diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9ded935..f3a72b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,31 @@
+## [0.4.1](https://github.com/sasjs/server/compare/v0.4.0...v0.4.1) (2022-06-15)
+
+
+### Bug Fixes
+
+* add/remove group to User when adding/removing user from group and return group membership on getting user ([e08bbcc](https://github.com/sasjs/server/commit/e08bbcc5435cbabaee40a41a7fb667d4a1f078e6))
+
+# [0.4.0](https://github.com/sasjs/server/compare/v0.3.10...v0.4.0) (2022-06-14)
+
+
+### Features
+
+* new APIs added for GET|PATCH|DELETE of user by username ([aef411a](https://github.com/sasjs/server/commit/aef411a0eac625c33274dfe3e88b6f75115c44d8))
+
+## [0.3.10](https://github.com/sasjs/server/compare/v0.3.9...v0.3.10) (2022-06-14)
+
+
+### Bug Fixes
+
+* correct syntax for encoding option ([32d372b](https://github.com/sasjs/server/commit/32d372b42fbf56b6c0779e8f704164eaae1c7548))
+
+## [0.3.9](https://github.com/sasjs/server/compare/v0.3.8...v0.3.9) (2022-06-14)
+
+
+### Bug Fixes
+
+* forcing utf 8 encoding. Closes [#76](https://github.com/sasjs/server/issues/76) ([8734489](https://github.com/sasjs/server/commit/8734489cf014aedaca3f325e689493e4fe0b71ca))
+
 ## [0.3.8](https://github.com/sasjs/server/compare/v0.3.7...v0.3.8) (2022-06-13)
 
 
diff --git a/api/public/swagger.yaml b/api/public/swagger.yaml
index 1f76c10..dd34dd8 100644
--- a/api/public/swagger.yaml
+++ b/api/public/swagger.yaml
@@ -310,6 +310,21 @@ components:
                 - displayName
             type: object
             additionalProperties: false
+        GroupResponse:
+            properties:
+                groupId:
+                    type: number
+                    format: double
+                name:
+                    type: string
+                description:
+                    type: string
+            required:
+                - groupId
+                - name
+                - description
+            type: object
+            additionalProperties: false
         UserDetailsResponse:
             properties:
                 id:
@@ -325,6 +340,10 @@ components:
                     type: boolean
                 autoExec:
                     type: string
+                groups:
+                    items:
+                        $ref: '#/components/schemas/GroupResponse'
+                    type: array
             required:
                 - id
                 - displayName
@@ -364,21 +383,6 @@ components:
                 - password
             type: object
             additionalProperties: false
-        GroupResponse:
-            properties:
-                groupId:
-                    type: number
-                    format: double
-                name:
-                    type: string
-                description:
-                    type: string
-            required:
-                - groupId
-                - name
-                - description
-            type: object
-            additionalProperties: false
         GroupDetailsResponse:
             properties:
                 groupId:
@@ -985,6 +989,94 @@ paths:
                     application/json:
                         schema:
                             $ref: '#/components/schemas/UserPayload'
+    '/SASjsApi/user/by/username/{username}':
+        get:
+            operationId: GetUserByUsername
+            responses:
+                '200':
+                    description: Ok
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/UserDetailsResponse'
+            description: 'Only Admin or user itself will get user autoExec code.'
+            summary: 'Get user properties - such as group memberships, userName, displayName.'
+            tags:
+                - User
+            security:
+                -
+                    bearerAuth: []
+            parameters:
+                -
+                    description: 'The User''s username'
+                    in: path
+                    name: username
+                    required: true
+                    schema:
+                        type: string
+                    example: johnSnow01
+        patch:
+            operationId: UpdateUserByUsername
+            responses:
+                '200':
+                    description: Ok
+                    content:
+                        application/json:
+                            schema:
+                                $ref: '#/components/schemas/UserDetailsResponse'
+                            examples:
+                                'Example 1':
+                                    value: {id: 1234, displayName: 'John Snow', username: johnSnow01, isAdmin: false, isActive: true}
+            summary: 'Update user properties - such as displayName. Can be performed either by admins, or the user in question.'
+            tags:
+                - User
+            security:
+                -
+                    bearerAuth: []
+            parameters:
+                -
+                    description: 'The User''s username'
+                    in: path
+                    name: username
+                    required: true
+                    schema:
+                        type: string
+                    example: johnSnow01
+            requestBody:
+                required: true
+                content:
+                    application/json:
+                        schema:
+                            $ref: '#/components/schemas/UserPayload'
+        delete:
+            operationId: DeleteUserByUsername
+            responses:
+                '204':
+                    description: 'No content'
+            summary: 'Delete a user. Can be performed either by admins, or the user in question.'
+            tags:
+                - User
+            security:
+                -
+                    bearerAuth: []
+            parameters:
+                -
+                    description: 'The User''s username'
+                    in: path
+                    name: username
+                    required: true
+                    schema:
+                        type: string
+                    example: johnSnow01
+            requestBody:
+                required: true
+                content:
+                    application/json:
+                        schema:
+                            properties:
+                                password:
+                                    type: string
+                            type: object
     '/SASjsApi/user/{userId}':
         get:
             operationId: GetUser
diff --git a/api/src/controllers/group.ts b/api/src/controllers/group.ts
index 44adef2..b3cbb0f 100644
--- a/api/src/controllers/group.ts
+++ b/api/src/controllers/group.ts
@@ -14,7 +14,7 @@ import Group, { GroupPayload } from '../model/Group'
 import User from '../model/User'
 import { UserResponse } from './user'
 
