diff --git a/.eslintrc.js b/.eslintrc.js
index 99f890d..3db6aa1 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -57,24 +57,26 @@ module.exports = {
             'never'
         ],
 
-        '@typescript-eslint/no-extra-semi': 'warn',
-
+        '@typescript-eslint/ban-types': 'off',
+        
         'no-plusplus': 'off',
         'implicit-arrow-linebreak': 'off',
         'operator-linebreak': 'off',
-
+        
         'arrow-body-style': 'off',
         'no-param-reassign': 'off',
         'consistent-return': 'off',
         'function-paren-newline': 'off',
         'no-mixed-spaces-and-tabs': 'off',
-
+        
         'eol-last': 'warn',
-
+        
         'linebreak-style': [
             'error',
             'unix'
         ],
+        
+        '@typescript-eslint/no-extra-semi': 'warn',
 
         '@typescript-eslint/consistent-type-definitions': [
             'warn',
diff --git a/changelog.md b/changelog.md
index a7f9cc5..6d92459 100644
--- a/changelog.md
+++ b/changelog.md
@@ -6,6 +6,9 @@
 
 ## 🕘 | Changelog
 
+**v3.0.1**
+- Now all the `key` parameters allow to pass in the normal `string` type, alongside the **keys autocomplete** feature released in **v3.0.0**.
+
 **v3.0.0**
 - Improved documentation, fixed typos & mismatches.
 - Fixed minor types bugs.
diff --git a/docs/README.md b/docs/README.md
index 16b0898..e7da083 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,4 +1,4 @@
-# `quick-mongo-super v3.0.0` documentation
+# `quick-mongo-super v3.0.1` documentation
 
 ## Classes
 - [`QuickMongo<K, V>`](classes/QuickMongo.md)
@@ -21,6 +21,7 @@
 - [`ExtractObjectKeys<T>`](types/ExtractObjectKeys.md)
 - [`ExtractObjectValues<T>`](types/ExtractObjectValues.md)
 - [`ExtractObjectEntries<T>`](types/ExtractObjectEntries.md)
+- [`AutocompletableString<S>`](types/AutocompletableString.md)
 
 ## Interfaces
 - [`IDatabaseConfiguration`](interfaces/IDatabaseConfiguration.md)
diff --git a/docs/classes/QuickMongo.md b/docs/classes/QuickMongo.md
index 00caa3e..77b17fc 100644
--- a/docs/classes/QuickMongo.md
+++ b/docs/classes/QuickMongo.md
@@ -22,6 +22,7 @@ You can see the **detailed** examples on usage of each method in both **JavaScri
   - [`FirstObjectKey<TKey>`](../types/FirstObjectKey.md)
   - [`ObjectPath<T, TKey>`](../types/ObjectPath.md)
   - [`ObjectValue<T, P>`](../types/ObjectValue.md)
+  - [`AutocompletableString<S>`](../types/AutocompletableString.md)
 - Interfaces:
   - [`IDatabaseConfiguration`](../interfaces/IDatabaseConfiguration.md)
   - [`IDatabaseInternalStructure<T>`](../interfaces/IDatabaseInternalStructure.md)
@@ -82,7 +83,7 @@ new QuickMongo<K, V>(quickMongoClient: QuickMongoClient, databaseOptions?: IData
 
 ## Methods
 
-## `get<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>>`
+## `get<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>>`
 Retrieves a value from database by a key.
 
 - **Parameters:**
@@ -99,7 +100,7 @@ Retrieves a value from database by a key.
   console.log(objectPropertyAccessed) // -> []
 ```
 
-## `getFromDatabase<P extends ObjectPath<V>>(key: P): Promise<Maybe<ObjectValue<V, P>>>`
+## `getFromDatabase<P extends ObjectPath<V>>(key: AutocompletableString<P>): Promise<Maybe<ObjectValue<V, P>>>`
 Retrieves a value from database by a key via sending a **direct request** to remote cluster, **omitting** the cache.
 
 - **Parameters:**
@@ -117,7 +118,7 @@ Retrieves a value from database by a key via sending a **direct request** to rem
 ```
 
 
-## `fetch<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>>`
+## `fetch<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>>`
 Retrieves a value from database by a key.
 
