diff --git a/src/routes/api/v1/categories.ts b/src/routes/api/v1/categories.ts
index ace112a..b3454eb 100644
--- a/src/routes/api/v1/categories.ts
+++ b/src/routes/api/v1/categories.ts
@@ -5,7 +5,7 @@ import { prisma, __path, log } from '../../../index.js';
 function get(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.query.name) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -19,7 +19,7 @@ function get(req: Request, res: Response) {
 			if (item) {
 				res.status(200).json(JSON.stringify(item));
 			} else {
-				res.status(410).json({ error: 'Category does not exist.' });
+				res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Category does not exist' });
 			}
 		})
 		.catch((err) => {
@@ -32,7 +32,7 @@ function get(req: Request, res: Response) {
 function post(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.name) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -49,16 +49,17 @@ function post(req: Request, res: Response) {
 		})
 		.then((data) => {
 			res.status(201).json({ status: 'created', id: data.id });
+
 		})
 		.catch((err) => {
 			// Check if an entry already exists.
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'Category already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'Category already exists' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 }
@@ -67,7 +68,7 @@ function post(req: Request, res: Response) {
 async function patch(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id || !req.body.name) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -80,12 +81,12 @@ async function patch(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'Category does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Category does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.itemCategory
@@ -106,10 +107,10 @@ async function patch(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'Category already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'Category already exists' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 }
@@ -118,7 +119,7 @@ async function patch(req: Request, res: Response) {
 async function del(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -131,12 +132,12 @@ async function del(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'Category does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Category does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.itemCategory
@@ -146,11 +147,11 @@ async function del(req: Request, res: Response) {
 			}
 		})
 		.then(() => {
-			res.status(200).json({ status: 'deleted' });
+			res.status(200).json({ errorcode: 'DELETED', error: 'Sucessfully deleted entry' });
 		})
 		.catch((err) => {
 			log.db.error(err);
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 		});
 }
 
diff --git a/src/routes/api/v1/items.ts b/src/routes/api/v1/items.ts
index 7bb9648..27a1ab7 100644
--- a/src/routes/api/v1/items.ts
+++ b/src/routes/api/v1/items.ts
@@ -1,12 +1,13 @@
 import { Request, Response } from 'express';
 import { prisma, __path, log } from '../../../index.js';
+//import { itemStatus } from '@prisma/client';
 
 // Get item.
 function get(req: Request, res: Response) {
 	if (req.query.getAll === undefined) {
 		// Check if required fields are present.
 		if (!req.query.id) {
-			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+			res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 			return;
 		}
 		prisma.item
@@ -33,12 +34,12 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'it seems that there is no item present' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Item does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	} else {
 		prisma.item
@@ -62,36 +63,53 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'item does not exist' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Item does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	}
 }
 
 // Create item.
 function post(req: Request, res: Response) {
-	/* 
 	// Check if required fields are present.
 	if (!req.body.name) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
-	// Create storageLocation with existing storageUnit.
-	prisma.storageLocation
+
+	prisma.item
 		.create({
 			data: {
+				SKU: req.body.sku,
+				amount: req.body.ammount,
 				name: req.body.name,
-				storageUnitId: parseInt(req.body.storageUnitId) || undefined
-			},
-			select: {
-				id: true
+				comment: req.body.comment,
+				status: req.body.status, //itemStatus.normal,
+
+				// Relations
+				contactInfoId: req.body.contactInfoId,
+				categoryId: req.body.categoryId,
+				storageLocationId: req.body.storageLocationId,
+
+				manufacturer: req.body.manufacturer,
+
+				//contents: {
+				//	connect: [{ id: 1 }, { id: 2 }, { id: 3 }]
+				//},
+				//baseItem: {
+				//	connect: {
+				//		id: req.body.baseitemId
+				//	}
+				//},
+				createdBy: req.body.createdBy
 			}
 		})
 		.then((data) => {
+			// TODO: Check if id is returned correctly
 			res.status(201).json({ status: 'created', id: data.id });
 		})
 		.catch((err) => {
@@ -99,25 +117,26 @@ function post(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'storageLocation already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'storageLocation already exists' });
 			} else if (err.code == 'P2003') {
 				// P2003 -> "Foreign key constraint failed on the field: {field_name}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(404).json({ error: 'specified storageUnitId does not exist' });
+				// FIXME: Is this errormessage right?
+				res.status(404).json({ errorcode: 'NOT_EXISTING', error: 'specified storageUnitId does not exist' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
-*/
 }
 
