.sessHeaders
-			}
-		);
+			});
+		if (!response.success) return;
+		const respData = response.resp.data;
 
-		if (response.status >= 400 && response.status < 500)
-			return res.status(response.status).send(response.data);
-		else if (response.status >= 500)
-			return res.sendStatus(response.status);
-
-		currentPlaylists = response.data.items.map(playlist => {
+		currentPlaylists = respData.items.map(playlist => {
 			return {
 				playlistID: playlist.id,
 				playlistName: playlist.name
 			}
 		});
-		nextURL = response.data.next;
+		let nextURL = respData.next;
 
 		// keep getting batches of 50 till exhausted
 		while (nextURL) {
-			const nextResponse = await axiosInstance.get(
-				nextURL, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-			if (response.status >= 400 && response.status < 500)
-				return res.status(response.status).send(response.data);
-			else if (response.status >= 500)
-				return res.sendStatus(response.status);
+			const nextResp = await singleRequest(req, res, "GET", nextURL);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			currentPlaylists.push(
-				...nextResponse.data.items.map(playlist => {
+				...nextData.items.map(playlist => {
 					return {
 						playlistID: playlist.id,
 						playlistName: playlist.name
@@ -67,7 +57,7 @@ const updateUser = async (req, res) => {
 				})
 			);
 
-			nextURL = nextResponse.data.next;
+			nextURL = nextData.next;
 		}
 
 		let oldPlaylists = await Playlists.findAll({
@@ -117,8 +107,9 @@ const updateUser = async (req, res) => {
 				where: { playlistID: toRemovePlIDs }
 			});
 			if (cleanedUser !== toRemovePls.length) {
+				res.sendStatus(500);
 				logger.error("Could not remove all old playlists", { error: new Error("Playlists.destroy failed?") });
-				return res.sendStatus(500);
+				return;
 			}
 		}
 
@@ -128,16 +119,19 @@ const updateUser = async (req, res) => {
 				{ validate: true }
 			);
 			if (updatedUser.length !== toAddPls.length) {
+				res.sendStatus(500);
 				logger.error("Could not add all new playlists", { error: new Error("Playlists.bulkCreate failed?") });
-				return res.sendStatus(500);
+				return;
 			}
 		}
 
+		res.status(200).send({ removedLinks });
 		logger.info("Updated user data", { delLinks: removedLinks, delPls: cleanedUser, addPls: updatedUser.length });
-		return res.status(200).send({ removedLinks });
+		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('updateUser', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -166,14 +160,16 @@ const fetchUser = async (req, res) => {
 			},
 		});
 
-		logger.info("Fetched user data", { pls: currentPlaylists.length, links: currentLinks.length });
-		return res.status(200).send({
+		res.status(200).send({
 			playlists: currentPlaylists,
 			links: currentLinks
 		});
+		logger.info("Fetched user data", { pls: currentPlaylists.length, links: currentLinks.length });
+		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('fetchUser', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -191,11 +187,15 @@ const createLink = async (req, res) => {
 			fromPl = parseSpotifyLink(req.body["from"]);
 			toPl = parseSpotifyLink(req.body["to"]);
 			if (fromPl.type !== "playlist" || toPl.type !== "playlist") {
-				return res.status(400).send({ message: "Link is not a playlist" });
+				res.status(400).send({ message: "Link is not a playlist" });
+				logger.warn("non-playlist link provided", { from: fromPl, to: toPl });
+
+				return;
 			}
 		} catch (error) {
+			res.status(400).send({ message: "Invalid Spotify playlist link" });
 			logger.error("parseSpotifyLink", { error });
-			return res.status(400).send({ message: "Invalid Spotify playlist link" });
+			return;
 		}
 
 		let playlists = await Playlists.findAll({
@@ -207,8 +207,9 @@ const createLink = async (req, res) => {
 
 		// if playlists are unknown
 		if (![fromPl, toPl].every(pl => playlists.includes(pl.id))) {
+			res.sendStatus(404);
 			logger.error("unknown playlists, resync");
-			return res.sendStatus(404);
+			return;
 		}
 