 - **Parameters:**
@@ -135,7 +136,7 @@ Retrieves a value from database by a key.
 ```
 
 
-## `has<P extends ObjectPath<V>>(key: P): boolean`
+## `has<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean`
 Determines if the data is stored in database.
 
 - **Parameters:**
@@ -156,7 +157,7 @@ Determines if the data is stored in database.
 ```
 
 
-## `set<P extends ObjectPath<V>>(key: P, value: ObjectValue<V, P>): Promise<If<IsObject<V>, FirstObjectKey<P>, V>>`
+## `set<P extends ObjectPath<V>>(key: AutocompletableString<P>, value: ObjectValue<V, P>): Promise<If<IsObject<V>, FirstObjectKey<P>, V>>`
 Writes the specified value into database under the specified key.
 
 - **Parameters:**
@@ -190,7 +191,7 @@ Writes the specified value into database under the specified key.
 ```
 
 
-## `delete<P extends ObjectPath<V>>(key: P): Promise<boolean>`
+## `delete<P extends ObjectPath<V>>(key: AutocompletableString<P>): Promise<boolean>`
 Deletes the data from database by key.
 
 - **Parameters:**
@@ -215,7 +216,7 @@ Sends a read, write and delete requests to the remote database and returns the r
 ```
 
 
-## `add<P extends ObjectPath<V>>(key: P, numberToAdd: number): Promise<number>`
+## `add<P extends ObjectPath<V>>(key: AutocompletableString<P>, numberToAdd: number): Promise<number>`
 Performs an arithmetical addition on a target number in the database.
 
 **[!!!] The type of target value must be a number.**
@@ -233,7 +234,7 @@ Performs an arithmetical addition on a target number in the database.
 ```
 
 
-## `subtract<P extends ObjectPath<V>>(key: P, numberToSubtract: number): Promise<number>`
+## `subtract<P extends ObjectPath<V>>(key: AutocompletableString<P>, numberToSubtract: number): Promise<number>`
 Performs an arithmetical subtraction on a target number in the database.
 
 **[!!!] The type of target value must be a number.**
@@ -245,7 +246,7 @@ Performs an arithmetical subtraction on a target number in the database.
 - **Returns:** `Promise<number>` - Subtraction operation result.
 
 
-## `isTargetArray<P extends ObjectPath<V>>(key: P): boolean`
+## `isTargetArray<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean`
 Determines whether the specified target is an array.
 
 - **Parameters:**
@@ -259,7 +260,7 @@ Determines whether the specified target is an array.
 ```
 
 
-## `isTargetNumber<P extends ObjectPath<V>>(key: P): boolean`
+## `isTargetNumber<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean`
 Determines whether the specified target is a number.
 
 - **Parameters:**
@@ -334,7 +335,7 @@ Iterates over root database values and checks if the specified condition in the
 - **Returns:** `boolean
 
 
-## `push<P extends ObjectPath<V>>(key: P, ...values: RestOrArray<ExtractFromArray<ObjectValue<V, P>>>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
+## `push<P extends ObjectPath<V>>(key: AutocompletableString<P>, ...values: RestOrArray<ExtractFromArray<ObjectValue<V, P>>>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
 Pushes the specified value(s) into the target array in the database.
 
 **[!!!] The type of target value must be an array.**
@@ -351,7 +352,7 @@ Pushes the specified value(s) into the target array in the database.
 ```
 
 
-## `pull<P extends ObjectPath<V>>(key: P, targetArrayElementIndex: number, value: ObjectValue<V, P>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
+## `pull<P extends ObjectPath<V>>(key: AutocompletableString<P>, targetArrayElementIndex: number, value: ObjectValue<V, P>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
 Pushes the specified value into the target array in the database.
 
 **[!!!] The type of target value must be an array.**
@@ -369,7 +370,7 @@ Pushes the specified value into the target array in the database.
 ```
 
 
-## `pop<P extends ObjectPath<V>>(key: P, ...targetArrayElementIndexes: RestOrArray<ExtractFromArray<number>>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
+## `pop<P extends ObjectPath<V>>(key: AutocompletableString<P>, ...targetArrayElementIndexes: RestOrArray<ExtractFromArray<number>>): Promise<ExtractFromArray<ObjectValue<V, P>>[]>`
 Removes the specified element(s) from the target array in the database.
 
