diff --git a/.gitignore b/.gitignore
index 03b1925..479883d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@
 **/node_modules
 **/public/build
 **/dist
+
+!.prettierrc.json
\ No newline at end of file
diff --git a/api/.prettierrc.json b/api/.prettierrc.json
new file mode 100644
index 0000000..aea847c
--- /dev/null
+++ b/api/.prettierrc.json
@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": true
+}
diff --git a/api/src/app.ts b/api/src/app.ts
index b857f14..4bac630 100644
--- a/api/src/app.ts
+++ b/api/src/app.ts
@@ -4,15 +4,18 @@ import ip from 'ip';
 
 const PORT = 8000;
 const MONGOURI = 'mongodb://localhost:27017';
+const DBNAME = 'dev';
 
 const mongo = new Mongo(MONGOURI);
 
 const services: Services = {
-  db: mongo.getDb(),
+  db: mongo.getDb(DBNAME),
 };
 
 const server = new Server(services);
 
 server.start(PORT, () =>
-  console.log(`Running on http://${ip.address()}:${PORT}`),
+  console.log(
+    `Running on http://127.0.0.1:${PORT} http://${ip.address()}:${PORT}`,
+  ),
 );
diff --git a/api/src/entities/entity.ts b/api/src/entities/entity.ts
new file mode 100644
index 0000000..6797d12
--- /dev/null
+++ b/api/src/entities/entity.ts
@@ -0,0 +1,14 @@
+import { EntityCtor, EntityInfo } from '@core';
+import { randomUUID } from 'crypto';
+
+export class Entity implements EntityInfo {
+  uuid: string;
+  createdAt: Date;
+  updatedAt: Date;
+
+  constructor(raw: EntityCtor) {
+    this.uuid = raw.uuid || randomUUID();
+    this.createdAt = raw.createdAt || new Date();
+    this.updatedAt = raw.updatedAt || new Date();
+  }
+}
diff --git a/api/src/entities/user.ts b/api/src/entities/user.ts
new file mode 100644
index 0000000..3e6517d
--- /dev/null
+++ b/api/src/entities/user.ts
@@ -0,0 +1,18 @@
+import { UserCtor, UserInfo } from '@core';
+import { Entity } from './entity';
+
+export class User extends Entity implements UserInfo {
+  name: string;
+
+  constructor(raw: UserCtor) {
+    super(raw);
+
+    this.name = raw.name ? raw.name : '';
+  }
+
+  Info(): UserInfo {
+    return {
+      name: this.name,
+    };
+  }
+}
diff --git a/api/src/framework/express/middleware.ts b/api/src/framework/express/middleware.ts
index e15f87c..3bc9f66 100644
--- a/api/src/framework/express/middleware.ts
+++ b/api/src/framework/express/middleware.ts
@@ -1,6 +1,10 @@
-import { RequestHandler } from 'express';
+import { Request, RequestHandler } from 'express';
 import { randomUUID } from 'crypto';
 
+export function getId(req: Request): string {
+  return req.get('request-id') || 'unknown';
+}
+
 export function BeforeEach(): RequestHandler {
   return (req, res, next) => {
     req.headers['request-id'] = randomUUID();
diff --git a/api/src/framework/express/user.ts b/api/src/framework/express/user.ts
index 6d120a4..7b3bde3 100644
--- a/api/src/framework/express/user.ts
+++ b/api/src/framework/express/user.ts
@@ -1,5 +1,6 @@
 import { RequestHandler, Router } from 'express';
 import { Create } from '../../functions/user';
+import { getId } from './middleware';
 import { Services } from './server';
 
 export function LoginHandler(services: Services): RequestHandler {
@@ -12,7 +13,7 @@ export function CreateHandler(services: Services): RequestHandler {
   const createUser = Create(services);
 
   return async (req, res) => {
-    const user = await createUser(req.get('request-id'), req.body);
+    const user = await createUser(getId(req), req.body);
 
     res.send(user);
   };
diff --git a/api/src/framework/mongo/mongo.ts b/api/src/framework/mongo/mongo.ts
index 753c780..61feecf 100644
--- a/api/src/framework/mongo/mongo.ts
+++ b/api/src/framework/mongo/mongo.ts
@@ -2,14 +2,13 @@ import { MongoClient, Db } from 'mongodb';
 
 class Mongo {
   private client: MongoClient;
-  private dbName: string;
 
   constructor(uri: string) {
     this.client = new MongoClient(uri);
   }
 
-  getDb(): Db {
-    return this.client.db(this.dbName);
+  getDb(dbName: string): Db {
+    return this.client.db(dbName);
   }
 }
 
diff --git a/api/src/framework/mongo/user.ts b/api/src/framework/mongo/user.ts
index 423d102..3c968cb 100644
--- a/api/src/framework/mongo/user.ts
+++ b/api/src/framework/mongo/user.ts
@@ -1,16 +1,28 @@
-import { CreateUserBody, User, UserInfo } from '@core';
+import { User } from '../../entities/user';
 import { Services } from '../express/server';
 