 		// check if exists
@@ -222,8 +223,9 @@ const createLink = async (req, res) => {
 			}
 		});
 		if (existingLink) {
+			res.sendStatus(409);
 			logger.error("link already exists");
-			return res.sendStatus(409);
+			return;
 		}
 
 		const allLinks = await Links.findAll({
@@ -235,8 +237,9 @@ const createLink = async (req, res) => {
 		const newGraph = new myGraph(playlists, [...allLinks, { from: fromPl.id, to: toPl.id }]);
 
 		if (newGraph.detectCycle()) {
+			res.status(400).send({ message: "Proposed link cannot cause a cycle in the graph" });
 			logger.error("potential cycle detected");
-			return res.status(400).send({ message: "Proposed link cannot cause a cycle in the graph" });
+			return;
 		}
 
 		const newLink = await Links.create({
@@ -245,15 +248,18 @@ const createLink = async (req, res) => {
 			to: toPl.id
 		});
 		if (!newLink) {
+			res.sendStatus(500);
 			logger.error("Could not create link", { error: new Error("Links.create failed?") });
-			return res.sendStatus(500);
+			return;
 		}
 
+		res.sendStatus(201);
 		logger.info("Created link");
-		return res.sendStatus(201);
+		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('createLink', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -272,11 +278,14 @@ const removeLink = async (req, res) => {
 			fromPl = parseSpotifyLink(req.body["from"]);
 			toPl = parseSpotifyLink(req.body["to"]);
 			if (fromPl.type !== "playlist" || toPl.type !== "playlist") {
-				return res.status(400).send({ message: "Link is not a playlist" });
+				res.status(400).send({ message: "Link is not a playlist" });
+				logger.warn("non-playlist link provided", { from: fromPl, to: toPl });
+				return;
 			}
 		} catch (error) {
+			res.status(400).send({ message: "Invalid Spotify playlist link" });
 			logger.error("parseSpotifyLink", { error });
-			return res.status(400).send({ message: "Invalid Spotify playlist link" });
+			return;
 		}
 
 		// check if exists
@@ -290,8 +299,9 @@ const removeLink = async (req, res) => {
 			}
 		});
 		if (!existingLink) {
+			res.sendStatus(409);
 			logger.error("link does not exist");
-			return res.sendStatus(409);
+			return;
 		}
 
 		const removedLink = await Links.destroy({
@@ -304,15 +314,18 @@ const removeLink = async (req, res) => {
 			}
 		});
 		if (!removedLink) {
+			res.sendStatus(500);
 			logger.error("Could not remove link", { error: new Error("Links.destroy failed?") });
-			return res.sendStatus(500);
+			return;
 		}
 
+		res.sendStatus(200);
 		logger.info("Deleted link");
-		return res.sendStatus(200);
+		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('removeLink', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -397,28 +410,26 @@ const populateMissingInLink = async (req, res) => {
 
 		let initialFields = ["tracks(next,items(is_local,track(uri)))"];
 		let mainFields = ["next", "items(is_local,track(uri))"];
-		const fromData = await axiosInstance.get(
+
+		const fromResp = await singleRequest(req, res,
+			"GET",
 			`/playlists/${fromPl.id}/`,
 			{
 				params: {
 					fields: initialFields.join()
 				},
-				headers: req.sessHeaders
-			}
-		);
-		if (fromData.status >= 400 && fromData.status < 500)
-			return res.status(fromData.status).send(fromData.data);
-		else if (fromData.status >= 500)
-			return res.sendStatus(fromData.status);
+			});
+		if (!fromResp.success) return;
+		const fromData = fromResp.resp.data;
 
 		let fromPlaylist = {};
 		// varying fields again smh
-		if (fromData.data.tracks.next) {
-			fromPlaylist.next = new URL(fromData.data.tracks.next);
+		if (fromData.tracks.next) {
+			fromPlaylist.next = new URL(fromData.tracks.next);
 			fromPlaylist.next.searchParams.set("fields", mainFields.join());
 			fromPlaylist.next = fromPlaylist.next.href;
 		}
-		fromPlaylist.tracks = fromData.data.tracks.items.map((playlist_item) => {
+		fromPlaylist.tracks = fromData.tracks.items.map((playlist_item) => {
 			return {
 				is_local: playlist_item.is_local,
 				uri: playlist_item.track.uri
@@ -428,18 +439,13 @@ const populateMissingInLink = async (req, res) => {
 