-interface GroupResponse {
+export interface GroupResponse {
   groupId: number
   name: string
   description: string
@@ -210,6 +210,9 @@ const updateUsersListInGroup = async (
 
   if (!updatedGroup) throw new Error('Unable to update group')
 
+  if (action === 'addUser') user.addGroup(group._id)
+  else user.removeGroup(group._id)
+
   return {
     groupId: updatedGroup.groupId,
     name: updatedGroup.name,
diff --git a/api/src/controllers/internal/Session.ts b/api/src/controllers/internal/Session.ts
index c1d5d40..3f69a95 100644
--- a/api/src/controllers/internal/Session.ts
+++ b/api/src/controllers/internal/Session.ts
@@ -97,6 +97,8 @@ ${autoExecContent}`
       session.path,
       '-AUTOEXEC',
       autoExecPath,
+      '-ENCODING',
+      'UTF-8',
       process.platform === 'win32' ? '-nosplash' : ''
     ])
       .then(() => {
diff --git a/api/src/controllers/user.ts b/api/src/controllers/user.ts
index cfbce9d..cbb3d81 100644
--- a/api/src/controllers/user.ts
+++ b/api/src/controllers/user.ts
@@ -18,6 +18,7 @@ import { desktopUser } from '../middlewares'
 
 import User, { UserPayload } from '../model/User'
 import { getUserAutoExec, updateUserAutoExec, ModeType } from '../utils'
+import { GroupResponse } from './group'
 
 export interface UserResponse {
   id: number
@@ -32,6 +33,7 @@ interface UserDetailsResponse {
   isActive: boolean
   isAdmin: boolean
   autoExec?: string
+  groups?: GroupResponse[]
 }
 
 @Security('bearerAuth')
@@ -77,6 +79,26 @@ export class UserController {
     return createUser(body)
   }
 
