diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3b1bf4..6c2f52d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,12 +4,14 @@ by [**SWR Audio Lab**](https://lab.swr.de/)
 
 ## Changelog
 
+- 2022-01-31 - v1.0.1-beta
+  - feat: add string helpers
+
 - 2022-01-26 - v1.0.0-beta
   - chore!: folder migration
   - refactor: swap node-fetch for undici
   - feat: add ard publisher script
   - feat: add ard category parser
-  - feat: add string helpers
 
 - 2021-08-11 - v0.2.3
   - updated dependencies
diff --git a/package.json b/package.json
index 47bfd84..f59261a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "@swrlab/utils",
-	"version": "1.0.0-beta",
+	"version": "1.0.1-beta",
 	"description": "Wrapping common SWR Audio Lab utils",
 	"main": "./src/index.js",
 	"engines": {
@@ -21,7 +21,7 @@
 	"private": false,
 	"dependencies": {
 		"@google-cloud/storage": "5.18.0",
-		"aws-sdk": "2.1062.0",
+		"aws-sdk": "2.1063.0",
 		"node-crc": "^1.3.2",
 		"undici-wrapper": "frytg/undici-wrapper#v0.0.3",
 		"uuid": "8.3.2"
@@ -29,7 +29,7 @@
 	"devDependencies": {
 		"@swrlab/eslint-plugin-swr": "0.1.2",
 		"@swrlab/swr-prettier-config": "0.1.2",
-		"dotenv": "^14.2.0",
+		"dotenv": "^14.3.2",
 		"eslint": "8.7.0",
 		"prettier": "^2.5.1"
 	},
diff --git a/packages/strings/README.md b/packages/strings/README.md
index fac61d5..5fbef5f 100644
--- a/packages/strings/README.md
+++ b/packages/strings/README.md
@@ -4,9 +4,17 @@ Common string, array, object encoding and getter helpers.
 
 - [SWR Audio Lab / Strings, Arrays, Objects](#swr-audio-lab--strings-arrays-objects)
   - [Install](#install)
-  - [`isArray` - Check if a value is a proper array](#isarray---check-if-a-value-is-a-proper-array)
-  - [`isIncluded` - Check if a value (haystack) includes another value (needle)](#isincluded---check-if-a-value-haystack-includes-another-value-needle)
+  - [`getObjectLength` - get the length of an object](#getobjectlength---get-the-length-of-an-object)
+  - [`isArray` - check if a value is a proper array](#isarray---check-if-a-value-is-a-proper-array)
+  - [`isEmptyArray` - check if a value is an empty array](#isemptyarray---check-if-a-value-is-an-empty-array)
+  - [`isEmptyObject` - check if a value is an empty object](#isemptyobject---check-if-a-value-is-an-empty-object)
+  - [`isIncluded` - check if a value (haystack) includes another value (needle)](#isincluded---check-if-a-value-haystack-includes-another-value-needle)
+  - [`isNull` - check if a value is null](#isnull---check-if-a-value-is-null)
   - [`isObject` - check if a value is a proper object](#isobject---check-if-a-value-is-a-proper-object)
+  - [`isUndefined` - check if a value is undefined](#isundefined---check-if-a-value-is-undefined)
+  - [`notEmptyArray` - check if a value is not an empty array](#notemptyarray---check-if-a-value-is-not-an-empty-array)
+  - [`notEmptyObject` - check if a value is not an empty object](#notemptyobject---check-if-a-value-is-not-an-empty-object)
+  - [`notNullOrUndefined` - check if a value is neither null nor undefined](#notnullorundefined---check-if-a-value-is-neither-null-nor-undefined)
   - [`removeDoubleSpaces` - take a string and remove its duplicate spaces](#removedoublespaces---take-a-string-and-remove-its-duplicate-spaces)
   - [`toHex` - take a string convert it to a hex string](#tohex---take-a-string-convert-it-to-a-hex-string)
 
@@ -18,7 +26,27 @@ Add the parent package to your dependencies:
 yarn add @swrlab/utils
 ```
 
-## `isArray` - Check if a value is a proper array
+## `getObjectLength` - get the length of an object
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { getObjectLength } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+getObjectLength({ hello: 'world' })
+// 1
+
+getObjectLength({ hello: 'world', foo: 'bar' })
+// 2
+```
+
+## `isArray` - check if a value is a proper array
 
 - `value` (required) - Value to check
 
@@ -38,7 +66,47 @@ isArray('hello world')
 // false
 ```
 
-## `isIncluded` - Check if a value (haystack) includes another value (needle)
+## `isEmptyArray` - check if a value is an empty array
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { isEmptyArray } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+isEmptyArray([])
+// true
+
+isEmptyArray(['hello world'])
+// false
+```
+
+## `isEmptyObject` - check if a value is an empty object
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { isEmptyObject } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+isEmptyObject({})
+// true
+
+isEmptyObject({ hello: 'world' })
+// false
+```
+
+## `isIncluded` - check if a value (haystack) includes another value (needle)
 
