diff --git a/src/EncryptedRow.php b/src/EncryptedRow.php
index 4301dd7..8b087ab 100644
--- a/src/EncryptedRow.php
+++ b/src/EncryptedRow.php
@@ -14,6 +14,7 @@
 };
 use ParagonIE\ConstantTime\Hex;
 use SodiumException;
+use TypeError;
 
 /**
  * Class EncryptedRow
@@ -232,6 +233,34 @@ public function createCompoundIndex(
         return $index;
     }
 
+    /**
+     * Create a fast compound blind index then add it to this EncryptedRow object.
+     *
+     * @param string $name
+     * @param array<int, string> $columns
+     * @param int $filterBits
+     * @param array $hashConfig
+     * @return CompoundIndex
+     *
+     * @throws CipherSweetException
+     */
+    public function createFastCompoundIndex(
+        string $name,
+        array $columns = [],
+        int $filterBits = 256,
+        array $hashConfig = []
+    ): CompoundIndex {
+        $index = new FastCompoundIndex(
+            $name,
+            $columns,
+            $filterBits,
+            true,
+            $hashConfig
+        );
+        $this->addCompoundIndex($index);
+        return $index;
+    }
+
     /**
      * Calculate a blind index (or compound blind index) output for this row.
      *
@@ -422,10 +451,10 @@ public function decryptRow(
             }
             if (
                 !empty($this->aadSourceField[$field])
-                    &&
+                &&
                 \array_key_exists($this->aadSourceField[$field], $row)
             ) {
-                $aad = (string) $row[$this->aadSourceField[$field]];
+                $aad = $this->coaxAadToString($row[$this->aadSourceField[$field]]);
             } else {
                 $aad = '';
             }
@@ -453,7 +482,7 @@ public function decryptRow(
      * If any columns are defined in this object to be encrypted, the value
      * will be encrypted in-place in the returned array.
      *
-     * @param array<string, string|int|float|bool|null> $row
+     * @param array<string, scalar|scalar[]|null> $row
      * @return array<string, string>
      *
      * @throws ArrayKeyException
@@ -463,7 +492,8 @@ public function decryptRow(
      */
     public function encryptRow(
         #[\SensitiveParameter]
-        array $row
+        array $row,
+        bool $decode_json = false,
     ): array {
         /** @var array<string, string|int|float|bool|null|scalar[]> $return */
         $return = $row;
@@ -472,7 +502,7 @@ public function encryptRow(
             if (!\array_key_exists($field, $row)) {
                 throw new ArrayKeyException(
                     'Expected value for column ' .
-                        $field .
+                    $field .
                     ' on array, nothing given.'
                 );
             }
@@ -482,14 +512,19 @@ public function encryptRow(
             );
             if (
                 !empty($this->aadSourceField[$field])
-                    &&
+                &&
                 \array_key_exists($this->aadSourceField[$field], $row)
             ) {
-                $aad = (string) $row[$this->aadSourceField[$field]];
+                $aad = $this->coaxAadToString($row[$this->aadSourceField[$field]]);
             } else {
                 $aad = '';
             }
             if ($type === Constants::TYPE_JSON && !empty($this->jsonMaps[$field])) {
+                $return[$field] = $row[$field];
+                // checks decode json option
+                if ($decode_json) {
+                    $row[$field] = $this->formatJson($row[$field]);
+                }
                 // JSON is a special case
                 $jsonEncryptor = new EncryptedJsonField(
                     $backend,
@@ -497,10 +532,12 @@ public function encryptRow(
                     $this->jsonMaps[$field],
                     $this->jsonStrict[$field]
                 );
-                /** @psalm-suppress InvalidArgument */
-                $return[$field] = $jsonEncryptor->encryptJson($row[$field], $aad);
+                $return[$field] = $jsonEncryptor->encryptJson($this->coaxToArray($row[$field]), $aad);
                 continue;
             }
+            if (!is_scalar($row[$field])) {
+                throw new TypeError('Invalid type for ' . $field);
+            }
             $plaintext = $this->convertToString($row[$field], $type);
             $return[$field] = $backend->encrypt($plaintext, $key, $aad);
         }
@@ -511,6 +548,20 @@ public function encryptRow(
         return $return;
     }
 
+    /**
+     * Decoding json field
+     *
+     * @param array<array-key, mixed>|mixed|null $field
+     * @return array<array-key, mixed>
+     */
+    public function formatJson(
+        $field
+    ): array {
+        //decode json field then to take key from it to encrypt it
+        $field = isset($field) ? (is_string($field) ? (array)json_decode($field) : $field) : [];
+        return $field;
+    }
+
     /**
      * Process an entire row, which means:
      *
@@ -848,4 +899,42 @@ public function setTypedIndexes(bool $bool): static
         $this->typedIndexes = $bool;
         return $this;
     }
+
+    /**
+     * @param mixed $input
+     * @return array
+     */
+    protected function coaxToArray(mixed $input): array
+    {
+        if (is_array($input)) {
+            return $input;
+        }
+        if (is_null($input)) {
+            return [];
+        }
+        if (is_object($input)) {
+            /** psalm-suppress PossiblyInvalidCast */
+            return (array) $input;
+        }
+        if (is_string($input)) {
+            return json_decode($input, true);
+        }
+        throw new TypeError("Cannot coax to array: " . gettype($input));
+    }
+
+    /**
+     * @param mixed $input
+     * @return string
+     */
+    protected function coaxAadToString(mixed $input): string
+    {
+        if (is_string($input)) {
+            return $input;
+        }
+        if (is_numeric($input)) {
+            return '' . $input;
+        }
+        /** psalm-suppress PossiblyInvalidCast */
+        return (string) $input;
+    }
 }
diff --git a/src/FastCompoundIndex.php b/src/FastCompoundIndex.php
new file mode 100644
index 0000000..5210a05
--- /dev/null
+++ b/src/FastCompoundIndex.php
@@ -0,0 +1,38 @@
+<?php
+declare(strict_types=1);
+namespace ParagonIE\CipherSweet;
+
+use ParagonIE\CipherSweet\Exception\CipherSweetException;
+
+class FastCompoundIndex extends CompoundIndex
+{
+    /**
+     * FastCompoundIndex constructor.
+     *
+     * @param string $name
+     * @param array<int, string> $columns
+     * @param int $filterBits
+     * @param bool $fastHash
+     * @param array $hashConfig
+     *
+     * @throws CipherSweetException
+     */
+    public function __construct(
+        string $name,
+        array $columns = [],
+        int $filterBits = 256,
+        bool $fastHash = true,
+        array $hashConfig = []
+    ) {
+        if (!$fastHash) {
+            throw new CipherSweetException("FastCompoundIndex cannot be turned slow");
+        }
+        return parent::__construct(
+            $name,
+            $columns,
+            $filterBits,
+            $fastHash,
+            $hashConfig
+        );
+    }
+}