+  /**
+   * Only Admin or user itself will get user autoExec code.
+   * @summary Get user properties - such as group memberships, userName, displayName.
+   * @param username The User's username
+   * @example username "johnSnow01"
+   */
+  @Get('by/username/{username}')
+  public async getUserByUsername(
+    @Request() req: express.Request,
+    @Path() username: string
+  ): Promise<UserDetailsResponse> {
+    const { MODE } = process.env
+
+    if (MODE === ModeType.Desktop) return getDesktopAutoExec()
+
+    const { user } = req
+    const getAutoExec = user!.isAdmin || user!.username == username
+    return getUser({ username }, getAutoExec)
+  }
+
   /**
    * Only Admin or user itself will get user autoExec code.
    * @summary Get user properties - such as group memberships, userName, displayName.
@@ -94,7 +116,32 @@ export class UserController {
 
     const { user } = req
     const getAutoExec = user!.isAdmin || user!.userId == userId
-    return getUser(userId, getAutoExec)
+    return getUser({ id: userId }, getAutoExec)
+  }
+
+  /**
+   * @summary Update user properties - such as displayName. Can be performed either by admins, or the user in question.
+   * @param username The User's username
+   * @example username "johnSnow01"
+   */
+  @Example<UserDetailsResponse>({
+    id: 1234,
+    displayName: 'John Snow',
+    username: 'johnSnow01',
+    isAdmin: false,
+    isActive: true
+  })
+  @Patch('by/username/{username}')
+  public async updateUserByUsername(
+    @Path() username: string,
+    @Body() body: UserPayload
+  ): Promise<UserDetailsResponse> {
+    const { MODE } = process.env
+
+    if (MODE === ModeType.Desktop)
+      return updateDesktopAutoExec(body.autoExec ?? '')
+
+    return updateUser({ username }, body)
   }
 
   /**
@@ -119,7 +166,21 @@ export class UserController {
     if (MODE === ModeType.Desktop)
       return updateDesktopAutoExec(body.autoExec ?? '')
 
-    return updateUser(userId, body)
+    return updateUser({ id: userId }, body)
+  }
+
+  /**
+   * @summary Delete a user. Can be performed either by admins, or the user in question.
+   * @param username The User's username
+   * @example username "johnSnow01"
+   */
+  @Delete('by/username/{username}')
+  public async deleteUserByUsername(
+    @Path() username: string,
+    @Body() body: { password?: string },
+    @Query() @Hidden() isAdmin: boolean = false
+  ) {
+    return deleteUser({ username }, isAdmin, body)
   }
 
   /**
@@ -133,7 +194,7 @@ export class UserController {
     @Body() body: { password?: string },
     @Query() @Hidden() isAdmin: boolean = false
   ) {
-    return deleteUser(userId, isAdmin, body)
+    return deleteUser({ id: userId }, isAdmin, body)
   }
 }
 
@@ -174,11 +235,22 @@ const createUser = async (data: UserPayload): Promise<UserDetailsResponse> => {
   }
 }
 
+interface GetUserBy {
+  id?: number
+  username?: string
+}
+
 const getUser = async (
-  id: number,
+  findBy: GetUserBy,
   getAutoExec: boolean
 ): Promise<UserDetailsResponse> => {
-  const user = await User.findOne({ id })
+  const user = (await User.findOne(
+    findBy,
+    `id displayName username isActive isAdmin autoExec -_id`
+  ).populate(
+    'groups',
+    'groupId name description -_id'
+  )) as unknown as UserDetailsResponse
 
   if (!user) throw new Error('User is not found.')
 
@@ -188,7 +260,8 @@ const getUser = async (
     username: user.username,
     isActive: user.isActive,
     isAdmin: user.isAdmin,
-    autoExec: getAutoExec ? user.autoExec ?? '' : undefined
+    autoExec: getAutoExec ? user.autoExec ?? '' : undefined,
+    groups: user.groups
   }
 }
 
@@ -201,7 +274,7 @@ const getDesktopAutoExec = async () => {
 }
 
 const updateUser = async (
-  id: number,
+  findBy: GetUserBy,
   data: Partial<UserPayload>
 ): Promise<UserDetailsResponse> => {
   const { displayName, username, password, isAdmin, isActive, autoExec } = data
@@ -211,8 +284,13 @@ const updateUser = async (
   if (username) {
     // Checking if user is already in the database
     const usernameExist = await User.findOne({ username })
-    if (usernameExist && usernameExist.id != id)
-      throw new Error('Username already exists.')
+    if (usernameExist) {
+      if (
+        (findBy.id && usernameExist.id != findBy.id) ||
+        (findBy.username && usernameExist.username != findBy.username)
+      )
+        throw new Error('Username already exists.')
+    }
     params.username = username
   }
 
