diff --git a/code/checks/FileAccessibilityAndValidationCheck.php b/code/checks/FileAccessibilityAndValidationCheck.php
new file mode 100644
index 0000000..c7257a0
--- /dev/null
+++ b/code/checks/FileAccessibilityAndValidationCheck.php
@@ -0,0 +1,145 @@
+<?php
+/**
+ * Checks for the accessiblility and tiletype validation of one or more files or folders.
+ *
+ * Examples:
+ * // Checks /assets/caluclator_files has .json files and all files are valid json files.
+	* EnvironmentCheckSuite::register('check', 'FileAccessibilityAndValidationCheck("' . BASE_PATH . '/assets/caluclator_files/*.json",
+ *  "jsonValidate", '.FileAccessibilityAndValidationCheck::CHECK_ALL.')', 'Check a json file exist and are all valid json files'
+ * );
+ * 
+ * // Checks /assets/caluclator_files/calculator.json exists and is valid json file.
+ * EnvironmentCheckSuite::register('check', 'FileAccessibilityAndValidationCheck("' . BASE_PATH . '/assets/caluclator_files/calculator.json",
+ *  "jsonValidate", '.FileAccessibilityAndValidationCheck::CHECK_SINGLE.')', 'Check a calculator.json exists and is valid json file'
+ * );
+ *
+ * // Check only existence 
+ * EnvironmentCheckSuite::register('check', 'FileAccessibilityAndValidationCheck("' . BASE_PATH . '/assets/caluclator_files/calculator.json")', 
+ * 'Check a calculator.json exists only'
+ * );
+ */
+class FileAccessibilityAndValidationCheck implements EnvironmentCheck {
+
+	const CHECK_SINGLE = 1;
+
+	const CHECK_ALL = 2;
+
+	/**
+	 * @var String Absolute path to a file or folder, compatible with glob().
+	 */
+	protected $path;
+
+	/**
+	 * @var Int Constant, check for a single file to match age criteria, or all of them.
+	 */
+	protected $fileTypeValidateFunc;
+
+		/**
+	 * @var Int Constant, check for a single file to match age criteria, or all of them.
+	 */
+	protected $checkType;
+
+	function __construct($path, $fileTypeValidateFunc = 'noVidation', $checkType = null) {
+		$this->path = $path;
+		$this->fileTypeValidateFunc = ($fileTypeValidateFunc)? $fileTypeValidateFunc:'noVidation';
+		$this->checkType = ($checkType) ? $checkType : self::CHECK_SINGLE;
+	}
+
+	function check() {
+		$origStage = Versioned::get_reading_mode();
+		Versioned::set_reading_mode('Live');
+
+		$files = $this->getFiles();
+		if($files){
+			$fileTypeValidateFunc = $this->fileTypeValidateFunc;
+			if(method_exists ($this, $fileTypeValidateFunc)){
+				$invalidFiles = array();
+				$validFiles = array();
+
+				foreach($files as $file){
+					if($this->$fileTypeValidateFunc($file)){
+						$validFiles[] = $file;
+					}else{
+						$invalidFiles[] = $file;
+					}
+				}
+
+				// If at least one file was valid, count as passed
+				if($this->checkType == self::CHECK_SINGLE && count($invalidFiles) < count($files)) {
+					$validFileList = "\n";
+					foreach($validFiles as $vf){
+						$validFileList .= $vf."\n";
+					}
+					if($fileTypeValidateFunc == 'noVidation') {
+						$checkReturn = array(
+							EnvironmentCheck::OK,
+							sprintf('At least these file(s) accessible: %s', $validFileList)
+						);
+					}else{
+						$checkReturn = array(
+							EnvironmentCheck::OK,
+							sprintf('At least these file(s) passed file type validate function "%s": %s', $fileTypeValidateFunc, $validFileList)
+						);
+					}
+				} else {
+					if (count($invalidFiles) == 0) $checkReturn = array(EnvironmentCheck::OK, 'All files valideted');
+					else {
+						$invalidFileList = "\n";
+						foreach($invalidFiles as $vf){
+							$invalidFileList .= $vf."\n";
+						}
+
+						if($fileTypeValidateFunc == 'noVidation'){
+							$checkReturn = array(
+								EnvironmentCheck::ERROR,
+								sprintf('File(s) not accessible: %s', $invalidFileList)
+							);
+						}else{
+							$checkReturn = array(
+								EnvironmentCheck::ERROR,
+								sprintf('File(s) not passing the file type validate function "%s": %s', $fileTypeValidateFunc, $invalidFileList)
+							);
+						}
+	
+					}
+				}
+			}else{
+				$checkReturn =  array(
+					EnvironmentCheck::ERROR,
+					sprintf("Invalid file type validation method name passed: %s ", $fileTypeValidateFunc)
+				);
+			}
+
+		}else{
+			$checkReturn = array(
+				EnvironmentCheck::ERROR,
+				sprintf("No files accessible at path %s", $this->path)
+			);
+		}
+
+		Versioned::set_reading_mode($origStage);
+
+		return $checkReturn;
+	}
+
+	private function jsonValidate($file){
+		$json = json_decode(file_get_contents($file));
+		if(!$json) {
+			return false;
+		}else{
+			return true;
+		}
+	}
+
+	protected function noVidation($file) {
+		return true;
+	}
+
+	/**
+	 * @return Array Of absolute file paths
+	 */
+	protected function getFiles() {
+		return glob($this->path);
+	}
+
+}
\ No newline at end of file