 **[!!!] The type of target value must be an array.**
@@ -412,7 +413,7 @@ Returns an array of object values by specified database key.
 ```
 
 
-## `random<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>>`
+## `random<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>>`
 Picks a random element of array in the database and returns the picked array element.
 
 - **Parameters:**
diff --git a/docs/types/AutocompletableString.md b/docs/types/AutocompletableString.md
new file mode 100644
index 0000000..09d4e50
--- /dev/null
+++ b/docs/types/AutocompletableString.md
@@ -0,0 +1,11 @@
+# **`AutocompletableString<S>` Type**
+
+Makes an autocompletable union string type compatible with a `string` type.
+
+## Implementation
+```ts
+export type AutocompletableString<S extends string> = S | (string & {})
+```
+
+- **Type Parameters:**
+  - `S` (`string`): The autocompletable union string type to make compatible with a `string` type.
diff --git a/package-lock.json b/package-lock.json
index f3ceddd..8b4c389 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "quick-mongo-super",
-  "version": "2.3.0",
+  "version": "3.0.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "quick-mongo-super",
-      "version": "2.3.0",
+      "version": "3.0.1",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
@@ -18,11 +18,11 @@
         "@jest/globals": "^29.7.0",
         "@types/jest": "^29.5.7",
         "@types/node-fetch": "^2.6.1",
-        "@typescript-eslint/eslint-plugin": "^6.18.1",
+        "@typescript-eslint/eslint-plugin": "^6.21.0",
         "@typescript-eslint/parser": "^6.18.1",
         "ts-jest": "^29.1.1",
         "ts-node": "^10.9.1",
-        "typescript": "^5.3.2"
+        "typescript": "^5.5.4"
       }
     },
     "node_modules/@aashutoshrathi/word-wrap": {
@@ -1469,16 +1469,16 @@
       "dev": true
     },
     "node_modules/@typescript-eslint/eslint-plugin": {
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+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-6.21.0.tgz",
+      "integrity": "sha512-oy9+hTPCUFpngkEZUSzbf9MxI65wbKFoQYsgPdILTfbUldp5ovUuphZVe4i30emU9M/kP+T64Di0mxl7dSw3MA==",
       "dev": true,
       "dependencies": {
         "@eslint-community/regexpp": "^4.5.1",
-        "@typescript-eslint/scope-manager": "6.18.1",
-        "@typescript-eslint/type-utils": "6.18.1",
-        "@typescript-eslint/utils": "6.18.1",
-        "@typescript-eslint/visitor-keys": "6.18.1",
+        "@typescript-eslint/scope-manager": "6.21.0",
+        "@typescript-eslint/type-utils": "6.21.0",
+        "@typescript-eslint/utils": "6.21.0",
+        "@typescript-eslint/visitor-keys": "6.21.0",
         "debug": "^4.3.4",
         "graphemer": "^1.4.0",
         "ignore": "^5.2.4",
@@ -1503,16 +1503,14 @@
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+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/scope-manager": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-6.21.0.tgz",
+      "integrity": "sha512-OwLUIWZJry80O99zvqXVEioyniJMa+d2GrqpUTqi5/v5D5rOrppJVBPa0yKCblcigC0/aYAzxxqQ1B+DS2RYsg==",
       "dev": true,
       "dependencies": {
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-        "@typescript-eslint/utils": "6.18.1",
-        "debug": "^4.3.4",
-        "ts-api-utils": "^1.0.1"
+        "@typescript-eslint/types": "6.21.0",
+        "@typescript-eslint/visitor-keys": "6.21.0"
       },
       "engines": {
         "node": "^16.0.0 || >=18.0.0"
@@ -1520,29 +1518,29 @@
       "funding": {
         "type": "opencollective",
         "url": "https://opencollective.com/typescript-eslint"
+      }
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+      "dev": true,
+      "engines": {
+        "node": "^16.0.0 || >=18.0.0"
       },
-      "peerDependencies": {
-        "eslint": "^7.0.0 || ^8.0.0"
-      },
-      "peerDependenciesMeta": {
-        "typescript": {
-          "optional": true
-        }
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
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+    "node_modules/@typescript-eslint/eslint-plugin/node_modules/@typescript-eslint/visitor-keys": {
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+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-6.21.0.tgz",
+      "integrity": "sha512-JJtkDduxLi9bivAB+cYOVMtbkqdPOhZ+ZI5LC47MIRrDV4Yn2o+ZnW10Nkmr28xRpSpdJ6Sm42Hjf2+REYXm0A==",
       "dev": true,
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-        "@eslint-community/eslint-utils": "^4.4.0",
-        "@types/json-schema": "^7.0.12",
-        "@types/semver": "^7.5.0",
-        "@typescript-eslint/scope-manager": "6.18.1",
-        "@typescript-eslint/types": "6.18.1",
-        "@typescript-eslint/typescript-estree": "6.18.1",
-        "semver": "^7.5.4"
+        "@typescript-eslint/types": "6.21.0",
+        "eslint-visitor-keys": "^3.4.1"