 - `haystack` (required) - Array or value to check
 - `needle` (required) - Array or value to check
@@ -59,6 +127,26 @@ isIncluded('hello world', 'earth')
 // false
 ```
 
+## `isNull` - check if a value is null
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { isNull } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+isNull(null)
+// true
+
+isNull(undefined)
+// false
+```
+
 ## `isObject` - check if a value is a proper object
 
 - `value` (required) - Value to check
@@ -79,6 +167,89 @@ isObject('hello world')
 // false
 ```
 
+## `isUndefined` - check if a value is undefined
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { isUndefined } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+isUndefined(undefined)
+// true
+
+isUndefined(null)
+// false
+```
+
+## `notEmptyArray` - check if a value is not an empty array
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { notEmptyArray } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+notEmptyArray(['hello world'])
+// true
+
+notEmptyArray([])
+// false
+```
+
+## `notEmptyObject` - check if a value is not an empty object
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { notEmptyObject } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+notEmptyObject({ hello: 'world' })
+// true
+
+notEmptyObject({})
+// false
+```
+
+## `notNullOrUndefined` - check if a value is neither null nor undefined
+
+- `value` (required) - Value to check
+
+Import the library:
+
+```js
+const { notNullOrUndefined } = require('@swrlab/utils/packages/strings')
+```
+
+Then use the toolkit:
+
+```js
+notNullOrUndefined('hello world')
+// true
+
+notNullOrUndefined(null)
+// false
+
+notNullOrUndefined(undefined)
+// false
+```
+
 ## `removeDoubleSpaces` - take a string and remove its duplicate spaces
 
 - `value` (required) - Value to convert
diff --git a/packages/strings/index.js b/packages/strings/index.js
index 7e214e9..c832183 100644
--- a/packages/strings/index.js
+++ b/packages/strings/index.js
@@ -1,15 +1,31 @@
 // import packages
+const getObjectLength = require('../../utils/strings/getObjectLength')
 const isArray = require('../../utils/strings/isArray')
+const isEmptyArray = require('../../utils/strings/isEmptyArray')
+const isEmptyObject = require('../../utils/strings/isEmptyObject')
 const isIncluded = require('../../utils/strings/isIncluded')
+const isNull = require('../../utils/strings/isNull')
 const isObject = require('../../utils/strings/isObject')
+const isUndefined = require('../../utils/strings/isUndefined')
+const notEmptyArray = require('../../utils/strings/notEmptyArray')
+const notEmptyObject = require('../../utils/strings/notEmptyObject')
+const notNullOrUndefined = require('../../utils/strings/notNullOrUndefined')
 const removeDoubleSpaces = require('../../utils/strings/removeDoubleSpaces')
 const toHex = require('../../utils/strings/toHex')
 
 // export packages
 module.exports = {
+	getObjectLength,
 	isArray,
+	isEmptyArray,
+	isEmptyObject,
 	isIncluded,
+	isNull,
 	isObject,
+	isUndefined,
+	notEmptyArray,
+	notEmptyObject,
+	notNullOrUndefined,
 	removeDoubleSpaces,
 	toHex,
 }
diff --git a/utils/strings/getObjectLength.js b/utils/strings/getObjectLength.js
new file mode 100644
index 0000000..fdf73d7
--- /dev/null
+++ b/utils/strings/getObjectLength.js
@@ -0,0 +1,2 @@
+// get the length (count of keys) of an object
+module.exports = (value) => value && Object.keys(value).length
diff --git a/utils/strings/isArray.js b/utils/strings/isArray.js
index 3a05411..4ea4453 100644
--- a/utils/strings/isArray.js
+++ b/utils/strings/isArray.js
@@ -1,2 +1,4 @@
+const notNullOrUndefined = require('./notNullOrUndefined')
+
 // check if a variable is really an array
-module.exports = (value) => !!(value instanceof Array)
+module.exports = (value) => notNullOrUndefined(value) && value instanceof Array
diff --git a/utils/strings/isEmptyArray.js b/utils/strings/isEmptyArray.js
new file mode 100644
index 0000000..6595737
--- /dev/null
+++ b/utils/strings/isEmptyArray.js
@@ -0,0 +1,4 @@
+const isArray = require('./isArray')
+
+// check if a variable is an empty array
+module.exports = (value) => isArray(value) && value.length === 0
diff --git a/utils/strings/isEmptyObject.js b/utils/strings/isEmptyObject.js
new file mode 100644
index 0000000..cc4ec28
--- /dev/null
+++ b/utils/strings/isEmptyObject.js
@@ -0,0 +1,5 @@
+const isObject = require('./isObject')
+const getObjectLength = require('./getObjectLength')
+
+// check if a variable is an empty object
+module.exports = (value) => isObject(value) && getObjectLength(value) === 0
diff --git a/utils/strings/isNull.js b/utils/strings/isNull.js
new file mode 100644
index 0000000..9e32efe
--- /dev/null
+++ b/utils/strings/isNull.js
@@ -0,0 +1,2 @@
+// check if a variable is null
+module.exports = (value) => value === null
diff --git a/utils/strings/isObject.js b/utils/strings/isObject.js
index c3c26d5..086ace1 100644
--- a/utils/strings/isObject.js
+++ b/utils/strings/isObject.js
@@ -1,5 +1,6 @@
 // import utils
 const isArray = require('./isArray')
+const notNullOrUndefined = require('./notNullOrUndefined')
 