 		// keep getting batches of 50 till exhausted
 		while (fromPlaylist.next) {
-			const nextResponse = await axiosInstance.get(
-				fromPlaylist.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-
-			if (nextResponse.status >= 400 && nextResponse.status < 500)
-				return res.status(nextResponse.status).send(nextResponse.data);
-			else if (nextResponse.status >= 500)
-				return res.sendStatus(nextResponse.status);
+			const nextResp = await singleRequest(req, res,
+				"GET", fromPlaylist.next);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			fromPlaylist.tracks.push(
-				...nextResponse.data.items.map((playlist_item) => {
+				...nextData.items.map((playlist_item) => {
 					return {
 						is_local: playlist_item.is_local,
 						uri: playlist_item.track.uri
@@ -447,32 +453,30 @@ const populateMissingInLink = async (req, res) => {
 				})
 			);
 
-			fromPlaylist.next = nextResponse.data.next;
+			fromPlaylist.next = nextData.next;
 		}
 
 		delete fromPlaylist.next;
-		const toData = await axiosInstance.get(
+
+		const toResp = await singleRequest(req, res,
+			"GET",
 			`/playlists/${toPl.id}/`,
 			{
 				params: {
 					fields: initialFields.join()
 				},
-				headers: req.sessHeaders
-			}
-		);
-		if (toData.status >= 400 && toData.status < 500)
-			return res.status(toData.status).send(toData.data);
-		else if (toData.status >= 500)
-			return res.sendStatus(toData.status);
+			});
+		if (!toResp.success) return;
+		const toData = toResp.resp.data;
 
 		let toPlaylist = {};
 		// varying fields again smh
-		if (toData.data.tracks.next) {
-			toPlaylist.next = new URL(toData.data.tracks.next);
+		if (toData.tracks.next) {
+			toPlaylist.next = new URL(toData.tracks.next);
 			toPlaylist.next.searchParams.set("fields", mainFields.join());
 			toPlaylist.next = toPlaylist.next.href;
 		}
-		toPlaylist.tracks = toData.data.tracks.items.map((playlist_item) => {
+		toPlaylist.tracks = toData.tracks.items.map((playlist_item) => {
 			return {
 				is_local: playlist_item.is_local,
 				uri: playlist_item.track.uri
@@ -481,18 +485,12 @@ const populateMissingInLink = async (req, res) => {
 
 		// keep getting batches of 50 till exhausted
 		while (toPlaylist.next) {
-			const nextResponse = await axiosInstance.get(
-				toPlaylist.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-
-			if (nextResponse.status >= 400 && nextResponse.status < 500)
-				return res.status(nextResponse.status).send(nextResponse.data);
-			else if (nextResponse.status >= 500)
-				return res.sendStatus(nextResponse.status);
-
+			const nextResp = await singleRequest(req, res,
+				"GET", toPlaylist.next);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 			toPlaylist.tracks.push(
-				...nextResponse.data.items.map((playlist_item) => {
+				...nextData.items.map((playlist_item) => {
 					return {
 						is_local: playlist_item.is_local,
 						uri: playlist_item.track.uri
@@ -500,7 +498,7 @@ const populateMissingInLink = async (req, res) => {
 				})
 			);
 
-			toPlaylist.next = nextResponse.data.next;
+			toPlaylist.next = nextData.next;
 		}
 
 		delete toPlaylist.next;
@@ -613,50 +611,42 @@ const pruneExcessInLink = async (req, res) => {
 
 		let initialFields = ["snapshot_id", "tracks(next,items(is_local,track(uri)))"];
 		let mainFields = ["next", "items(is_local,track(uri))"];
-		const fromData = await axiosInstance.get(
+
+		const fromResp = await singleRequest(req, res,
+			"GET",
 			`/playlists/${fromPl.id}/`,
 			{
 				params: {
 					fields: initialFields.join()
 				},
-				headers: req.sessHeaders
-			}
-		);
-		if (fromData.status >= 400 && fromData.status < 500)
-			return res.status(fromData.status).send(fromData.data);
-		else if (fromData.status >= 500)
-			return res.sendStatus(fromData.status);
+			});
+		if (!fromResp.success) return;
+		const fromData = fromResp.resp.data;
 
