diff --git a/server/jest.config.ts b/server/jest.config.ts
new file mode 100644
index 0000000000000000000000000000000000000000..53d87521050ddc677ddb885b6ed16334d50467ff
--- /dev/null
+++ b/server/jest.config.ts
@@ -0,0 +1,197 @@
+/*
+ * For a detailed explanation regarding each configuration property and type check, visit:
+ * https://jestjs.io/docs/en/configuration.html
+ */
+
+export default {
+  // All imported modules in your tests should be mocked automatically
+  // automock: false,
+
+  // Stop running tests after `n` failures
+  // bail: 0,
+
+  // The directory where Jest should store its cached dependency information
+  // cacheDirectory: "C:\\Users\\phucj\\AppData\\Local\\Temp\\jest",
+
+  // Automatically clear mock calls and instances between every test
+  clearMocks: true,
+
+  // Indicates whether the coverage information should be collected while executing the test
+  // collectCoverage: false,
+
+  // An array of glob patterns indicating a set of files for which coverage information should be collected
+  // collectCoverageFrom: undefined,
+
+  // The directory where Jest should output its coverage files
+  coverageDirectory: "coverage",
+
+  // An array of regexp pattern strings used to skip coverage collection
+  // coveragePathIgnorePatterns: [
+  //   "\\\\node_modules\\\\"
+  // ],
+
+  // Indicates which provider should be used to instrument code for coverage
+  // coverageProvider: "babel",
+
+  // A list of reporter names that Jest uses when writing coverage reports
+  // coverageReporters: [
+  //   "json",
+  //   "text",
+  //   "lcov",
+  //   "clover"
+  // ],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  // coverageThreshold: undefined,
+
+  // A path to a custom dependency extractor
+  // dependencyExtractor: undefined,
+
+  // Make calling deprecated APIs throw helpful error messages
+  // errorOnDeprecated: false,
+
+  // Force coverage collection from ignored files using an array of glob patterns
+  // forceCoverageMatch: [],
+
+  // A path to a module which exports an async function that is triggered once before all test suites
+  // globalSetup: undefined,
+
+  // A path to a module which exports an async function that is triggered once after all test suites
+  // globalTeardown: undefined,
+
+  // A set of global variables that need to be available in all test environments
+  // globals: {},
+
+  // The maximum amount of workers used to run your tests. Can be specified as % or a number. E.g. maxWorkers: 10% will use 10% of your CPU amount + 1 as the maximum worker number. maxWorkers: 2 will use a maximum of 2 workers.
+  // maxWorkers: "50%",
+
+  // An array of directory names to be searched recursively up from the requiring module's location
+  // moduleDirectories: [
+  //   "node_modules"
+  // ],
+
+  // An array of file extensions your modules use
+  // moduleFileExtensions: [
+  //   "js",
+  //   "json",
+  //   "jsx",
+  //   "ts",
+  //   "tsx",
+  //   "node"
+  // ],
+  moduleFileExtensions: ['js', 'jsx', 'ts', 'tsx', 'json'],
+
+  // A map from regular expressions to module names or to arrays of module names that allow to stub out resources with a single module
+  // moduleNameMapper: {},
+
+  // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader
+  // modulePathIgnorePatterns: [],
+
+  // Activates notifications for test results
+  // notify: false,
+
+  // An enum that specifies notification mode. Requires { notify: true }
+  // notifyMode: "failure-change",
+
+  // A preset that is used as a base for Jest's configuration
+  // preset: undefined,
+
+  // Run tests from one or more projects
+  // projects: undefined,
+
+  // Use this configuration option to add custom reporters to Jest
+  // reporters: undefined,
+
+  // Automatically reset mock state between every test
+  // resetMocks: false,
+
+  // Reset the module registry before running each individual test
+  // resetModules: false,
+
+  // A path to a custom resolver
+  // resolver: undefined,
+
+  // Automatically restore mock state between every test
+  // restoreMocks: false,
+
+  // The root directory that Jest should scan for tests and modules within
+  // rootDir: undefined,
+
+  // A list of paths to directories that Jest should use to search for files in
+  // roots: [
+  //   "<rootDir>"
+  // ],
+
+  // Allows you to use a custom runner instead of Jest's default test runner
+  // runner: "jest-runner",
+
+  // The paths to modules that run some code to configure or set up the testing environment before each test
+  // setupFiles: [],
+
+  // A list of paths to modules that run some code to configure or set up the testing framework before each test
+  // setupFilesAfterEnv: [],
+
+  // The number of seconds after which a test is considered as slow and reported as such in the results.