@@ -221,9 +299,10 @@ const updateUser = async (
     params.password = User.hashPassword(password)
   }
 
-  const updatedUser = await User.findOneAndUpdate({ id }, params, { new: true })
+  const updatedUser = await User.findOneAndUpdate(findBy, params, { new: true })
 
-  if (!updatedUser) throw new Error(`Unable to find user with id: ${id}`)
+  if (!updatedUser)
+    throw new Error(`Unable to find user with ${findBy.id || findBy.username}`)
 
   return {
     id: updatedUser.id,
@@ -245,11 +324,11 @@ const updateDesktopAutoExec = async (autoExec: string) => {
 }
 
 const deleteUser = async (
-  id: number,
+  findBy: GetUserBy,
   isAdmin: boolean,
   { password }: { password?: string }
 ) => {
-  const user = await User.findOne({ id })
+  const user = await User.findOne(findBy)
   if (!user) throw new Error('User is not found.')
 
   if (!isAdmin) {
@@ -257,5 +336,5 @@ const deleteUser = async (
     if (!validPass) throw new Error('Invalid password.')
   }
 
-  await User.deleteOne({ id })
+  await User.deleteOne(findBy)
 }
diff --git a/api/src/middlewares/verifyAdminIfNeeded.ts b/api/src/middlewares/verifyAdminIfNeeded.ts
index d126f3c..c9246f6 100644
--- a/api/src/middlewares/verifyAdminIfNeeded.ts
+++ b/api/src/middlewares/verifyAdminIfNeeded.ts
@@ -1,11 +1,22 @@
 import { RequestHandler } from 'express'
 
+// This middleware checks if a non-admin user trying to
+// access information of other user
 export const verifyAdminIfNeeded: RequestHandler = (req, res, next) => {
   const { user } = req
-  const userId = parseInt(req.params.userId)
 
-  if (!user?.isAdmin && user?.userId !== userId) {
-    return res.status(401).send('Admin account required')
+  if (!user?.isAdmin) {
+    let adminAccountRequired: boolean = true
+
+    if (req.params.userId) {
+      adminAccountRequired = user?.userId !== parseInt(req.params.userId)
+    } else if (req.params.username) {
+      adminAccountRequired = user?.username !== req.params.username
+    }
+
+    if (adminAccountRequired)
+      return res.status(401).send('Admin account required')
   }
+
   next()
 }
diff --git a/api/src/model/User.ts b/api/src/model/User.ts
index 04d550e..b70807d 100644
--- a/api/src/model/User.ts
+++ b/api/src/model/User.ts
@@ -45,6 +45,8 @@ interface IUserDocument extends UserPayload, Document {
 
 interface IUser extends IUserDocument {
   comparePassword(password: string): boolean
+  addGroup(groupObjectId: Schema.Types.ObjectId): Promise<IUser>
+  removeGroup(groupObjectId: Schema.Types.ObjectId): Promise<IUser>
 }
 interface IUserModel extends Model<IUser> {
   hashPassword(password: string): string
@@ -106,6 +108,28 @@ userSchema.method('comparePassword', function (password: string): boolean {
   if (bcrypt.compareSync(password, this.password)) return true
   return false
 })
+userSchema.method(
+  'addGroup',
+  async function (groupObjectId: Schema.Types.ObjectId) {
+    const groupIdIndex = this.groups.indexOf(groupObjectId)
+    if (groupIdIndex === -1) {
+      this.groups.push(groupObjectId)
+    }
+    this.markModified('groups')
+    return this.save()
+  }
+)
+userSchema.method(
+  'removeGroup',
+  async function (groupObjectId: Schema.Types.ObjectId) {
+    const groupIdIndex = this.groups.indexOf(groupObjectId)
+    if (groupIdIndex > -1) {
+      this.groups.splice(groupIdIndex, 1)
+    }
+    this.markModified('groups')
+    return this.save()
+  }
+)
 