 // Update storageLocation. -> Only existing contactInfo.
 async function patch(req: Request, res: Response) {
-	/* 
+	res.status(501).json({ errorcode: 'NOT_IMPLEMENTED', error: 'This endpoint is not yet implemented' });
+	/*
 	// Check if required fields are present.
 	if (!req.body.id || !req.body.name || !req.body.storageUnitId) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -130,12 +149,12 @@ async function patch(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(404).json({ error: 'storageLocation does not exist.' });
+				res.status(404).json({ errorcode: 'NOT_EXISTING', error: 'specified storageUnitId does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.storageLocation
@@ -156,14 +175,14 @@ async function patch(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'storageLocation already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'storageLocation already exists' });
 			} else if (err.code == 'P2003') {
 				// P2003 -> "Foreign key constraint failed on the field: {field_name}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
 				res.status(404).json({ error: 'specified storageUnitId does not exist' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 */
@@ -173,7 +192,7 @@ async function patch(req: Request, res: Response) {
 async function del(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -186,12 +205,12 @@ async function del(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'item does not exist' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'Item does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.item
@@ -201,11 +220,11 @@ async function del(req: Request, res: Response) {
 			}
 		})
 		.then(() => {
-			res.status(200).json({ status: 'deleted' });
+			res.status(200).json({ errorcode: 'DELETED', error: 'Sucessfully deleted entry' });
 		})
 		.catch((err) => {
 			log.db.error(err);
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 		});
 }
 
diff --git a/src/routes/api/v1/storageLocations.ts b/src/routes/api/v1/storageLocations.ts
index 8cb356f..0299f54 100644
--- a/src/routes/api/v1/storageLocations.ts
+++ b/src/routes/api/v1/storageLocations.ts
@@ -6,7 +6,7 @@ function get(req: Request, res: Response) {
 	if (req.query.getAll === undefined) {
 		// Check if required fields are present.
 		if (!req.query.id) {
-			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+			res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 			return;
 		}
 		prisma.storageLocation
@@ -23,12 +23,12 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'it seems that there is no storageLocation present.' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageLocation does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	} else {
 		prisma.storageLocation
@@ -42,12 +42,12 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'storageLocation does not exist.' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageLocation does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	}
 }
@@ -56,7 +56,7 @@ function get(req: Request, res: Response) {
 function post(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.name) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 	// Create storageLocation with existing storageUnit.
@@ -78,14 +78,15 @@ function post(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'storageLocation already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'storageLocation already exists' });
 			} else if (err.code == 'P2003') {
 				// P2003 -> "Foreign key constraint failed on the field: {field_name}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
+				// FIXME: Is this errormessage right?
 				res.status(404).json({ error: 'specified storageUnitId does not exist' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 }
@@ -94,7 +95,7 @@ function post(req: Request, res: Response) {
 async function patch(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id || !req.body.name || !req.body.storageUnitId) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -112,7 +113,7 @@ async function patch(req: Request, res: Response) {
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.storageLocation
@@ -133,14 +134,15 @@ async function patch(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'storageLocation already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'storageLocation already exists' });
 			} else if (err.code == 'P2003') {
 				// P2003 -> "Foreign key constraint failed on the field: {field_name}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
+				// FIXME: Is this errormessage right?
 				res.status(404).json({ error: 'specified storageUnitId does not exist' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 }
@@ -149,7 +151,7 @@ async function patch(req: Request, res: Response) {
 async function del(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -162,12 +164,12 @@ async function del(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'storageLocation does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageLocation does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.storageLocation
@@ -177,11 +179,11 @@ async function del(req: Request, res: Response) {
 			}
 		})
 		.then(() => {
-			res.status(200).json({ status: 'deleted' });
+			res.status(200).json({ errorcode: 'DELETED', error: 'Sucessfully deleted entry' });
 		})
 		.catch((err) => {
 			log.db.error(err);
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 		});
 }
 