 export function Create(
   services: Services,
-): (tracker: string, user: CreateUserBody) => Promise<UserInfo> {
+): (tracker: string, user: User) => Promise<User> {
   const { db } = services;
-  const coll = db.collection('users');
+  const coll = db.collection<User>('users');
+  const readUser = Read(services);
 
   return async (tracker, user) => {
     await coll.insertOne(user);
-    return {
-      name: 'test',
-    };
+    return readUser(tracker, user.uuid);
+  };
+}
+
+export function Read(
+  services: Services,
+): (tracker: string, uuid: string) => Promise<User> {
+  const { db } = services;
+  const coll = db.collection<User>('users');
+
+  return async (tracker, uuid) => {
+    const user = await coll.findOne({ uuid });
+
+    return new User(user || { name: 'not found' });
   };
 }
diff --git a/api/src/functions/user.ts b/api/src/functions/user.ts
index b993da2..4184bdb 100644
--- a/api/src/functions/user.ts
+++ b/api/src/functions/user.ts
@@ -1,13 +1,15 @@
 import { CreateUserBody, UserInfo } from '@core';
+import { User } from '../entities/user';
 import { Services } from '../framework/express/server';
 import * as mongo from '../framework/mongo/user';
 
 export function Create(
   services: Services,
-): (tracker: string, user: CreateUserBody) => Promise<UserInfo> {
+): (tracker: string, raw: CreateUserBody) => Promise<UserInfo> {
   const createUser = mongo.Create(services);
 
-  return async (tracker, user) => {
-    return createUser(tracker, user);
+  return async (tracker, raw) => {
+    const user = await createUser(tracker, new User(raw));
+    return user.Info();
   };
 }
diff --git a/api/tsconfig.json b/api/tsconfig.json
index a4626de..d5029f7 100644
--- a/api/tsconfig.json
+++ b/api/tsconfig.json
@@ -6,6 +6,7 @@
     "moduleResolution": "node",
     "outDir": "dist",
     "sourceMap": false,
+    "strictNullChecks": true,
     "paths": {
       "@core": ["../core/src"]
     }
diff --git a/core/.prettierrc.json b/core/.prettierrc.json
new file mode 100644
index 0000000..aea847c
--- /dev/null
+++ b/core/.prettierrc.json
@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": true
+}
diff --git a/core/src/entity.ts b/core/src/entity.ts
index 4801168..a0842e3 100644
--- a/core/src/entity.ts
+++ b/core/src/entity.ts
@@ -1,5 +1,7 @@
-export type Entity = {
+export type EntityInfo = {
   uuid: string;
   createdAt: Date;
   updatedAt: Date;
 };
+
+export type EntityCtor = Partial<EntityInfo>;
diff --git a/core/src/index.ts b/core/src/index.ts
index 21bc12d..260ce72 100644
--- a/core/src/index.ts
+++ b/core/src/index.ts
@@ -1,2 +1,2 @@
-export * from "./user";
-export * from "./entity";
+export * from './user';
+export * from './entity';
diff --git a/core/src/user.ts b/core/src/user.ts
index c430226..3e42771 100644
--- a/core/src/user.ts
+++ b/core/src/user.ts
@@ -1,10 +1,10 @@
-import { Entity } from "./entity";
+import { EntityInfo } from './entity';
 
 export type UserInfo = {
   name: string;
 };
 
-export type User = UserInfo & Entity;
+export type User = UserInfo & EntityInfo;
 
 export type CreateUserBody = {
   name: string;
@@ -12,3 +12,5 @@ export type CreateUserBody = {
 };
 
 export type LoginUserBody = CreateUserBody;
+
+export type UserCtor = Partial<User>;
diff --git a/core/tsconfig.json b/core/tsconfig.json
index 0d8fc9f..bdc7461 100644
--- a/core/tsconfig.json
+++ b/core/tsconfig.json
@@ -4,6 +4,7 @@
     "declarationMap": true,
     "composite": true,
     "sourceMap": false,
+    "strictNullChecks": true,
     "outDir": "dist"
   },
   "include": ["src/**/*"],
diff --git a/prettier.py b/prettier.py
new file mode 100755
index 0000000..c479420
--- /dev/null
+++ b/prettier.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+import os
+
+for dir in os.listdir('.'):
+    if os.path.isdir(dir) and not dir.startswith('.'):
+        os.chdir(dir)
+        os.system('npm run prettier')
+        os.chdir('..')
diff --git a/www/.prettierrc.json b/www/.prettierrc.json
new file mode 100644
index 0000000..aea847c
--- /dev/null
+++ b/www/.prettierrc.json
@@ -0,0 +1,5 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": true
+}
diff --git a/www/tsconfig.json b/www/tsconfig.json
index b6fa30d..d8473f3 100644
--- a/www/tsconfig.json
+++ b/www/tsconfig.json
@@ -2,6 +2,7 @@
   "extends": "@tsconfig/svelte/tsconfig.json",
   "compilerOptions": {
     "sourceMap": false,
+    "strictNullChecks": true,
     "paths": {
       "@core": ["../core/src"]
     }