 		let fromPlaylist = {};
 		// varying fields again smh
-		fromPlaylist.snapshot_id = fromData.data.snapshot_id;
-		if (fromData.data.tracks.next) {
-			fromPlaylist.next = new URL(fromData.data.tracks.next);
+		fromPlaylist.snapshot_id = fromData.snapshot_id;
+		if (fromData.tracks.next) {
+			fromPlaylist.next = new URL(fromData.tracks.next);
 			fromPlaylist.next.searchParams.set("fields", mainFields.join());
 			fromPlaylist.next = fromPlaylist.next.href;
 		}
-		fromPlaylist.tracks = fromData.data.tracks.items.map((playlist_item) => {
+		fromPlaylist.tracks = fromData.tracks.items.map((playlist_item) => {
 			return {
 				is_local: playlist_item.is_local,
 				uri: playlist_item.track.uri
 			}
 		});
 
-
 		// keep getting batches of 50 till exhausted
 		while (fromPlaylist.next) {
-			const nextResponse = await axiosInstance.get(
-				fromPlaylist.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-
-			if (nextResponse.status >= 400 && nextResponse.status < 500)
-				return res.status(nextResponse.status).send(nextResponse.data);
-			else if (nextResponse.status >= 500)
-				return res.sendStatus(nextResponse.status);
+			const nextResp = await singleRequest(req, res,
+				"GET", fromPlaylist.next);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			fromPlaylist.tracks.push(
-				...nextResponse.data.items.map((playlist_item) => {
+				...nextData.items.map((playlist_item) => {
 					return {
 						is_local: playlist_item.is_local,
 						uri: playlist_item.track.uri
@@ -664,33 +654,29 @@ const pruneExcessInLink = async (req, res) => {
 				})
 			);
 
-			fromPlaylist.next = nextResponse.data.next;
+			fromPlaylist.next = nextData.next;
 		}
 
 		delete fromPlaylist.next;
-		const toData = await axiosInstance.get(
+		const toResp = await singleRequest(req, res,
+			"GET",
 			`/playlists/${toPl.id}/`,
 			{
 				params: {
 					fields: initialFields.join()
 				},
-				headers: req.sessHeaders
-			}
-		);
-		if (toData.status >= 400 && toData.status < 500)
-			return res.status(toData.status).send(toData.data);
-		else if (toData.status >= 500)
-			return res.sendStatus(toData.status);
-
+			});
+		if (!toResp.success) return;
+		const toData = toResp.resp.data;
 		let toPlaylist = {};
 		// varying fields again smh
-		toPlaylist.snapshot_id = toData.data.snapshot_id;
-		if (toData.data.tracks.next) {
-			toPlaylist.next = new URL(toData.data.tracks.next);
+		toPlaylist.snapshot_id = toData.snapshot_id;
+		if (toData.tracks.next) {
+			toPlaylist.next = new URL(toData.tracks.next);
 			toPlaylist.next.searchParams.set("fields", mainFields.join());
 			toPlaylist.next = toPlaylist.next.href;
 		}
-		toPlaylist.tracks = toData.data.tracks.items.map((playlist_item) => {
+		toPlaylist.tracks = toData.tracks.items.map((playlist_item) => {
 			return {
 				is_local: playlist_item.is_local,
 				uri: playlist_item.track.uri
@@ -699,18 +685,13 @@ const pruneExcessInLink = async (req, res) => {
 
 		// keep getting batches of 50 till exhausted
 		while (toPlaylist.next) {
-			const nextResponse = await axiosInstance.get(
-				toPlaylist.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-
-			if (nextResponse.status >= 400 && nextResponse.status < 500)
-				return res.status(nextResponse.status).send(nextResponse.data);
-			else if (nextResponse.status >= 500)
-				return res.sendStatus(nextResponse.status);
+			const nextResp = await singleRequest(req, res,
+				"GET", toPlaylist.next);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			toPlaylist.tracks.push(
-				...nextResponse.data.items.map((playlist_item) => {
+				...nextData.items.map((playlist_item) => {
 					return {
 						is_local: playlist_item.is_local,
 						uri: playlist_item.track.uri
@@ -718,7 +699,7 @@ const pruneExcessInLink = async (req, res) => {
 				})
 			);
 