diff --git a/src/routes/api/v1/storageUnits.ts b/src/routes/api/v1/storageUnits.ts
index 054ad74..fc0b244 100644
--- a/src/routes/api/v1/storageUnits.ts
+++ b/src/routes/api/v1/storageUnits.ts
@@ -7,7 +7,7 @@ function get(req: Request, res: Response) {
 	if (req.query.getAll === undefined) {
 		// Check if required fields are present.
 		if (!req.query.id) {
-			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+			res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 			return;
 		}
 		prisma.storageUnit
@@ -25,12 +25,12 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'it seems that there is no storageUnit present.' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageUnit does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	} else {
 		prisma.storageUnit
@@ -45,12 +45,12 @@ function get(req: Request, res: Response) {
 				if (items) {
 					res.status(200).json(JSON.stringify(items));
 				} else {
-					res.status(410).json({ error: 'storageUnit does not exist.' });
+					res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageUnit does not exist' });
 				}
 			})
 			.catch((err) => {
 				console.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			});
 	}
 }
@@ -61,7 +61,7 @@ function post(req: Request, res: Response) {
 	if (req.body.locationId === 'META_CREATENEW') {
 		// Check if required fields are present.
 		if (!req.body.street || !req.body.houseNumber || !req.body.zipCode || !req.body.city || !req.body.country || !req.body.name) {
-			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+			res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 			return;
 		}
 
@@ -93,16 +93,16 @@ function post(req: Request, res: Response) {
 				if (err.code === 'P2002') {
 					// P2002 -> "Unique constraint failed on the {constraint}"
 					// https://www.prisma.io/docs/reference/api-reference/error-reference
-					res.status(409).json({ error: 'storageUnit already exists.' });
+					res.status(409).json({ errorcode: 'EXISTING', error: 'storageUnit already exists' });
 				} else {
 					log.db.error(err);
-					res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+					res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 				}
 			});
 	} else {
 		// Check if required fields are present.
 		if (!req.body.name || !req.body.locationId) {
-			res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+			res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 			return;
 		}
 		// Create storageUnit with existing location.
@@ -128,10 +128,10 @@ function post(req: Request, res: Response) {
 				if (err.code === 'P2002') {
 					// P2002 -> "Unique constraint failed on the {constraint}"
 					// https://www.prisma.io/docs/reference/api-reference/error-reference
-					res.status(409).json({ error: 'storageUnit already exists.' });
+					res.status(409).json({ errorcode: 'EXISTING', error: 'storageUnit already exists' });
 				} else {
 					log.db.error(err);
-					res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+					res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 				}
 			});
 	}
@@ -141,7 +141,7 @@ function post(req: Request, res: Response) {
 async function patch(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id || !req.body.name || !req.body.locationId) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -154,12 +154,12 @@ async function patch(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'storageUnit does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageUnit does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	// Check if the locationId(contactInfo) exists. If not return 410 Gone.
@@ -171,12 +171,12 @@ async function patch(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'locationId does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'locationId does not exist' });
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.storageUnit
@@ -201,10 +201,10 @@ async function patch(req: Request, res: Response) {
 			if (err.code === 'P2002') {
 				// P2002 -> "Unique constraint failed on the {constraint}"
 				// https://www.prisma.io/docs/reference/api-reference/error-reference
-				res.status(409).json({ error: 'storageUnit already exists.' });
+				res.status(409).json({ errorcode: 'EXISTING', error: 'storageUnit already exists' });
 			} else {
 				log.db.error(err);
-				res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+				res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 			}
 		});
 }
@@ -213,7 +213,7 @@ async function patch(req: Request, res: Response) {
 async function del(req: Request, res: Response) {
 	// Check if required fields are present.
 	if (!req.body.id) {
-		res.status(400).render(__path + '/src/frontend/errors/400.eta.html');
+		res.status(400).json({ errorcode: 'VALIDATION_ERROR', error: 'One or more required fields are missing' });
 		return;
 	}
 
@@ -226,12 +226,13 @@ async function del(req: Request, res: Response) {
 		});
 
 		if (result === null) {
-			res.status(410).json({ error: 'storageUnit does not exist.' });
+			res.status(410).json({ errorcode: 'NOT_EXISTING', error: 'storageUnit does not exist' });
+
 			return;
 		}
 	} catch (err) {
 		log.db.error(err);
-		res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+		res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 	}
 
 	prisma.storageUnit
@@ -241,11 +242,11 @@ async function del(req: Request, res: Response) {
 			}
 		})
 		.then(() => {
-			res.status(200).json({ status: 'deleted' });
+			res.status(200).json({ errorcode: 'DELETED', error: 'Sucessfully deleted entry' });
 		})
 		.catch((err) => {
 			log.db.error(err);
-			res.status(500).render(__path + '/src/frontend/errors/dbError.eta.html', { error: err });
+			res.status(500).json({ errorcode: 'DB_ERROR', error: err });
 		});
 }