diff --git a/config/passport.js b/config/passport.js
index 88c930a..113ee03 100644
--- a/config/passport.js
+++ b/config/passport.js
@@ -1,5 +1,5 @@
 const passport = require('koa-passport')
-const User = require('../src/models/users')
+const User = require('../src/adapters/localdb/models/users')
 const Strategy = require('passport-local')
 
 passport.serializeUser((user, done) => {
@@ -15,24 +15,34 @@ passport.deserializeUser(async (id, done) => {
   }
 })
 
-passport.use('local', new Strategy({
-  usernameField: 'email',
-  passwordField: 'password'
-}, async (email, password, done) => {
-  try {
-    const user = await User.findOne({ email })
-    if (!user) { return done(null, false) }
+passport.use(
+  'local',
+  new Strategy(
+    {
+      usernameField: 'email',
+      passwordField: 'password'
+    },
+    async (email, password, done) => {
+      try {
+        const user = await User.findOne({ email })
+        if (!user) {
+          return done(null, false)
+        }
 
-    try {
-      const isMatch = await user.validatePassword(password)
+        try {
+          const isMatch = await user.validatePassword(password)
 
-      if (!isMatch) { return done(null, false) }
+          if (!isMatch) {
+            return done(null, false)
+          }
 
-      done(null, user)
-    } catch (err) {
-      done(err)
+          done(null, user)
+        } catch (err) {
+          done(err)
+        }
+      } catch (err) {
+        return done(err)
+      }
     }
-  } catch (err) {
-    return done(err)
-  }
-}))
+  )
+)
diff --git a/src/adapters/index.js b/src/adapters/index.js
index 251b2f3..8a96f89 100644
--- a/src/adapters/index.js
+++ b/src/adapters/index.js
@@ -4,8 +4,12 @@
   https://troutsblog.com/blog/clean-architecture
 */
 
-// Individual adapter libraries.
+// Load individual adapter libraries.
 const IPFSAdapter = require('./ipfs')
-const ipfs = new IPFSAdapter()
+const LocalDB = require('./localdb')
 
-module.exports = { ipfs }
+// Instantiate adapter libraries.
+const ipfs = new IPFSAdapter()
+const localdb = new LocalDB()
+
+module.exports = { ipfs, localdb }
diff --git a/src/adapters/localdb/index.js b/src/adapters/localdb/index.js
new file mode 100644
index 0000000..1589241
--- /dev/null
+++ b/src/adapters/localdb/index.js
@@ -0,0 +1,15 @@
+/*
+  This library encapsulates code concerned with MongoDB and Mongoose models.
+*/
+
+// Load Mongoose models.
+const Users = require('./models/users')
+
+class LocalDB {
+  constructor () {
+    // Encapsulate dependencies
+    this.Users = Users
+  }
+}
+
+module.exports = LocalDB
diff --git a/src/models/users.js b/src/adapters/localdb/models/users.js
similarity index 97%
rename from src/models/users.js
rename to src/adapters/localdb/models/users.js
index 46164ed..918d294 100644
--- a/src/models/users.js
+++ b/src/adapters/localdb/models/users.js
@@ -1,6 +1,6 @@
 const mongoose = require('mongoose')
 const bcrypt = require('bcryptjs')
-const config = require('../../config')
+const config = require('../../../../config')
 const jwt = require('jsonwebtoken')
 
 const User = new mongoose.Schema({
@@ -19,7 +19,6 @@ const User = new mongoose.Schema({
       },
       message: props => `${props.value} is not a valid Email format!`
     }
-
   }
 })
 
diff --git a/src/controllers/json-rpc/validators.js b/src/controllers/json-rpc/validators.js
index 2df5f6e..7158dbf 100644
--- a/src/controllers/json-rpc/validators.js
+++ b/src/controllers/json-rpc/validators.js
@@ -8,7 +8,7 @@ const jwt = require('jsonwebtoken')
 