-			toPlaylist.next = nextResponse.data.next;
+			toPlaylist.next = nextData.next;
 		}
 
 		delete toPlaylist.next;
diff --git a/controllers/playlists.js b/controllers/playlists.js
index 843f7a8..40361c5 100644
--- a/controllers/playlists.js
+++ b/controllers/playlists.js
@@ -1,7 +1,7 @@
 const logger = require("../utils/logger")(module);
 
 const typedefs = require("../typedefs");
-const { axiosInstance } = require('../utils/axios');
+const { singleRequest } = require("./apiCall");
 const { parseSpotifyLink } = require("../utils/spotifyURITransformer");
 
 /**
@@ -14,26 +14,21 @@ const getUserPlaylists = async (req, res) => {
 		let userPlaylists = {};
 
 		// get first 50
-		const response = await axiosInstance.get(
+		const response = await singleRequest(req, res,
+			"GET",
 			`/users/${req.session.user.id}/playlists`,
 			{
 				params: {
 					offset: 0,
-					limit: 50,
+					limit: 100,
 				},
-				headers: req.sessHeaders
-			}
-		);
+			});
+		if (!response.success) return;
+		const respData = response.resp.data;
 
-		if (response.status >= 400 && response.status < 500)
-			return res.status(response.status).send(response.data);
-		else if (response.status >= 500)
-			return res.sendStatus(response.status);
+		userPlaylists.total = respData.total;
 
-		userPlaylists.total = response.data.total;
-
-		/** @type {typedefs.SimplifiedPlaylist[]} */
-		userPlaylists.items = response.data.items.map((playlist) => {
+		userPlaylists.items = respData.items.map((playlist) => {
 			return {
 				uri: playlist.uri,
 				images: playlist.images,
@@ -42,21 +37,16 @@ const getUserPlaylists = async (req, res) => {
 			}
 		});
 
-		userPlaylists.next = response.data.next;
-
+		userPlaylists.next = respData.next;
 		// keep getting batches of 50 till exhausted
 		while (userPlaylists.next) {
-			const nextResponse = await axiosInstance.get(
-				userPlaylists.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-			if (response.status >= 400 && response.status < 500)
-				return res.status(response.status).send(response.data);
-			else if (response.status >= 500)
-				return res.sendStatus(response.status);
+			const nextResp = await singleRequest(req, res,
+				"GET", userPlaylists.next);
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			userPlaylists.items.push(
-				...nextResponse.data.items.map((playlist) => {
+				...nextData.items.map((playlist) => {
 					return {
 						uri: playlist.uri,
 						images: playlist.images,
@@ -66,7 +56,7 @@ const getUserPlaylists = async (req, res) => {
 				})
 			);
 
-			userPlaylists.next = nextResponse.data.next;
+			userPlaylists.next = nextData.next;
 		}
 
 		delete userPlaylists.next;
@@ -75,8 +65,9 @@ const getUserPlaylists = async (req, res) => {
 		logger.debug("Fetched user's playlists", { num: userPlaylists.total });
 		return;
 	} catch (error) {
+		res.sendStatus(500);
 		logger.error('getUserPlaylists', { error });
-		return res.sendStatus(500);
+		return;
 	}
 }
 
@@ -87,7 +78,7 @@ const getUserPlaylists = async (req, res) => {
  */
 const getPlaylistDetails = async (req, res) => {
 	try {
-		/** @type {typedefs.Playlist} */
+		/** @type {typedefs.PlaylistDetails} */
 		let playlist = {};
 		/** @type {typedefs.URIObject} */
 		let uri;
@@ -108,39 +99,36 @@ const getPlaylistDetails = async (req, res) => {
 			return;
 		}
 
-		const response = await axiosInstance.get(
+		const response = await singleRequest(req, res,
+			"GET",
 			`/playlists/${uri.id}/`,
 			{
 				params: {
 					fields: initialFields.join()
 				},
-				headers: req.sessHeaders
-			}
-		);
-		if (response.status >= 400 && response.status < 500)
-			return res.status(response.status).send(response.data);
-		else if (response.status >= 500)
-			return res.sendStatus(response.status);
+			});
+		if (!response.success) return;
+		const respData = response.resp.data;
 
