diff --git a/src/Contract.php b/src/Contract.php
index 34efd31..002b068 100644
--- a/src/Contract.php
+++ b/src/Contract.php
@@ -115,9 +115,18 @@ class Contract
         } else if ($provider instanceof Provider) {
             $this->provider = $provider;
         }
-        $abi = Utils::jsonToArray($abi, 5);
 
-        foreach ($abi as $item) {
+        $abiArray = [];
+        if (is_string($abi)) {
+            $abiArray = json_decode($abi, true);
+
+            if (JSON_ERROR_NONE !== json_last_error()) {
+                throw new InvalidArgumentException('abi decode error: ' . json_last_error_msg());
+            }
+        } else {
+            $abiArray = Utils::jsonToArray($abi);
+        }
+        foreach ($abiArray as $item) {
             if (isset($item['type'])) {
                 if ($item['type'] === 'function') {
                     $this->functions[$item['name']] = $item;
@@ -128,7 +137,7 @@ class Contract
                 }
             }
         }
-        $this->abi = $abi;
+        $this->abi = $abiArray;
         $this->eth = new Eth($this->provider);
         $this->ethabi = new Ethabi([
             'address' => new Address,
@@ -359,9 +368,18 @@ class Contract
         if (StringValidator::validate($abi) === false) {
             throw new InvalidArgumentException('Please make sure abi is valid.');
         }
-        $abi = Utils::jsonToArray($abi, 5);
+        $abiArray = [];
+        if (is_string($abi)) {
+            $abiArray = json_decode($abi, true);
 
-        foreach ($abi as $item) {
+            if (JSON_ERROR_NONE !== json_last_error()) {
+                throw new InvalidArgumentException('abi decode error: ' . json_last_error_msg());
+            }
+        } else {
+            $abiArray = Utils::jsonToArray($abi);
+        }
+
+        foreach ($abiArray as $item) {
             if (isset($item['type'])) {
                 if ($item['type'] === 'function') {
                     $this->functions[$item['name']] = $item;
@@ -372,7 +390,7 @@ class Contract
                 }
             }
         }
-        $this->abi = $abi;
+        $this->abi = $abiArray;
 
         return $this;
     }
diff --git a/src/Utils.php b/src/Utils.php
index 49cd4d3..4f9b6ef 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -422,52 +422,34 @@ class Utils
     /**
      * jsonToArray
      * 
-     * @param stdClass|array|string $json
-     * @param int $depth
+     * @param stdClass|array $json
      * @return array
      */
-    public static function jsonToArray($json, $depth=1)
+    public static function jsonToArray($json)
     {
-        if (!is_int($depth) || $depth <= 0) {
-            throw new InvalidArgumentException('jsonToArray depth must be int and depth must bigger than 0.');
-        }
         if ($json instanceof stdClass) {
             $json = (array) $json;
             $typeName = [];
 
-            if ($depth > 1) {
-                foreach ($json as $key => $param) {
-                    if (is_array($param)) {
-                        foreach ($param as $subKey => $subParam) {
-                            $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
-                        }
-                    } elseif ($param instanceof stdClass) {
-                        $json[$key] = self::jsonToArray($param, $depth-1);
+            foreach ($json as $key => $param) {
+                if (is_array($param)) {
+                    foreach ($param as $subKey => $subParam) {
+                        $json[$key][$subKey] = self::jsonToArray($subParam);
                     }
+                } elseif ($param instanceof stdClass) {
+                    $json[$key] = self::jsonToArray($param);
                 }
             }
-            return $json;
         } elseif (is_array($json)) {
-            if ($depth > 1) {
-                foreach ($json as $key => $param) {
-                    if (is_array($param)) {
-                        foreach ($param as $subKey => $subParam) {
-                            $json[$key][$subKey] = self::jsonToArray($subParam, $depth-1);
-                        }
-                    } elseif ($param instanceof stdClass) {
-                        $json[$key] = self::jsonToArray($param, $depth-1);
+            foreach ($json as $key => $param) {
+                if (is_array($param)) {
+                    foreach ($param as $subKey => $subParam) {
+                        $json[$key][$subKey] = self::jsonToArray($subParam);
                     }
+                } elseif ($param instanceof stdClass) {
+                    $json[$key] = self::jsonToArray($param);
                 }
             }
-        } elseif (is_string($json)) {
-            $json = json_decode($json, true);
-
-            if (JSON_ERROR_NONE !== json_last_error()) {
-                throw new InvalidArgumentException('json_decode error: ' . json_last_error_msg());
-            }
-            return $json;
-        } else {
-            throw new InvalidArgumentException('The json param to jsonToArray must be array or stdClass or string.');
         }
         return $json;
     }
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index 1eb3181..37302e5 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -7,6 +7,7 @@ use stdClass;
 use Test\TestCase;
 use phpseclib\Math\BigInteger as BigNumber;
 use Web3\Utils;
+use Web3\Contract;
 
