diff --git a/composer.json b/composer.json
index 94c839e..d35178a 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,9 @@
             "email": "jani@marketdistinctly.com"
         }
     ],
-    "require": {},
+    "require": {
+        "ext-json": "*"
+    },
     "require-dev": {
         "orchestra/testbench": "^3.7"
     },
diff --git a/src/Exceptions/FileDirectoryNotFoundException.php b/src/Exceptions/FileDirectoryNotFoundException.php
new file mode 100644
index 0000000..ba47abd
--- /dev/null
+++ b/src/Exceptions/FileDirectoryNotFoundException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace distinctm\LaravelDataSync\Exceptions;
+
+use Exception;
+
+class FileDirectoryNotFoundException extends Exception
+{
+    protected $message = 'Specified sync file directory does not exist';
+}
\ No newline at end of file
diff --git a/src/Exceptions/NoCriteriaException.php b/src/Exceptions/NoCriteriaException.php
new file mode 100644
index 0000000..e5368d7
--- /dev/null
+++ b/src/Exceptions/NoCriteriaException.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace distinctm\LaravelDataSync\Exceptions;
+
+use Exception;
+
+class NoCriteriaException extends Exception
+{
+    protected $message = 'No criteria/attributes detected';
+}
\ No newline at end of file
diff --git a/src/Exceptions/NoRecordsInvalidJSONException.php b/src/Exceptions/NoRecordsInvalidJSONException.php
new file mode 100644
index 0000000..a59aac8
--- /dev/null
+++ b/src/Exceptions/NoRecordsInvalidJSONException.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace distinctm\LaravelDataSync\Exceptions;
+
+use Exception;
+use Throwable;
+
+class NoRecordsInvalidJSONException extends Exception
+{
+    public function __construct(string $message = "", int $code = 0, Throwable $previous = null)
+    {
+        parent::__construct($message, $code, $previous);
+
+        $this->message = "No records or invalid JSON for {$message} model.";
+    }
+}
\ No newline at end of file
diff --git a/src/Updater.php b/src/Updater.php
index 8436524..e83ad4e 100644
--- a/src/Updater.php
+++ b/src/Updater.php
@@ -2,16 +2,21 @@
 
 namespace distinctm\LaravelDataSync;
 
+use distinctm\LaravelDataSync\Exceptions\FileDirectoryNotFoundException;
+use distinctm\LaravelDataSync\Exceptions\NoCriteriaException;
+use distinctm\LaravelDataSync\Exceptions\NoRecordsInvalidJSONException;
+use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\File;
-use Illuminate\Support\Facades\Schema;
 
 class Updater
 {
-
     /**
      * Get files in sync directory
      *
      * @param string|null $path
+     * @param string|null $model
+     *
+     * @throws \distinctm\LaravelDataSync\Exceptions\FileDirectoryNotFoundException
      */
     public function __construct($path = null, $model = null)
     {
@@ -22,11 +27,11 @@ public function __construct($path = null, $model = null)
     /**
      * Execute syncModel for each file
      *
-     * @return void
+     * @return mixed
      */
     public function run()
     {
-        $records = collect($this->files)->map(function($file) {
+        $records = collect($this->files)->map(function ($file) {
             return $this->syncModel($file);
         });
 
@@ -37,14 +42,16 @@ public function run()
      * Parse each record for criteria/values and update/create model
      *
      * @param string $file
+     *
      * @return \Illuminate\Support\Collection
+     * @throws \distinctm\LaravelDataSync\Exceptions\NoRecordsInvalidJSONException
      */
     protected function syncModel(string $file)
     {
         $model = $this->getModel($file);
         $records = $this->getRecords($file);
 
-        $records->each(function($record) use ($model) {
+        $records->each(function ($record) use ($model) {
             $criteria = $this->resolveObjects(
                 $this->getCriteria($record)
             );
@@ -62,15 +69,17 @@ protected function syncModel(string $file)
     /**
      * Get directory path for sync files
      *
-     * @param object $record
+     * @param $path
+     *
      * @return array
+     * @throws \distinctm\LaravelDataSync\Exceptions\FileDirectoryNotFoundException
      */
     protected function getDirectory($path)
     {
         $directory = $path ?? config('data-sync.path', base_path('sync'));
 