+  // slowTestThreshold: 5,
+
+  // A list of paths to snapshot serializer modules Jest should use for snapshot testing
+  // snapshotSerializers: [],
+
+  // The test environment that will be used for testing
+  testEnvironment: "node",
+
+  // Options that will be passed to the testEnvironment
+  // testEnvironmentOptions: {},
+
+  // Adds a location field to test results
+  // testLocationInResults: false,
+
+  // The glob patterns Jest uses to detect test files
+  // testMatch: [
+  //   "**/__tests__/**/*.[jt]s?(x)",
+  //   "**/?(*.)+(spec|test).[tj]s?(x)"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
+  // testPathIgnorePatterns: [
+  //   "\\\\node_modules\\\\"
+  // ],
+
+  // The regexp pattern or array of patterns that Jest uses to detect test files
+  // testRegex: [],
+
+  // This option allows the use of a custom results processor
+  // testResultsProcessor: undefined,
+
+  // This option allows use of a custom test runner
+  // testRunner: "jasmine2",
+
+  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
+  // testURL: "http://localhost",
+
+  // Setting this value to "fake" allows the use of fake timers for functions such as "setTimeout"
+  // timers: "real",
+
+  // A map from regular expressions to paths to transformers
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  },
+
+  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
+  // transformIgnorePatterns: [
+  //   "\\\\node_modules\\\\",
+  //   "\\.pnp\\.[^\\\\]+$"
+  // ],
+
+  // An array of regexp pattern strings that are matched against all modules before the module loader will automatically return a mock for them
+  // unmockedModulePathPatterns: undefined,
+
+  // Indicates whether each individual test should be reported during the run
+  // verbose: undefined,
+
+  // An array of regexp patterns that are matched against all source file paths before re-running tests in watch mode
+  // watchPathIgnorePatterns: [],
+
+  // Whether to use watchman for file crawling
+  // watchman: true,
+};
diff --git a/server/package.json b/server/package.json
index d3e68d2c3d4ec28b509b1549a945dcc45fbe6ab5..ddee43554ba1ad65283c4c99422e5e6a4cc92e65 100644
--- a/server/package.json
+++ b/server/package.json
@@ -5,19 +5,24 @@
   "main": "src/index.ts",
   "scripts": {
     "start": "nodemon --watch 'src/**/*.ts' --exec \"ts-node\" src/index.ts",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "author": "",
   "license": "ISC",
   "dependencies": {
     "@types/cors": "^2.8.9",
     "@types/express": "^4.17.11",
+    "@types/jest": "^26.0.20",
     "@types/mysql": "^2.15.17",
+    "@types/supertest": "^2.0.10",
     "body-parser": "^1.19.0",
     "cors": "^2.8.5",
     "express": "^4.17.1",
+    "jest": "^26.6.3",
     "mysql": "^2.18.1",
-    "mysql2": "^2.2.5"
+    "mysql2": "^2.2.5",
+    "supertest": "^6.1.3",
+    "ts-jest": "^26.5.1"
   },
   "devDependencies": {
     "nodemon": "^2.0.7",
diff --git a/server/src/app.ts b/server/src/app.ts
new file mode 100644
index 0000000000000000000000000000000000000000..366a65553d7703169d63f10d608cff484411bc2a
--- /dev/null
+++ b/server/src/app.ts
@@ -0,0 +1,19 @@
+import express, { Application } from 'express';
+import routes from "./routes/routes";
+import bodyParser from 'body-parser';
+import cors from 'cors';
+import mysql from 'mysql2';
+// Boot express
+const app: Application = express();
+
+app.use(cors());
+// Configuring body parser middleware
+app.use(bodyParser.urlencoded({ extended: false }));
+app.use(bodyParser.json());
+
+// Configuring json response
+app.set("json spaces", 2);
+
+app.use("/api", routes);
+
+export default app;
\ No newline at end of file
diff --git a/server/src/controllers/categoryController/index.ts b/server/src/controllers/categoryController/index.ts
new file mode 100644
index 0000000000000000000000000000000000000000..6d9d91a1d812ac99c00af092a9ed2928a80d678f
--- /dev/null
+++ b/server/src/controllers/categoryController/index.ts
@@ -0,0 +1,65 @@
+import { Response, Request } from "express";
+import query from '../../services/db_query';
+import express from 'express';
+import Category from '../../models/category';
+
+const router = express.Router();
+const category = new Category();
+// routes Kategori
+// - hente alle kategorier (get)
+// SELECT * FROM category;
+// - hente et bestemt kategori (get)
+// SELECT * FROM category WHERE categoryid = #num;
+// - remove specific cateogry (post)
+// INSERT INTO `jonnynl_tdt4140`.`category` (`categoryid`, `navn`) VALUES ('4', 'ad');
+// - add category (post)
+// DELETE FROM `jonnynl_tdt4140`.`category` WHERE (`categoryid` = '3');
+