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@@ -1550,9 +1548,6 @@
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@@ -1600,6 +1595,115 @@
         "url": "https://opencollective.com/typescript-eslint"
       }
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+    "node_modules/@typescript-eslint/type-utils": {
+      "version": "6.21.0",
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+      "dev": true,
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+        "@typescript-eslint/utils": "6.21.0",
+        "debug": "^4.3.4",
+        "ts-api-utils": "^1.0.1"
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+      "dev": true,
+      "dependencies": {
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+      }
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+    "node_modules/@typescript-eslint/type-utils/node_modules/minimatch": {
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+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.3.tgz",
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+      "dev": true,
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
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@@ -1665,6 +1769,130 @@
         "url": "https://github.com/sponsors/isaacs"
       }
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+      "dev": true,
+      "dependencies": {
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+        "@types/json-schema": "^7.0.12",
+        "@types/semver": "^7.5.0",
+        "@typescript-eslint/scope-manager": "6.21.0",
+        "@typescript-eslint/types": "6.21.0",
+        "@typescript-eslint/typescript-estree": "6.21.0",
+        "semver": "^7.5.4"
+      },
+      "engines": {
+        "node": "^16.0.0 || >=18.0.0"
+      },
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+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
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+      "dev": true,
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@@ -5132,9 +5360,9 @@
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@@ -6514,16 +6742,16 @@
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-        "@typescript-eslint/utils": "6.18.1",
-        "@typescript-eslint/visitor-keys": "6.18.1",
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@@ -6532,31 +6760,30 @@
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-            "@typescript-eslint/utils": "6.18.1",
-            "debug": "^4.3.4",
-            "ts-api-utils": "^1.0.1"
+            "@typescript-eslint/types": "6.21.0",
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+        "@typescript-eslint/types": {
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+          "dev": true
+        },
+        "@typescript-eslint/visitor-keys": {
+          "version": "6.21.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-6.21.0.tgz",
+          "integrity": "sha512-JJtkDduxLi9bivAB+cYOVMtbkqdPOhZ+ZI5LC47MIRrDV4Yn2o+ZnW10Nkmr28xRpSpdJ6Sm42Hjf2+REYXm0A==",
           "dev": true,
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-            "@types/json-schema": "^7.0.12",
-            "@types/semver": "^7.5.0",
-            "@typescript-eslint/scope-manager": "6.18.1",
-            "@typescript-eslint/types": "6.18.1",
-            "@typescript-eslint/typescript-estree": "6.18.1",
-            "semver": "^7.5.4"
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@@ -6584,6 +6811,70 @@
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+        "debug": "^4.3.4",
+        "ts-api-utils": "^1.0.1"
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+          "dev": true
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "6.21.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-6.21.0.tgz",
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+            "debug": "^4.3.4",
+            "globby": "^11.1.0",
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+            "eslint-visitor-keys": "^3.4.1"
+          }
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+        "brace-expansion": {
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+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
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+          }
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       "resolved": "https://registry.npmjs.org/@typescript-eslint/types/-/types-6.18.1.tgz",
@@ -6626,6 +6917,83 @@
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+      "dev": true,
+      "requires": {
+        "@eslint-community/eslint-utils": "^4.4.0",
+        "@types/json-schema": "^7.0.12",
+        "@types/semver": "^7.5.0",
+        "@typescript-eslint/scope-manager": "6.21.0",
+        "@typescript-eslint/types": "6.21.0",
+        "@typescript-eslint/typescript-estree": "6.21.0",
+        "semver": "^7.5.4"