-        if(!file_exists($directory)) {
-            throw new \Exception("Specified sync file directory does not exist");
+        if (!file_exists($directory)) {
+            throw new FileDirectoryNotFoundException;
         }
 
         return $directory;
@@ -80,16 +89,17 @@ protected function getDirectory($path)
      * Get list of files in directory
      *
      * @param string $directory
-     * @param string\null $model
-     * @return array
+     * @param string|null $model
+     *
+     * @return array|string
      */
     protected function getFiles(string $directory, $model)
     {
-        if($model) {
+        if ($model) {
             return $directory . '/' . $model . '.json';
         }
 
-        return collect(File::files($directory))->map(function($path) {
+        return collect(File::files($directory))->map(function ($path) {
             return $path->getPathname();
         })->toArray();
     }
@@ -98,19 +108,21 @@ protected function getFiles(string $directory, $model)
      * Filter record criteria
      *
      * @param object $record
+     *
      * @return array
+     * @throws \distinctm\LaravelDataSync\Exceptions\NoCriteriaException
      */
     protected function getCriteria(object $record)
     {
-        $criteria = collect($record)->filter(function($value, $key) {
+        $criteria = collect($record)->filter(function ($value, $key) {
             return $this->isCriteria($key);
         });
 
-        if($criteria->count() == 0) {
-            throw new \Exception("No criteria/attributes detected");
+        if ($criteria->count() == 0) {
+            throw new NoCriteriaException;
         }
 
-        return $criteria->mapWithKeys(function($value, $key) {
+        return $criteria->mapWithKeys(function ($value, $key) {
             return [substr($key, 1) => $value];
         });
     }
@@ -119,16 +131,17 @@ protected function getCriteria(object $record)
      * Filter record values
      *
      * @param object $record
+     *
      * @return array
      */
     protected function getValues(object $record)
     {
-        return collect($record)->reject(function($value, $key) {
-            if($this->isCriteria($key)) {
+        return collect($record)->reject(function ($value, $key) {
+            if ($this->isCriteria($key)) {
                 return true;
             }
 
-            if(empty($value)) {
+            if (empty($value)) {
                 return true;
             }
 
@@ -139,7 +152,8 @@ protected function getValues(object $record)
     /**
      * Returns model name for file
      *
-     * @param string $file
+     * @param string $name
+     *
      * @return string
      */
     protected function getModel(string $name)
@@ -151,14 +165,16 @@ protected function getModel(string $name)
      * Parses JSON from file and returns collection
      *
      * @param string $file
+     *
      * @return \Illuminate\Support\Collection
+     * @throws \distinctm\LaravelDataSync\Exceptions\NoRecordsInvalidJSONException
      */
     protected function getRecords(string $file)
     {
         $records = collect(json_decode(File::get($file)));
 
-        if($records->isEmpty()) {
-            throw new \Exception("No records or invalid JSON for {$file} model");
+        if ($records->isEmpty()) {
+            throw new NoRecordsInvalidJSONException($file);
         }
 
         return $records;
@@ -168,6 +184,7 @@ protected function getRecords(string $file)
      * Check if column is criteria for a condition match
      *
      * @param string $key
+     *
      * @return boolean
      */
     protected function isCriteria($key)
@@ -180,15 +197,16 @@ protected function isCriteria($key)
      *
      * @param string $key
      * @param object $values
+     *
      * @return array
      */
     protected function resolveId(string $key, object $values)
     {
         $model = $this->getModel($key);
-        
-        $values = collect($values)->mapWithKeys(function($value, $column) {
 
-            if(is_object($value)) {
+        $values = collect($values)->mapWithKeys(function ($value, $column) {
+
+            if (is_object($value)) {
                 return $this->resolveId($column, $value);
             }
 
@@ -201,13 +219,14 @@ protected function resolveId(string $key, object $values)
     /**
      * Detect nested objects and resolve them
      *
-     * @param \Illuminate\Support\Collection $records
+     * @param \Illuminate\Support\Collection $record
+     *
      * @return array
      */
-    protected function resolveObjects(\Illuminate\Support\Collection $record)
+    protected function resolveObjects(Collection $record)
     {
-        return $record->mapWithKeys(function($value, $key) {
-            if(is_object($value)) {
+        return $record->mapWithKeys(function ($value, $key) {
+            if (is_object($value)) {
                 return $this->resolveId($key, $value);
             }