diff --git a/config/asseco-custom-fields.php b/config/asseco-custom-fields.php
index 36da062..1f77fd5 100644
--- a/config/asseco-custom-fields.php
+++ b/config/asseco-custom-fields.php
@@ -16,6 +16,7 @@
 use Asseco\CustomFields\App\PlainTypes\DateType;
 use Asseco\CustomFields\App\PlainTypes\FloatType;
 use Asseco\CustomFields\App\PlainTypes\IntegerType;
+use Asseco\CustomFields\App\PlainTypes\JsonType;
 use Asseco\CustomFields\App\PlainTypes\StringType;
 use Asseco\CustomFields\App\PlainTypes\TextType;
 use Asseco\CustomFields\App\PlainTypes\TimeType;
@@ -48,6 +49,7 @@
         'string' => StringType::class,
         'text' => TextType::class,
         'time' => TimeType::class,
+        'json' => JsonType::class,
     ],
 
     'migrations' => [
diff --git a/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php b/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php
new file mode 100644
index 0000000..f7ddfbf
--- /dev/null
+++ b/migrations/2024_11_12_073145_add_json_type_to_custom_field_plain_types_table.php
@@ -0,0 +1,56 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Str;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $exists = DB::table('custom_field_plain_types')->where('name', 'json')->exists();
+        if ($exists) {
+            // already exists
+            return;
+        }
+
+        $types = ['json'];
+
+        $plainTypes = [];
+        foreach ($types as $type) {
+            if (config('asseco-custom-fields.migrations.uuid')) {
+                $plainTypes[] = [
+                    'id' => Str::uuid(),
+                    'name' => $type,
+                    'created_at' => now(),
+                    'updated_at' => now(),
+                ];
+            } else {
+                $plainTypes[] = [
+                    'name' => $type,
+                    'created_at' => now(),
+                    'updated_at' => now(),
+                ];
+            }
+        }
+
+        DB::table('custom_field_plain_types')->insert($plainTypes);
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        DB::table('custom_field_plain_types')
+            ->where('name', 'json')
+            ->delete();
+    }
+};
diff --git a/migrations/2024_11_12_073245_add_json_to_custom_field_values_table.php b/migrations/2024_11_12_073245_add_json_to_custom_field_values_table.php
new file mode 100644
index 0000000..a325d1a
--- /dev/null
+++ b/migrations/2024_11_12_073245_add_json_to_custom_field_values_table.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('custom_field_values', function (Blueprint $table) {
+            $table->json('json')->nullable()->default(null)->after('time');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('custom_field_values', function (Blueprint $table) {
+            $table->dropColumn('json');
+        });
+    }
+};
diff --git a/src/App/Contracts/PlainTypes/JsonType.php b/src/App/Contracts/PlainTypes/JsonType.php
new file mode 100644
index 0000000..6ec4cea
--- /dev/null
+++ b/src/App/Contracts/PlainTypes/JsonType.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace Asseco\CustomFields\App\Contracts\PlainTypes;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @mixin Model|\Asseco\CustomFields\App\PlainTypes\TimeType
+ */
+interface JsonType
+{
+}
diff --git a/src/App/Http/Requests/ValueRequest.php b/src/App/Http/Requests/ValueRequest.php
index d3ae7bd..fa4787b 100644
--- a/src/App/Http/Requests/ValueRequest.php
+++ b/src/App/Http/Requests/ValueRequest.php
@@ -38,6 +38,7 @@ public function rules()
             'datetime' => 'nullable|string',
             'date' => 'nullable|string',
             'time' => 'nullable|string',
+            'json' => 'nullable|array',
         ];
     }
 
diff --git a/src/App/Models/Value.php b/src/App/Models/Value.php
index 92c23ae..62f4f6f 100644
--- a/src/App/Models/Value.php
+++ b/src/App/Models/Value.php
@@ -23,7 +23,7 @@ class Value extends Model implements \Asseco\CustomFields\App\Contracts\Value
      * Columns which are classified as value columns.
      */
     public const VALUE_COLUMNS = [
-        'string', 'integer', 'float', 'text', 'boolean', 'datetime', 'date', 'time',
+        'string', 'integer', 'float', 'text', 'boolean', 'datetime', 'date', 'time', 'json',
     ];
 
     /**
@@ -36,6 +36,11 @@ class Value extends Model implements \Asseco\CustomFields\App\Contracts\Value
     protected $guarded = ['id', 'created_at', 'updated_at'];
 
     protected $appends = ['value'];
+    protected $casts = [
+        'float' => 'float',
+        'boolean' => 'boolean',
+        'json' => 'array',
+    ];
 
     protected static function booted()
     {
diff --git a/src/App/PlainTypes/JsonType.php b/src/App/PlainTypes/JsonType.php
new file mode 100644
index 0000000..cd7a244
--- /dev/null
+++ b/src/App/PlainTypes/JsonType.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Asseco\CustomFields\App\PlainTypes;
+
+use Asseco\CustomFields\App\Contracts\Mappable;
+use Asseco\CustomFields\App\Models\PlainType;
+use Illuminate\Database\Eloquent\Builder;
+
+class JsonType extends PlainType implements Mappable, \Asseco\CustomFields\App\Contracts\PlainTypes\JsonType
+{
+    protected static function booted()
+    {
+        static::addGlobalScope('name', function (Builder $builder) {
+            $builder->where('name', 'json');
+        });
+    }
+
+    public static function mapToValueColumn(): string
+    {
+        return 'json';
+    }
+}