+      },
+      "dependencies": {
+        "@typescript-eslint/scope-manager": {
+          "version": "6.21.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/scope-manager/-/scope-manager-6.21.0.tgz",
+          "integrity": "sha512-OwLUIWZJry80O99zvqXVEioyniJMa+d2GrqpUTqi5/v5D5rOrppJVBPa0yKCblcigC0/aYAzxxqQ1B+DS2RYsg==",
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+            "@typescript-eslint/visitor-keys": "6.21.0"
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+          "dev": true
+        },
+        "@typescript-eslint/typescript-estree": {
+          "version": "6.21.0",
+          "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-6.21.0.tgz",
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+            "eslint-visitor-keys": "^3.4.1"
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+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+          "dev": true,
+          "requires": {
+            "balanced-match": "^1.0.0"
+          }
+        },
+        "minimatch": {
+          "version": "9.0.3",
+          "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-9.0.3.tgz",
+          "integrity": "sha512-RHiac9mvaRw0x3AYRgDC1CxAP7HTcNrrECeA8YYJeWnpo+2Q5CegtZjaotWTWxDG3UeGA1coE05iH1mPjT/2mg==",
+          "dev": true,
+          "requires": {
+            "brace-expansion": "^2.0.1"
+          }
+        }
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     "@typescript-eslint/visitor-keys": {
       "version": "6.18.1",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-6.18.1.tgz",
@@ -9099,9 +9467,9 @@
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-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.3.2.tgz",
-      "integrity": "sha512-6l+RyNy7oAHDfxC4FzSJcz9vnjTKxrLpDG5M2Vu4SHRVNg6xzqZp6LYSR9zjqQTu8DU/f5xwxUdADOkbrIX2gQ==",
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
       "dev": true
     },
     "update-browserslist-db": {
diff --git a/package.json b/package.json
index 9e3cbf7..43b4ae7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "quick-mongo-super",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "Quick Mongo Super is a light-weight and easy-to-use Node.js module written in TypeScript to work with MongoDB.",
   "main": "./dist/src/index.js",
   "types": "./dist/typings/src/index.d.ts",
@@ -79,10 +79,10 @@
     "@jest/globals": "^29.7.0",
     "@types/jest": "^29.5.7",
     "@types/node-fetch": "^2.6.1",
-    "@typescript-eslint/eslint-plugin": "^6.18.1",
+    "@typescript-eslint/eslint-plugin": "^6.21.0",
     "@typescript-eslint/parser": "^6.18.1",
     "ts-jest": "^29.1.1",
     "ts-node": "^10.9.1",
-    "typescript": "^5.3.2"
+    "typescript": "^5.5.4"
   }
 }
diff --git a/src/lib/QuickMongo.ts b/src/lib/QuickMongo.ts
index f306b2e..ec5d093 100644
--- a/src/lib/QuickMongo.ts
+++ b/src/lib/QuickMongo.ts
@@ -20,6 +20,7 @@ import { TypedObject } from './utils/TypedObject'
 import { QuickMongoError } from './utils/QuickMongoError'
 
 import {
+    AutocompletableString,
     ExtractFromArray, FirstObjectKey,
     If, IsObject, Maybe, ObjectPath,
     ObjectValue, QueryFunction, RestOrArray
@@ -359,7 +360,7 @@ export class QuickMongo<K extends string = string, V = any> {
     /**
      * Retrieves a value from database by a key.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {Maybe<ObjectValue<V, P>>} The value of the target in database.
      *
      * @example
@@ -379,7 +380,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    }
      * // }
      */
-    public get<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>> {
+    public get<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>> {
         return this._cache.get(key)
     }
 
@@ -387,7 +388,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * Retrieves a value from database by a key via sending a **direct request**
      * to remote cluster, **omitting** the cache.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {Promise<Maybe<ObjectValue<V, P>>>} The value of the target in database.
      *
      * @example
@@ -407,7 +408,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    }
      * // }
      */
-    public async getFromDatabase<P extends ObjectPath<V>>(key: P): Promise<Maybe<ObjectValue<V, P>>> {
+    public async getFromDatabase<P extends ObjectPath<V>>(key: AutocompletableString<P>): Promise<Maybe<ObjectValue<V, P>>> {
         if (!this._client.connected) {
             throw new QuickMongoError('CONNECTION_NOT_ESTABLISHED')
         }
@@ -441,7 +442,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * - This method is an alias for {@link QuickMongo.get()} method.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {Maybe<ObjectValue<V, P>>} The value from database.
      *
      * @example
@@ -460,13 +461,13 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    }