 class UtilsTest extends TestCase
 {
@@ -52,6 +53,85 @@ class UtilsTest extends TestCase
       }
     }';
 
+    /**
+     * testIssue112Json
+     * see: https://github.com/sc0Vu/web3.php/issues/112
+     * 
+     * @var string
+     */
+    protected $testIssue112Json = '[
+        {
+          "constant": true,
+          "inputs": [],
+          "name": "name",
+          "outputs": [
+            {
+              "name": "",
+              "type": "string"
+            }
+          ],
+          "payable": false,
+          "stateMutability": "view",
+          "type": "function"
+        },
+        {
+          "constant": true,
+          "inputs": [],
+          "name": "decimals",
+          "outputs": [
+            {
+              "name": "",
+              "type": "uint256"
+            }
+          ],
+          "payable": false,
+          "stateMutability": "view",
+          "type": "function"
+        },
+        {
+          "constant": true,
+          "inputs": [
+            {
+              "name": "tokenOwner",
+              "type": "address"
+            }
+          ],
+          "name": "balanceOf",
+          "outputs": [
+            {
+              "name": "balance",
+              "type": "uint256"
+            }
+          ],
+          "payable": false,
+          "stateMutability": "view",
+          "type": "function"
+        },
+        {
+          "constant": false,
+          "inputs": [
+            {
+              "name": "to",
+              "type": "address"
+            },
+            {
+              "name": "tokens",
+              "type": "uint256"
+            }
+          ],
+          "name": "transfer",
+          "outputs": [
+            {
+              "name": "success",
+              "type": "bool"
+            }
+          ],
+          "payable": false,
+          "stateMutability": "nonpayable",
+          "type": "function"
+        }
+    ]';
+
     /**
      * setUp
      * 
@@ -418,39 +498,16 @@ class UtilsTest extends TestCase
      */
     public function testJsonToArray()
     {
-        $json = json_decode($this->testJsonMethodString);
-        $jsonArrayDepth1 = Utils::jsonToArray($json);
-
-        $this->assertEquals($jsonArrayDepth1, (array) $json);
-
+        $decodedJson = json_decode($this->testJsonMethodString);
+        $jsonArray = Utils::jsonToArray($decodedJson);
         $jsonAssoc = json_decode($this->testJsonMethodString, true);
-        $jsonArrayDepth2 = Utils::jsonToArray($json, 2);
+        $jsonArray2 = Utils::jsonToArray($jsonAssoc);
+        $this->assertEquals($jsonAssoc, $jsonArray);
+        $this->assertEquals($jsonAssoc, $jsonArray2);
 
-        $this->assertEquals($jsonArrayDepth2, $jsonAssoc);
-
-        $jsonArrayDepth2 = Utils::jsonToArray($jsonArrayDepth1, 2);
-        $this->assertEquals($jsonArrayDepth2, $jsonAssoc);
-
-        $jsonArray = Utils::jsonToArray($this->testJsonMethodString);
-        $this->assertEquals($jsonArray, $jsonAssoc);
-
-        try {
-            $jsonArray = Utils::jsonToArray($json, 0);
-        } catch (InvalidArgumentException $e) {
-            $this->assertTrue($e !== null);
-        }
-
-        try {
-            $jsonArray = Utils::jsonToArray(mb_substr($this->testJsonMethodString, 0, 50), 1);
-        } catch (InvalidArgumentException $e) {
-            $this->assertTrue($e !== null);
-        }
-
-        try {
-            $jsonArray = Utils::jsonToArray(0, 1);
-        } catch (InvalidArgumentException $e) {
-            $this->assertTrue($e !== null);
-        }
+        $jsonAssoc = json_decode($this->testIssue112Json, true);
+        $jsonArray = Utils::jsonToArray($jsonAssoc);
+        $this->assertEquals($jsonAssoc, $jsonArray);
     }
 
     /**