+/* ============================= CREATE ============================= */
+// Create category `/api/category/`
+router.route('/').post(async (request: Request, response: Response) => {
+	const {category} = request.body;
+	try {
+		const input = (` INSERT INTO category(navn) VALUES (?);`)
+		return response.status(200).json(
+            await query(input,[category])
+        );
+	} catch (error) {
+		return response.status(400).send("Bad Request");
+	}
+});
+
+/* ============================= READ ============================= */
+// Get category `/api/category/`
+router.route('/').get(async (_: Request, response: Response) => {
+	try {
+		response.status(200).json(await query("SELECT * FROM category;",""));
+	} catch (error) {
+		response.status(400).send("Bad Request");
+	}
+});
+
+// Get category from id `/api/category/:categoryid`
+router.route('/:categoryid').get(async (request: Request, response: Response) => {
+    const categoryid = request.params.categoryid;
+	try {
+		response.status(200).json(await query("SELECT * FROM category WHERE categoryid = ?",[categoryid]));
+	} catch (error) {
+		response.status(400).send("Bad Request");
+	}
+});
+
+/* ============================= UPDATE ============================= */
+
+/* ============================= DELETE ============================= */
+// remove category with id `/api/category/#categoryid`
+router.route('/').delete(async (request: Request, response: Response) => {
+    const categoryid = request.params.categoryid;
+	try {
+		response.status(200).json(await query("DELETE FROM category WHERE categoryid = ?",[categoryid]));
+	} catch (error) {
+		response.status(400).send("Bad Request");
+	}
+});
+
+export default router;
\ No newline at end of file
diff --git a/server/src/controllers/categoryController/tests/categoryController.test.ts b/server/src/controllers/categoryController/tests/categoryController.test.ts
new file mode 100644
index 0000000000000000000000000000000000000000..a0283e72cfa8e64a2d2820393b0f34a249143e72
--- /dev/null
+++ b/server/src/controllers/categoryController/tests/categoryController.test.ts
@@ -0,0 +1,25 @@
+import request from 'supertest';
+import app from '../../../app';
+
+describe('Test categoryController', () => {
+    beforeAll(async () => {
+        console.log("Test starting...");
+    });
+
+    afterAll(async () => {
+        console.log("...Test ending");
+    });
+
+    it('Request /api/category should return request of 200!', async () => {
+        const result = await request(app).get('/api/category').send();
+
+        expect(result.status).toBe(200);
+    });
+
+    it('Request /api/category/1 should return data with name "Antikviteter og Kunst"!', async () => {
+        const result = await request(app).get('/api/category/1').send();
+
+        expect(result.status).toBe(200);
+        expect(result.body.data[0]?.navn).toBe('Antikviteter og Kunst');
+    });
+});
\ No newline at end of file
diff --git a/server/src/controllers/postController.ts b/server/src/controllers/postcontroller/index.ts
similarity index 69%
rename from server/src/controllers/postController.ts
rename to server/src/controllers/postcontroller/index.ts
index 5651ca2fbda93670b3ed4de90206eb7a572e20f7..c437f2c608dd9d3087ecc1099a3544a4585f5a7b 100644
--- a/server/src/controllers/postController.ts
+++ b/server/src/controllers/postcontroller/index.ts
@@ -1,32 +1,28 @@
 import { Response, Request } from "express";
-import query from '../services/db_query';
+import query from '../../services/db_query';
 import express from 'express';
+import IPost from '../../models/post';
+import Category from '../../models/category';
+
 const router = express.Router();
+const category = new Category();
 
-interface IPost {
-	title: string;
-	description: string;
-	timestamp: number;
-	owner: string;
-	categoryid: number;
-	imageUrl: string;
-}
 /* ============================= CREATE ============================= */
 // Create posts `/api/post/`
 //'{"title":"test3","description":"test3","timestamp":123123,"owner":"test3","category":"test3","imageUrl":"test3"}'
 router.route('/').post(async (request: Request, response: Response) => {
-	const {title, description, timestamp, owner, categoryid, imageUrl} = request.body;
+	const {title, description, timestamp, owner, category, imageUrl} = request.body;
 	try {
 		const post: IPost = {
 			"title": title,
 			"description": description,
 			"timestamp": timestamp,
 			"owner": owner,
-			"categoryid": categoryid,
+			"category": category,
 			"imageUrl": imageUrl
 		};
 		if (Object.values(post).filter(p => p == undefined).length > 0) return response.status(500).send("Error");