 // check if a variable is really an object
-module.exports = (value) => value instanceof Object && !isArray(value)
+module.exports = (value) => notNullOrUndefined(value) && value instanceof Object && !isArray(value)
diff --git a/utils/strings/isUndefined.js b/utils/strings/isUndefined.js
new file mode 100644
index 0000000..ff200a6
--- /dev/null
+++ b/utils/strings/isUndefined.js
@@ -0,0 +1,2 @@
+// check if a variable is undefined
+module.exports = (value) => value === undefined
diff --git a/utils/strings/notEmptyArray.js b/utils/strings/notEmptyArray.js
new file mode 100644
index 0000000..d4b88b6
--- /dev/null
+++ b/utils/strings/notEmptyArray.js
@@ -0,0 +1,4 @@
+const isArray = require('./isArray')
+
+// check if a variable is an empty array
+module.exports = (value) => isArray(value) && value.length > 0
diff --git a/utils/strings/notEmptyObject.js b/utils/strings/notEmptyObject.js
new file mode 100644
index 0000000..803a15e
--- /dev/null
+++ b/utils/strings/notEmptyObject.js
@@ -0,0 +1,5 @@
+const isObject = require('./isObject')
+const getObjectLength = require('./getObjectLength')
+
+// check if a variable is an empty object
+module.exports = (value) => isObject(value) && getObjectLength(value) > 0
diff --git a/utils/strings/notNullOrUndefined.js b/utils/strings/notNullOrUndefined.js
new file mode 100644
index 0000000..44e45aa
--- /dev/null
+++ b/utils/strings/notNullOrUndefined.js
@@ -0,0 +1,5 @@
+const isNull = require('./isNull')
+const isUndefined = require('./isUndefined')
+
+// check if a variable is neither null nor undefined
+module.exports = (value) => !isNull(value) && !isUndefined(value)
diff --git a/yarn.lock b/yarn.lock
index e5f7f08..f193d94 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -418,10 +418,10 @@ async-retry@^1.3.3:
   dependencies:
     retry "0.13.1"
 
-aws-sdk@2.1062.0:
-  version "2.1062.0"
-  resolved "https://registry.yarnpkg.com/aws-sdk/-/aws-sdk-2.1062.0.tgz#89b55c9dcfa15135910a217489eb8577b11d9899"
-  integrity sha512-QIU8jwi7Uqyvw2HjsXXXUZv3V/6TinUzLewrdl2EdvonqZCXhwMgnZx2F9I2x62IKH1RqnINwFWdoK+OTgcAjA==
+aws-sdk@2.1063.0:
+  version "2.1063.0"
+  resolved "https://registry.yarnpkg.com/aws-sdk/-/aws-sdk-2.1063.0.tgz#ab5e7f69955358a48be345ee3d76667a68f61dd6"
+  integrity sha512-UonfKdsDChKEmAkFuDOQ8zeilvR5v7d5dEcWDy+fnKBs+6HGjDThMf7EofhOiKxOXWnFhrAsFKCsKDcfeA6NBg==
   dependencies:
     buffer "4.9.2"
     events "1.1.1"
@@ -673,10 +673,10 @@ dot-prop@^5.2.0:
   dependencies:
     is-obj "^2.0.0"
 
-dotenv@^14.2.0:
-  version "14.3.0"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-14.3.0.tgz#40f537fe90e229d35361c66cf432903e0db49001"
-  integrity sha512-PCTcOQSXVo9FI1dB7AichJXMEvmiGCq0gnCpjfDUc8505uR+2MeLXWe+Ue4PN5UXa2isHSa78sr7L59fk+2mnQ==
+dotenv@^14.3.2:
+  version "14.3.2"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-14.3.2.tgz#7c30b3a5f777c79a3429cb2db358eef6751e8369"
+  integrity sha512-vwEppIphpFdvaMCaHfCEv9IgwcxMljMw2TnAQBB4VWPvzXQLTb82jwmdOKzlEVUL3gNFT4l4TPKO+Bn+sqcrVQ==
 
 duplexify@^4.0.0, duplexify@^4.1.1:
   version "4.1.2"