diff --git a/src/ClientContextInterface.php b/src/ClientContextInterface.php
index a2b54ad5..b24cf198 100644
--- a/src/ClientContextInterface.php
+++ b/src/ClientContextInterface.php
@@ -102,9 +102,10 @@ use Predis\Command\CommandInterface;
  * @method $this jsondel(string $key, string $path = '$')
  * @method $this jsonget(string $key, string $indent = '', string $newline = '', string $space = '', string ...$paths)
  * @method $this jsonmget(array $keys, string $path)
- * @method $this jsonset(string $key, string $path, string $value, ?string $subcommand = null)
  * @method $this jsonobjkeys(string $key, string $path = '$')
  * @method $this jsonobjlen(string $key, string $path = '$')
+ * @method $this jsonset(string $key, string $path, string $value, ?string $subcommand = null)
+ * @method $this jsonstrappend(string $key, string $path, string $value)
  * @method $this blmove(string $source, string $destination, string $where, string $to, int $timeout)
  * @method $this blpop(array|string $keys, $timeout)
  * @method $this brpop(array|string $keys, $timeout)
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index 1dcae748..13c5d1ef 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -111,9 +111,10 @@ use Predis\Response\Status;
  * @method int               jsondel(string $key, string $path = '$')
  * @method string            jsonget(string $key, string $indent = '', string $newline = '', string $space = '', string ...$paths)
  * @method array             jsonmget(array $keys, string $path)
- * @method string            jsonset(string $key, string $path, string $value, ?string $subcommand = null)
  * @method array             jsonobjkeys(string $key, string $path = '$')
  * @method array             jsonobjlen(string $key, string $path = '$')
+ * @method string            jsonset(string $key, string $path, string $value, ?string $subcommand = null)
+ * @method array             jsonstrappend(string $key, string $path, string $value)
  * @method string            blmove(string $source, string $destination, string $where, string $to, int $timeout)
  * @method array|null        blpop(array|string $keys, int|float $timeout)
  * @method array|null        brpop(array|string $keys, int|float $timeout)
diff --git a/src/Command/Redis/Json/JSONSTRAPPEND.php b/src/Command/Redis/Json/JSONSTRAPPEND.php
new file mode 100644
index 00000000..9b11458e
--- /dev/null
+++ b/src/Command/Redis/Json/JSONSTRAPPEND.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\Json;
+
+use Predis\Command\Command as RedisCommand;
+
+/**
+ * @see https://redis.io/commands/json.strappend/
+ *
+ * Append the json-string values to the string at path
+ */
+class JSONSTRAPPEND extends RedisCommand
+{
+    public function getId()
+    {
+        return 'JSON.STRAPPEND';
+    }
+}
diff --git a/tests/Predis/Command/Redis/Json/JSONSTRAPPEND_Test.php b/tests/Predis/Command/Redis/Json/JSONSTRAPPEND_Test.php
new file mode 100644
index 00000000..7ca9a0a8
--- /dev/null
+++ b/tests/Predis/Command/Redis/Json/JSONSTRAPPEND_Test.php
@@ -0,0 +1,123 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) 2009-2020 Daniele Alessandri
+ * (c) 2021-2023 Till Krüss
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Command\Redis\Json;
+
+use Predis\Command\Redis\PredisCommandTestCase;
+
+class JSONSTRAPPEND_Test extends PredisCommandTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedCommand(): string
+    {
+        return JSONSTRAPPEND::class;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getExpectedId(): string
+    {
+        return 'JSONSTRAPPEND';
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testFilterArguments(): void
+    {
+        $arguments = ['key', '$..', 'value'];
+        $expected = ['key', '$..', 'value'];
+
+        $command = $this->getCommand();
+        $command->setArguments($arguments);
+
+        $this->assertSame($expected, $command->getArguments());
+    }
+
+    /**
+     * @group disconnected
+     */
+    public function testParseResponse(): void
+    {
+        $this->assertSame(1, $this->getCommand()->parseResponse(1));
+    }
+
+    /**
+     * @group connected
+     * @dataProvider jsonProvider
+     * @param  array  $jsonArguments
+     * @param  string $key
+     * @param  string $path
+     * @param  string $value
+     * @param  array  $expectedStringLength
+     * @param  string $expectedModifiedJson
+     * @return void
+     * @requiresRedisJsonVersion >= 1.0.0
+     */
+    public function testAppendStringToExistingJsonString(
+        array $jsonArguments,
+        string $key,
+        string $path,
+        string $value,
+        array $expectedStringLength,
+        string $expectedModifiedJson
+    ): void {
+        $redis = $this->getClient();
+
+        $redis->jsonset(...$jsonArguments);
+        $actualResponse = $redis->jsonstrappend($key, $path, $value);
+
+        $this->assertSame($expectedStringLength, $actualResponse);
+        $this->assertSame($expectedModifiedJson, $redis->jsonget($key));
+    }
+
+    public function jsonProvider(): array
+    {
+        return [
+            'appends to json string on root level' => [
+                ['key', '$', '{"key1":"value1","key2":"value2"}'],
+                'key',
+                '$.key2',
+                '"foo"',
+                [9],
+                '{"key1":"value1","key2":"value2foo"}',
+            ],
+            'appends to json string on nested level' => [
+                ['key', '$', '{"key1":{"key2":"value2"}}'],
+                'key',
+                '$..key2',
+                '"foo"',
+                [9],
+                '{"key1":{"key2":"value2foo"}}',
+            ],
+            'appends to json string on both levels' => [
+                ['key', '$', '{"key1":{"key2":"value2"},"key2":"value2"}'],
+                'key',
+                '$..key2',
+                '"foo"',
+                [9, 9],
+                '{"key1":{"key2":"value2foo"},"key2":"value2foo"}',
+            ],
+            'appends to non-json string' => [
+                ['key', '$', '{"key1":{"key2":[1,2,3]}}'],
+                'key',
+                '$..key2',
+                '"foo"',
+                [null],
+                '{"key1":{"key2":[1,2,3]}}',
+            ],
+        ];
+    }
+}