 export const User: IUserModel = model<IUser, IUserModel>('User', userSchema)
 
diff --git a/api/src/routes/api/spec/user.spec.ts b/api/src/routes/api/spec/user.spec.ts
index 4e5e2bf..1c4fd99 100644
--- a/api/src/routes/api/spec/user.spec.ts
+++ b/api/src/routes/api/spec/user.spec.ts
@@ -3,7 +3,7 @@ import mongoose, { Mongoose } from 'mongoose'
 import { MongoMemoryServer } from 'mongodb-memory-server'
 import request from 'supertest'
 import appPromise from '../../../app'
-import { UserController } from '../../../controllers/'
+import { UserController, GroupController } from '../../../controllers/'
 import { generateAccessToken, saveTokensInDB } from '../../../utils'
 
 const clientId = 'someclientID'
@@ -270,6 +270,102 @@ describe('user', () => {
       expect(res.text).toEqual('Error: Username already exists.')
       expect(res.body).toEqual({})
     })
+
+    describe('by username', () => {
+      it('should respond with updated user when admin user requests', async () => {
+        const dbUser = await controller.createUser(user)
+        const newDisplayName = 'My new display Name'
+
+        const res = await request(app)
+          .patch(`/SASjsApi/user/by/username/${user.username}`)
+          .auth(adminAccessToken, { type: 'bearer' })
+          .send({ ...user, displayName: newDisplayName })
+          .expect(200)
+
+        expect(res.body.username).toEqual(user.username)
+        expect(res.body.displayName).toEqual(newDisplayName)
+        expect(res.body.isAdmin).toEqual(user.isAdmin)
+        expect(res.body.isActive).toEqual(user.isActive)
+      })
+
+      it('should respond with updated user when user himself requests', async () => {
+        const dbUser = await controller.createUser(user)
+        const accessToken = await generateAndSaveToken(dbUser.id)
+        const newDisplayName = 'My new display Name'
+
+        const res = await request(app)
+          .patch(`/SASjsApi/user/by/username/${user.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send({
+            displayName: newDisplayName,
+            username: user.username,
+            password: user.password
+          })
+          .expect(200)
+
+        expect(res.body.username).toEqual(user.username)
+        expect(res.body.displayName).toEqual(newDisplayName)
+        expect(res.body.isAdmin).toEqual(user.isAdmin)
+        expect(res.body.isActive).toEqual(user.isActive)
+      })
+
+      it('should respond with Bad Request, only admin can update isAdmin/isActive', async () => {
+        const dbUser = await controller.createUser(user)
+        const accessToken = await generateAndSaveToken(dbUser.id)
+        const newDisplayName = 'My new display Name'
+
+        await request(app)
+          .patch(`/SASjsApi/user/by/username/${user.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send({ ...user, displayName: newDisplayName })
+          .expect(400)
+      })
+
+      it('should respond with Unauthorized if access token is not present', async () => {
+        const res = await request(app)
+          .patch('/SASjsApi/user/by/username/1234')
+          .send(user)
+          .expect(401)
+
+        expect(res.text).toEqual('Unauthorized')
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Unauthorized when access token is not of an admin account or himself', async () => {
+        const dbUser1 = await controller.createUser(user)
+        const dbUser2 = await controller.createUser({
+          ...user,
+          username: 'randomUser'
+        })
+        const accessToken = await generateAndSaveToken(dbUser2.id)
+
+        const res = await request(app)
+          .patch(`/SASjsApi/user/${dbUser1.id}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send(user)
+          .expect(401)
+
+        expect(res.text).toEqual('Admin account required')
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Forbidden if username is already present', async () => {
+        const dbUser1 = await controller.createUser(user)
+        const dbUser2 = await controller.createUser({
+          ...user,
+          username: 'randomuser'
+        })
+
+        const res = await request(app)
+          .patch(`/SASjsApi/user/by/username/${dbUser1.username}`)
+          .auth(adminAccessToken, { type: 'bearer' })
+          .send({ username: dbUser2.username })
+          .expect(403)
+
+        expect(res.text).toEqual('Error: Username already exists.')
+        expect(res.body).toEqual({})
+      })
+    })
   })
 