 		// TODO: this whole section needs to be DRYer
 		// look into serializr
-		playlist.name = response.data.name;
-		playlist.description = response.data.description;
-		playlist.collaborative = response.data.collaborative;
-		playlist.public = response.data.public;
-		playlist.images = { ...response.data.images };
-		playlist.owner = { ...response.data.owner };
-		playlist.snapshot_id = response.data.snapshot_id;
-		playlist.total = response.data.tracks.total;
+		playlist.name = respData.name;
+		playlist.description = respData.description;
+		playlist.collaborative = respData.collaborative;
+		playlist.public = respData.public;
+		playlist.images = [...respData.images];
+		playlist.owner = { ...respData.owner };
+		playlist.snapshot_id = respData.snapshot_id;
+		playlist.total = respData.tracks.total;
 
 		// previous fields get carried over to the next URL, but most of these fields are not present in the new endpoint
 		// API shouldn't be returning such URLs, the problem's in the API ig...
-		if (response.data.tracks.next) {
-			playlist.next = new URL(response.data.tracks.next);
+		if (respData.tracks.next) {
+			playlist.next = new URL(respData.tracks.next);
 			playlist.next.searchParams.set("fields", mainFields.join());
 			playlist.next = playlist.next.href;
 		}
-		playlist.tracks = response.data.tracks.items.map((playlist_item) => {
+		playlist.tracks = respData.tracks.items.map((playlist_item) => {
 			return {
 				is_local: playlist_item.is_local,
 				track: {
@@ -154,18 +142,14 @@ const getPlaylistDetails = async (req, res) => {
 
 		// keep getting batches of 50 till exhausted
 		while (playlist.next) {
-			const nextResponse = await axiosInstance.get(
-				playlist.next, // absolute URL from previous response which has params
-				{ headers: req.sessHeaders }
-			);
-
-			if (nextResponse.status >= 400 && nextResponse.status < 500)
-				return res.status(nextResponse.status).send(nextResponse.data);
-			else if (nextResponse.status >= 500)
-				return res.sendStatus(nextResponse.status);
+			const nextResp = await singleRequest(req, res,
+				"GET", playlist.next
+			)
+			if (!nextResp.success) return;
+			const nextData = nextResp.resp.data;
 
 			playlist.tracks.push(
-				...nextResponse.data.items.map((playlist_item) => {
+				...nextData.items.map((playlist_item) => {
 					return {
 						is_local: playlist_item.is_local,
 						track: {
@@ -177,7 +161,7 @@ const getPlaylistDetails = async (req, res) => {
 				})
 			);
 
-			playlist.next = nextResponse.data.next;
+			playlist.next = nextData.next;
 		}
 
 		delete playlist.next;
diff --git a/index.js b/index.js
index cb00514..4d94ed7 100644
--- a/index.js
+++ b/index.js
@@ -67,7 +67,6 @@ app.use((_req, res) => {
 const port = process.env.PORT || 3000;
 
 const server = app.listen(port, () => {
-	logger.debug("-", { _: "_".repeat(100) });
 	logger.info(`App Listening on port ${port}`);
 });
 
diff --git a/typedefs.js b/typedefs.js
index e2ade3e..5ebe5e9 100644
--- a/typedefs.js
+++ b/typedefs.js
@@ -5,9 +5,6 @@
  * @typedef {import('express').Response} Res
  * @typedef {import('express').NextFunction} Next
  * 
- * @typedef {import('axios').Method} AxiosMethod
- * @typedef {import('axios').AxiosRequestConfig} AxiosRequestConfig
- * 
  * @typedef {import("sequelize").Sequelize} Sequelize
  * @typedef {import("sequelize").Model} Model
  * @typedef {import("sequelize").QueryInterface} QueryInterface
@@ -25,7 +22,7 @@
  * }} URIObject
  * 
  * @typedef {{
- * display_name: string,
+ * username: string,
  * uri: string
  * }} User
  * 
@@ -70,7 +67,7 @@
  * owner: User,
  * images: ImageObject[],
  * tracks: PlaylistTrack[],
- * }} Playlist
+ * }} PlaylistDetails
  */
 