-		const input = (`INSERT INTO post(title, description, timestamp, owner, categoryid, imageUrl) VALUES (?,?,?,?,?,?)`)
+		const input = (`INSERT INTO post(title, description, timestamp, owner, category, imageUrl) VALUES (?,?,?,?,?,?)`)
 		return response.status(200).json(
 			await query(input,Object.values(post))
 		);
@@ -39,7 +35,11 @@ router.route('/').post(async (request: Request, response: Response) => {
 // Get all posts `/api/post/`
 router.route('/').get(async (_: Request, response: Response) => {
 	try {
-		response.status(200).json(await query("SELECT * FROM post;",""));
+		//response.status(200).json(await query("SELECT * FROM post;",""));
+		const input = `SELECT p.id, p.title, p.description, p.timestamp, p.owner, category.navn, p.imageUrl 
+		FROM post as p
+		INNER JOIN category ON category.categoryid = p.categoryid;`
+		response.status(200).json(await query(input,""));
 	} catch (error) {
 		response.status(400).send("Bad Request");
 	}
@@ -49,7 +49,11 @@ router.route('/').get(async (_: Request, response: Response) => {
 router.route('/:id').get(async (request: Request, response: Response) => {
 	const postId = request.params.id;
 	try {
-		response.status(200).json(await query("SELECT * FROM post WHERE id=?;",[postId]));
+		//response.status(200).json(await query("SELECT * FROM post WHERE id=?;",[postId]));
+		const input = `SELECT p.id, p.title, p.description, p.timestamp, p.owner, category.navn, p.imageUrl 
+		FROM post as p
+		INNER JOIN category ON category.categoryid = p.categoryid WHERE p.id=?;`
+		response.status(200).json(await query(input,[postId]));
 	} catch (error) {
 		response.status(400).send("Bad Request");
 	}
diff --git a/server/src/index.ts b/server/src/index.ts
index 8d875a0e68cc187dc3a09d3cdc5de1ad52772847..d4b49774f337ac7b92acab230b4e8fe2970b442e 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -1,23 +1,8 @@
-import bodyParser from 'body-parser';
-import cors from 'cors';
-import express from 'express';
-import routes from './routes/routes';
-import mysql from 'mysql2';
+import app from './app';
 
 // REST API config
-const app = express();
 const port = 3000;
 
-app.use(cors());
-// Configuring body parser middleware
-app.use(bodyParser.urlencoded({ extended: false }));
-app.use(bodyParser.json());
-
-// Configuring json response
-app.set("json spaces", 2);
-
-app.use("/api", routes);
-
 app.listen(port, () => {
 	console.log(`Listening on port ${port}!`)
-});
+});
\ No newline at end of file
diff --git a/server/src/models/category.ts b/server/src/models/category.ts
new file mode 100644
index 0000000000000000000000000000000000000000..be930c47a7b34d318dc14240ab7ffcb3534039ea
--- /dev/null
+++ b/server/src/models/category.ts
@@ -0,0 +1,26 @@
+class Category {
+    private list: string[] = [
+        
+    ]
+
+    // add a category to the category list
+    addToList(category: string) {
+        this.list.push(category);
+    }
+    
+    // remove a category from the category list
+    removeFromList(category: string) {
+        try {
+            delete this.list[this.list.indexOf(category)];
+        } catch(e) {
+            throw new Error("Couldnt delete category");
+        }
+    }
+
+    // return the list of categories.
+    getList() {
+        return this.list;
+    }
+}
+
+export default Category;
\ No newline at end of file
diff --git a/server/src/models/post.ts b/server/src/models/post.ts
new file mode 100644
index 0000000000000000000000000000000000000000..146bf71067332d191d975514b24837200d3d3706
--- /dev/null
+++ b/server/src/models/post.ts
@@ -0,0 +1,12 @@
+// Post modell, med typene:
+interface IPost {
+	title: string;
+	description: string;
+	timestamp: number;
+	owner: string;
+	category: string;
+	imageUrl: string;
+}
+
+// Eksporterer IPost til bruk i andre filer.
+export default IPost;
\ No newline at end of file
diff --git a/server/src/routes/routes.ts b/server/src/routes/routes.ts
index 49efb2c37e47305c88c0a75208a7f526e2746528..aec88f548f1ea10d2c42f362a6d057ba586f0fdd 100644
--- a/server/src/routes/routes.ts
+++ b/server/src/routes/routes.ts
@@ -1,11 +1,12 @@
-//import { example1, example2 } from '../controllers/example';
-import postController from '../controllers/postController'
+import postController from '../controllers/postcontroller';
+import categoryController from '../controllers/categoryController';
 import express from 'express';
 
 const router = express.Router();
 
 // Endpoints
-router.use("/post", postController); 
+router.use("/post", postController);
+router.use("/category", categoryController);
 
 
 export default router;