   describe('delete', () => {
@@ -363,6 +459,89 @@ describe('user', () => {
       expect(res.text).toEqual('Error: Invalid password.')
       expect(res.body).toEqual({})
     })
+
+    describe('by username', () => {
+      it('should respond with OK when admin user requests', async () => {
+        const dbUser = await controller.createUser(user)
+
+        const res = await request(app)
+          .delete(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(adminAccessToken, { type: 'bearer' })
+          .send()
+          .expect(200)
+
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with OK when user himself requests', async () => {
+        const dbUser = await controller.createUser(user)
+        const accessToken = await generateAndSaveToken(dbUser.id)
+
+        const res = await request(app)
+          .delete(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send({ password: user.password })
+          .expect(200)
+
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Bad Request when user himself requests and password is missing', async () => {
+        const dbUser = await controller.createUser(user)
+        const accessToken = await generateAndSaveToken(dbUser.id)
+
+        const res = await request(app)
+          .delete(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send()
+          .expect(400)
+
+        expect(res.text).toEqual(`"password" is required`)
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Unauthorized when access token is not present', async () => {
+        const res = await request(app)
+          .delete('/SASjsApi/user/by/username/RandomUsername')
+          .send(user)
+          .expect(401)
+
+        expect(res.text).toEqual('Unauthorized')
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Unauthorized when access token is not of an admin account or himself', async () => {
+        const dbUser1 = await controller.createUser(user)
+        const dbUser2 = await controller.createUser({
+          ...user,
+          username: 'randomUser'
+        })
+        const accessToken = await generateAndSaveToken(dbUser2.id)
+
+        const res = await request(app)
+          .delete(`/SASjsApi/user/by/username/${dbUser1.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send(user)
+          .expect(401)
+
+        expect(res.text).toEqual('Admin account required')
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Forbidden when user himself requests and password is incorrect', async () => {
+        const dbUser = await controller.createUser(user)
+        const accessToken = await generateAndSaveToken(dbUser.id)
+
+        const res = await request(app)
+          .delete(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send({ password: 'incorrectpassword' })
+          .expect(403)
+
+        expect(res.text).toEqual('Error: Invalid password.')
+        expect(res.body).toEqual({})
+      })
+    })
   })
 
   describe('get', () => {
@@ -392,6 +571,7 @@ describe('user', () => {
       expect(res.body.isAdmin).toEqual(user.isAdmin)
       expect(res.body.isActive).toEqual(user.isActive)
       expect(res.body.autoExec).toEqual(user.autoExec)
+      expect(res.body.groups).toEqual([])
     })
 
     it('should respond with user autoExec when admin user requests', async () => {
@@ -409,6 +589,7 @@ describe('user', () => {
       expect(res.body.isAdmin).toEqual(user.isAdmin)
       expect(res.body.isActive).toEqual(user.isActive)
       expect(res.body.autoExec).toEqual(user.autoExec)
+      expect(res.body.groups).toEqual([])
     })
 