      * // }
      */
-    public fetch<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>> {
+    public fetch<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>> {
         return this.get(key)
     }
 
     /**
      * Determines if the data is stored in database.
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {boolean} Whether the data is stored in database.
      *
      * @example
@@ -493,7 +494,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    }
      * // }
      */
-    public has<P extends ObjectPath<V>>(key: P): boolean {
+    public has<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean {
         const target = this.get(key)
         return target !== null && target !== undefined
     }
@@ -501,7 +502,7 @@ export class QuickMongo<K extends string = string, V = any> {
     /**
      * Writes the specified value into database under the specified key.
      *
-     * @param {string} key The key to write in the target.
+     * @param {AutocompletableString<P>} key The key to write in the target.
      * @param {ObjectValue<V, P>} value The value to write.
      *
      * @returns {Promise<If<IsObject<V>, FirstObjectKey<P>, V>>}
@@ -547,7 +548,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * // }
      */
     public async set<P extends ObjectPath<V>>(
-        key: P,
+        key: AutocompletableString<P>,
         value: ObjectValue<V, P>
     ): Promise<If<IsObject<V>, FirstObjectKey<P>, V>> {
         const allDatabase = this.all()
@@ -589,7 +590,7 @@ export class QuickMongo<K extends string = string, V = any> {
 
     /**
      * Deletes the data from database by key.
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {Promise<boolean>} Whether the deletition was successful.
      *
      * @example
@@ -611,7 +612,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //     }
      * // }
      */
-    public async delete<P extends ObjectPath<V>>(key: P): Promise<boolean> {
+    public async delete<P extends ObjectPath<V>>(key: AutocompletableString<P>): Promise<boolean> {
         const allDatabase = this.all()
 
         if (!this.has(key)) {
@@ -654,7 +655,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be a number.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @param {number} numberToAdd The number to add to the target number in database.
      * @returns {Promise<number>} Addition operation result.
      *
@@ -675,7 +676,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    points: 5
      * // }
      */
-    public async add<P extends ObjectPath<V>>(key: P, numberToAdd: number): Promise<number> {
+    public async add<P extends ObjectPath<V>>(key: AutocompletableString<P>, numberToAdd: number): Promise<number> {
         const targetNumber = this.get(key) ?? 0 as any
 
         if (!isNumber(targetNumber)) {
@@ -699,7 +700,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be a number.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @param {number} numberToSubtract The number to subtract from the target number in database.
      * @returns {Promise<number>} Subtraction operation result.
      *
@@ -720,7 +721,10 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    points: 10
      * // }
      */
-    public async subtract<P extends ObjectPath<V>>(key: P, numberToSubtract: number): Promise<number> {
+    public async subtract<P extends ObjectPath<V>>(
+        key: AutocompletableString<P>,
+        numberToSubtract: number
+    ): Promise<number> {
         const targetNumber: any = this.get(key) ?? 0
 
         if (!isNumber(targetNumber)) {
@@ -742,7 +746,7 @@ export class QuickMongo<K extends string = string, V = any> {
     /**
      * Determines whether the specified target is an array.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {boolean} Whether the target is an array.
      *
      * @example
@@ -758,7 +762,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    notArray: 123
      * // }
      */
-    public isTargetArray<P extends ObjectPath<V>>(key: P): boolean {
+    public isTargetArray<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean {
         const target = this.get(key)
         return Array.isArray(target)
     }
@@ -766,7 +770,7 @@ export class QuickMongo<K extends string = string, V = any> {
     /**
      * Determines whether the specified target is a number.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {boolean} Whether the target is a number.
      *
      * @example
@@ -782,7 +786,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * //    notNumber: []
      * // }
      */
-    public isTargetNumber<P extends ObjectPath<V>>(key: P): boolean {
+    public isTargetNumber<P extends ObjectPath<V>>(key: AutocompletableString<P>): boolean {
         const target = this.get(key)
         return isNumber(target)
     }