 // Local libraries
 const config = require('../../../config')
-const UserModel = require('../../models/users')
+const UserModel = require('../../adapters/localdb/models/users')
 
 class Validators {
   constructor () {
diff --git a/src/controllers/rest-api/middleware/validators.js b/src/controllers/rest-api/middleware/validators.js
index 80cc850..7c5c1c9 100644
--- a/src/controllers/rest-api/middleware/validators.js
+++ b/src/controllers/rest-api/middleware/validators.js
@@ -2,7 +2,7 @@
   REST API validator middleware.
 */
 
-const User = require('../../../models/users')
+const User = require('../../../adapters/localdb/models/users')
 const config = require('../../../../config')
 const getToken = require('../../../lib/auth')
 const jwt = require('jsonwebtoken')
diff --git a/src/controllers/rest-api/users/controller.js b/src/controllers/rest-api/users/controller.js
index aaa51af..47ed22b 100644
--- a/src/controllers/rest-api/users/controller.js
+++ b/src/controllers/rest-api/users/controller.js
@@ -3,7 +3,7 @@
 */
 
 // User database model.
-const UserModel = require('../../../models/users')
+const UserModel = require('../../../adapters/localdb/models/users')
 
 // User library for business logic.
 const UserLib = require('../../../lib/users')
diff --git a/src/lib/admin.js b/src/lib/admin.js
index 7b08455..18306e1 100644
--- a/src/lib/admin.js
+++ b/src/lib/admin.js
@@ -12,7 +12,7 @@
 'use strict'
 const axios = require('axios').default
 const mongoose = require('mongoose')
-const User = require('../models/users')
+const User = require('../adapters/localdb/models/users')
 const config = require('../../config')
 const JsonFiles = require('./utils/json-files')
 const jsonFiles = new JsonFiles()
diff --git a/src/lib/users.js b/src/lib/users.js
index 2f10996..c195841 100644
--- a/src/lib/users.js
+++ b/src/lib/users.js
@@ -3,7 +3,7 @@
   functions are called by the /user REST API endpoints.
 */
 
-const UserModel = require('../models/users')
+const UserModel = require('../adapters/localdb/models/users')
 const wlogger = require('./wlogger')
 
 class UserLib {
diff --git a/test/unit/json-rpc/a13-users.unit.js b/test/unit/json-rpc/a13-users.unit.js
index e8e9b1d..3d1c227 100644
--- a/test/unit/json-rpc/a13-users.unit.js
+++ b/test/unit/json-rpc/a13-users.unit.js
@@ -16,7 +16,7 @@ process.env.SVC_ENV = 'test'
 const config = require('../../../config')
 const UserRPC = require('../../../src/controllers/json-rpc/users')
 const RateLimit = require('../../../src/controllers/json-rpc/rate-limit')
-const UserModel = require('../../../src/models/users')
+const UserModel = require('../../../src/adapters/localdb/models/users')
 
 describe('#UserRPC', () => {
   let uut
diff --git a/test/unit/rest-api/a02-users.rest-unit.js b/test/unit/rest-api/a02-users.rest-unit.js
index ef87e32..9a2fe5e 100644
--- a/test/unit/rest-api/a02-users.rest-unit.js
+++ b/test/unit/rest-api/a02-users.rest-unit.js
@@ -10,7 +10,7 @@ const mongoose = require('mongoose')
 // Local support libraries
 const config = require('../../../config')
 const testUtils = require('../../utils/test-utils')
-const User = require('../../../src/models/users')
+const User = require('../../../src/adapters/localdb/models/users')
 
 const UserController = require('../../../src/controllers/rest-api/users/controller')
 let uut
diff --git a/test/utils/test-utils.js b/test/utils/test-utils.js
index 31b26b0..02d72b4 100644
--- a/test/utils/test-utils.js
+++ b/test/utils/test-utils.js
@@ -8,7 +8,7 @@ const axios = require('axios').default
 
 // Local libraries
 const config = require('../../config')
-const User = require('../../src/models/users')
+const User = require('../../src/adapters/localdb/models/users')
 
 const LOCALHOST = `http://localhost:${config.port}`