     it('should respond with user when access token is not of an admin account', async () => {
@@ -431,6 +612,34 @@ describe('user', () => {
       expect(res.body.isAdmin).toEqual(user.isAdmin)
       expect(res.body.isActive).toEqual(user.isActive)
       expect(res.body.autoExec).toBeUndefined()
+      expect(res.body.groups).toEqual([])
+    })
+
+    it('should respond with user along with associated groups', async () => {
+      const dbUser = await controller.createUser(user)
+      const userId = dbUser.id
+      const accessToken = await generateAndSaveToken(userId)
+
+      const group = {
+        name: 'DCGroup1',
+        description: 'DC group for testing purposes.'
+      }
+      const groupController = new GroupController()
+      const dbGroup = await groupController.createGroup(group)
+      await groupController.addUserToGroup(dbGroup.groupId, dbUser.id)
+
+      const res = await request(app)
+        .get(`/SASjsApi/user/${userId}`)
+        .auth(accessToken, { type: 'bearer' })
+        .send()
+        .expect(200)
+
+      expect(res.body.username).toEqual(user.username)
+      expect(res.body.displayName).toEqual(user.displayName)
+      expect(res.body.isAdmin).toEqual(user.isAdmin)
+      expect(res.body.isActive).toEqual(user.isActive)
+      expect(res.body.autoExec).toEqual(user.autoExec)
+      expect(res.body.groups.length).toBeGreaterThan(0)
     })
 
     it('should respond with Unauthorized if access token is not present', async () => {
@@ -455,6 +664,86 @@ describe('user', () => {
       expect(res.text).toEqual('Error: User is not found.')
       expect(res.body).toEqual({})
     })
+
+    describe('by username', () => {
+      it('should respond with user autoExec when same user requests', async () => {
+        const dbUser = await controller.createUser(user)
+        const userId = dbUser.id
+        const accessToken = await generateAndSaveToken(userId)
+
+        const res = await request(app)
+          .get(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send()
+          .expect(200)
+
+        expect(res.body.username).toEqual(user.username)
+        expect(res.body.displayName).toEqual(user.displayName)
+        expect(res.body.isAdmin).toEqual(user.isAdmin)
+        expect(res.body.isActive).toEqual(user.isActive)
+        expect(res.body.autoExec).toEqual(user.autoExec)
+      })
+
+      it('should respond with user autoExec when admin user requests', async () => {
+        const dbUser = await controller.createUser(user)
+
+        const res = await request(app)
+          .get(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(adminAccessToken, { type: 'bearer' })
+          .send()
+          .expect(200)
+
+        expect(res.body.username).toEqual(user.username)
+        expect(res.body.displayName).toEqual(user.displayName)
+        expect(res.body.isAdmin).toEqual(user.isAdmin)
+        expect(res.body.isActive).toEqual(user.isActive)
+        expect(res.body.autoExec).toEqual(user.autoExec)
+      })
+
+      it('should respond with user when access token is not of an admin account', async () => {
+        const accessToken = await generateSaveTokenAndCreateUser({
+          ...user,
+          username: 'randomUser'
+        })
+
+        const dbUser = await controller.createUser(user)
+
+        const res = await request(app)
+          .get(`/SASjsApi/user/by/username/${dbUser.username}`)
+          .auth(accessToken, { type: 'bearer' })
+          .send()
+          .expect(200)
+
+        expect(res.body.username).toEqual(user.username)
+        expect(res.body.displayName).toEqual(user.displayName)
+        expect(res.body.isAdmin).toEqual(user.isAdmin)
+        expect(res.body.isActive).toEqual(user.isActive)
+        expect(res.body.autoExec).toBeUndefined()
+      })
+
+      it('should respond with Unauthorized if access token is not present', async () => {
+        const res = await request(app)
+          .get('/SASjsApi/user/by/username/randomUsername')
+          .send()
+          .expect(401)
+
+        expect(res.text).toEqual('Unauthorized')
+        expect(res.body).toEqual({})
+      })
+
+      it('should respond with Forbidden if username is incorrect', async () => {
+        await controller.createUser(user)
+
+        const res = await request(app)
+          .get('/SASjsApi/user/by/username/randomUsername')
+          .auth(adminAccessToken, { type: 'bearer' })
+          .send()
+          .expect(403)
+
+        expect(res.text).toEqual('Error: User is not found.')
+        expect(res.body).toEqual({})
+      })
+    })
   })
 