 exports.unused = {};
\ No newline at end of file
diff --git a/utils/axios.js b/utils/axios.js
index 92b4aab..294d428 100644
--- a/utils/axios.js
+++ b/utils/axios.js
@@ -25,6 +25,7 @@ axiosInstance.interceptors.request.use(config => {
 		url: config.url,
 		method: config.method,
 		params: config.params ?? {},
+		headers: Object.keys(config.headers),
 	});
 	return config;
 });
@@ -32,9 +33,15 @@ axiosInstance.interceptors.request.use(config => {
 axiosInstance.interceptors.response.use(
 	(response) => response,
 	(error) => {
-		logger.warn("AxiosError", { req: error.config });
-		if (error.response)
-			return error.response;
+		logger.warn("AxiosError", {
+			error: {
+				name: error.name,
+				code: error.code,
+				message: error.message,
+				stack: error.stack,
+			},
+			req: error.config,
+		});
 		return Promise.reject(error);
 	}
 );
diff --git a/utils/logger.js b/utils/logger.js
index 9f06351..6b8daba 100644
--- a/utils/logger.js
+++ b/utils/logger.js
@@ -6,27 +6,17 @@ const { colorize, combine, label, timestamp, printf, errors } = format;
 const typedefs = require("../typedefs");
 
 const getLabel = (callingModule) => {
-    const parts = callingModule.filename.split(path.sep);
+    if (!callingModule.filename) return "repl";
+    const parts = callingModule.filename?.split(path.sep);
     return path.join(parts[parts.length - 2], parts.pop());
 };
 
-const allowedErrorKeys = ["name", "message", "stack"];
-
-const logMetaReplacer = (key, value) => {
-    if (key === "error") {
-        return {
-            name: value.name,
-            message: value.message,
-            stack: value.stack,
-        };
-    }
-    return value;
-}
+const allowedErrorKeys = ["name", "code", "message", "stack"];
 
 const metaFormat = (meta) => {
     if (Object.keys(meta).length > 0)
-        return '\n' + JSON.stringify(meta, logMetaReplacer, "\t") + '\n';
-    return '\n';
+        return '\n' + JSON.stringify(meta, null, "\t");
+    return '';
 }
 
 const logFormat = printf(({ level, message, label, timestamp, ...meta }) => {
@@ -36,6 +26,9 @@ const logFormat = printf(({ level, message, label, timestamp, ...meta }) => {
                 delete meta.error[key];
             }
         }
+        const { stack, ...rest } = meta.error;
+        return `${timestamp} [${label}] ${level}: ${message}${metaFormat(rest)}\n` +
+            `${stack}`;
     }
     return `${timestamp} [${label}] ${level}: ${message}${metaFormat(meta)}`;
 });
@@ -46,12 +39,12 @@ const logFormat = printf(({ level, message, label, timestamp, ...meta }) => {
  * @returns {typedefs.Logger} 
  */
 const logger = (callingModule) => {
-    return createLogger({
+    let tmpLogger = createLogger({
         levels: config.npm.levels,
         format: combine(
             errors({ stack: true }),
             label({ label: getLabel(callingModule) }),
-            timestamp({ format: 'YYYY-MM-DD HH:mm:ss.SSS' }),
+            timestamp({ format: 'YYYY-MM-DD HH:mm:ss' }),
             logFormat,
         ),
         transports: [
@@ -68,6 +61,8 @@ const logger = (callingModule) => {
             }),
         ]
     });
+    tmpLogger.on('error', (error) => tmpLogger.crit("Error inside logger", { error }));
+    return tmpLogger;
 }
 
 module.exports = logger;
\ No newline at end of file
diff --git a/validators/index.js b/validators/index.js
index 8a2f904..6d5d3b5 100644
--- a/validators/index.js
+++ b/validators/index.js
@@ -21,10 +21,12 @@ const validate = (req, res, next) => {
 		[err.path]: err.msg
 	}));
 
-	return res.status(400).json({
+	res.status(400).json({
 		message: getNestedValuesString(extractedErrors),
 		errors: extractedErrors
 	});
+	logger.warn("invalid request", { extractedErrors });
+	return;
 }
 
 module.exports = {