@@ -792,7 +796,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be an array.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @param {RestOrArray<ExtractFromArray<ObjectValue<V, P>>>} values
      * The value(s) to be pushed into the target array in database.
      *
@@ -813,7 +817,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * // }
      */
     public async push<P extends ObjectPath<V>>(
-        key: P,
+        key: AutocompletableString<P>,
         ...values: RestOrArray<ExtractFromArray<ObjectValue<V, P>>>
     ): Promise<ExtractFromArray<ObjectValue<V, P>>[]> {
         const targetArray = this.get(key) || []
@@ -837,7 +841,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be an array.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @param {number} targetArrayElementIndex The index to find the element in target array by.
      * @param {V} value The value to be pushed into the target array in database.
      * @returns {Promise<Array<ExtractFromArray<ObjectValue<V, P>>>>} Updated target array from database.
@@ -852,7 +856,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * // }
      */
     public async pull<P extends ObjectPath<V>>(
-        key: P,
+        key: AutocompletableString<P>,
         targetArrayElementIndex: number,
         value: ObjectValue<V, P>
     ): Promise<ExtractFromArray<ObjectValue<V, P>>[]> {
@@ -889,7 +893,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be an array.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @param {RestOrArray<ExtractFromArray<number>>} targetArrayElementIndexes
      * The index(es) to find the element(s) in target array by.
      *
@@ -909,7 +913,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * // }
      */
     public async pop<P extends ObjectPath<V>>(
-        key: P,
+        key: AutocompletableString<P>,
         ...targetArrayElementIndexes: RestOrArray<ExtractFromArray<number>>
     ): Promise<ExtractFromArray<ObjectValue<V, P>>[]> {
         const targetArray = this.get(key) ?? []
@@ -1057,7 +1061,7 @@ export class QuickMongo<K extends string = string, V = any> {
      *
      * [!!!] The type of target value must be an array.
      *
-     * @param {P} key The key to access the target in database by.
+     * @param {AutocompletableString<P>} key The key to access the target in database by.
      * @returns {Maybe<ObjectValue<V, P>>} The randomly picked element in the database array.
      *
      * @example
@@ -1067,7 +1071,7 @@ export class QuickMongo<K extends string = string, V = any> {
      * const randomArrayElement = quickMongo.random('exampleArray')
      * console.log(randomArrayElement) // -> randomly picked array element: either 'example1', 'example2', or 'example3'
      */
-    public random<P extends ObjectPath<V>>(key: P): Maybe<ObjectValue<V, P>> {
+    public random<P extends ObjectPath<V>>(key: AutocompletableString<P>): Maybe<ObjectValue<V, P>> {
         const array = this.get(key)
 
         if (!Array.isArray(array)) {
diff --git a/src/types/utils.ts b/src/types/utils.ts
index 6bff5a1..c512e6d 100644
--- a/src/types/utils.ts
+++ b/src/types/utils.ts
@@ -152,6 +152,17 @@ export type ExtractObjectEntries<T extends Record<string, any>> = [ExtractObject
  */
 export type IsAny<T> = 0 extends (1 & T) ? true : false
 
+/**
+ * Makes the string union type autocompletable with a `string` type.
+ *
+ * Type parameters:
+ *
+ * - `S` (`string`) - The autocompletable union string type to make compatible with a `string` type.
+ *
+ * @template S - The autocompletable union string type to make compatible with a `string` type.
+ */
+export type AutocompletableString<S extends string> = S | (string & {})
+
 /**
  * Extracts the first key from the specified object path.
  * (for example, in key `member.user.id`, the first key will be `member`)
diff --git a/tests/types-test.ts b/tests/types-test.ts
index 1b3cbef..21f8baa 100644
--- a/tests/types-test.ts
+++ b/tests/types-test.ts
@@ -67,17 +67,15 @@ quickMongo.get('nested.nested2')
 quickMongo.get('nested.nested3')
 quickMongo.get('nested.nested3.nested31')
 quickMongo.get('nested.nested3.nested32')
-quickMongo1.get('test')
-quickMongo1.get('sdfsdfsdf')
-
-// @ts-expect-error
+quickMongo.get('test')
+quickMongo.get('sdfsdfsdf')
 quickMongo.get('sdfsdfsdf')
-// @ts-expect-error
 quickMongo.get('nested123')
-// @ts-expect-error
 quickMongo.get('nested.nested3.asdasdasd')
-// @ts-expect-error
 quickMongo.get('nested.nested2.nested31')
+quickMongo1.get('test')
+quickMongo1.get('sdfsdfsdf')
+
 // @ts-expect-error
 quickMongo.get(123)
 // @ts-expect-error
@@ -102,7 +100,6 @@ quickMongo.set('nested.nested3', {
 quickMongo.set('nested.nested3.nested31', 'asdasdasd')
 quickMongo.set('nested.nested3.nested32', 123)
 
-
 // @ts-expect-error
 quickMongo.set('name', 123)
 // @ts-expect-error