   describe('getAll', () => {
diff --git a/api/src/routes/api/user.ts b/api/src/routes/api/user.ts
index fcd6d5e..20ce88c 100644
--- a/api/src/routes/api/user.ts
+++ b/api/src/routes/api/user.ts
@@ -7,6 +7,7 @@ import {
 } from '../../middlewares'
 import {
   deleteUserValidation,
+  getUserValidation,
   registerUserValidation,
   updateUserValidation
 } from '../../utils'
@@ -36,6 +37,25 @@ userRouter.get('/', authenticateAccessToken, async (req, res) => {
   }
 })
 
+userRouter.get(
+  '/by/username/:username',
+  authenticateAccessToken,
+  async (req, res) => {
+    const { error, value: params } = getUserValidation(req.params)
+    if (error) return res.status(400).send(error.details[0].message)
+
+    const { username } = params
+
+    const controller = new UserController()
+    try {
+      const response = await controller.getUserByUsername(req, username)
+      res.send(response)
+    } catch (err: any) {
+      res.status(403).send(err.toString())
+    }
+  }
+)
+
 userRouter.get('/:userId', authenticateAccessToken, async (req, res) => {
   const { userId } = req.params
 
@@ -48,6 +68,34 @@ userRouter.get('/:userId', authenticateAccessToken, async (req, res) => {
   }
 })
 
+userRouter.patch(
+  '/by/username/:username',
+  authenticateAccessToken,
+  verifyAdminIfNeeded,
+  async (req, res) => {
+    const { user } = req
+    const { error: errorUsername, value: params } = getUserValidation(
+      req.params
+    )
+    if (errorUsername)
+      return res.status(400).send(errorUsername.details[0].message)
+
+    const { username } = params
+
+    // only an admin can update `isActive` and `isAdmin` fields
+    const { error, value: body } = updateUserValidation(req.body, user!.isAdmin)
+    if (error) return res.status(400).send(error.details[0].message)
+
+    const controller = new UserController()
+    try {
+      const response = await controller.updateUserByUsername(username, body)
+      res.send(response)
+    } catch (err: any) {
+      res.status(403).send(err.toString())
+    }
+  }
+)
+
 userRouter.patch(
   '/:userId',
   authenticateAccessToken,
@@ -70,6 +118,34 @@ userRouter.patch(
   }
 )
 
+userRouter.delete(
+  '/by/username/:username',
+  authenticateAccessToken,
+  verifyAdminIfNeeded,
+  async (req, res) => {
+    const { user } = req
+    const { error: errorUsername, value: params } = getUserValidation(
+      req.params
+    )
+    if (errorUsername)
+      return res.status(400).send(errorUsername.details[0].message)
+
+    const { username } = params
+
+    // only an admin can delete user without providing password
+    const { error, value: data } = deleteUserValidation(req.body, user!.isAdmin)
+    if (error) return res.status(400).send(error.details[0].message)
+
+    const controller = new UserController()
+    try {
+      await controller.deleteUserByUsername(username, data, user!.isAdmin)
+      res.status(200).send('Account Deleted!')
+    } catch (err: any) {
+      res.status(403).send(err.toString())
+    }
+  }
+)
+
 userRouter.delete(
   '/:userId',
   authenticateAccessToken,
diff --git a/api/src/utils/validation.ts b/api/src/utils/validation.ts
index 33a403f..3499715 100644
--- a/api/src/utils/validation.ts
+++ b/api/src/utils/validation.ts
@@ -5,6 +5,11 @@ const passwordSchema = Joi.string().min(6).max(1024)
 
 export const blockFileRegex = /\.(exe|sh|htaccess)$/i
 
+export const getUserValidation = (data: any): Joi.ValidationResult =>
+  Joi.object({
+    username: usernameSchema.required()
+  }).validate(data)
+
 export const loginWebValidation = (data: any): Joi.ValidationResult =>
   Joi.object({
     username: usernameSchema.required(),