diff --git a/pyproject.toml b/pyproject.toml
index 31e7cab..48300de 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -79,5 +79,6 @@ markers = [
     "format: tests related to f-string based statement formatting.",
     "transaction: tests related to transaction management.",
     "exceptions: tests related to exceptions in pyexasol.",
+    "json: tests related to json serialization in pyexasol.",
 ]
 
diff --git a/test/integration/json_test.py b/test/integration/json_test.py
new file mode 100644
index 0000000..61a3821
--- /dev/null
+++ b/test/integration/json_test.py
@@ -0,0 +1,139 @@
+import pytest
+import pyexasol
+import decimal
+
+from inspect import cleandoc
+
+
+@pytest.fixture
+def connection_factory(dsn, user, password, schema):
+    connections = []
+
+    def factory(json_lib):
+        con = pyexasol.connect(
+            dsn=dsn,
+            user=user,
+            password=password,
+            schema=schema,
+            json_lib=json_lib,
+        )
+        connections.append(con)
+        return con
+
+    yield factory
+
+    for c in connections:
+        c.close()
+
+
+@pytest.fixture
+def table(connection):
+    name = "edge_case"
+    ddl = cleandoc(
+        f"""CREATE OR REPLACE TABLE {name}
+        (
+            dec36_0         DECIMAL(36,0),
+            dec36_36        DECIMAL(36,36),
+            dbl             DOUBLE,
+            bl              BOOLEAN,
+            dt              DATE,
+            ts              TIMESTAMP,
+            var100          VARCHAR(100),
+            var2000000      VARCHAR(2000000)
+        )
+        """
+    )
+    connection.execute(ddl)
+    connection.commit()
+
+    yield name
+
+    delete_stmt = f"DROP TABLE IF EXISTS {name};"
+    connection.execute(delete_stmt)
+    connection.commit()
+
+
+@pytest.fixture
+def edge_cases():
+    return [
+        # Biggest values
+        {
+            "DEC36_0": decimal.Decimal("+" + ("9" * 36)),
+            "DEC36_36": decimal.Decimal("+0." + ("9" * 36)),
+            "DBL": 1.7e308,
+            "BL": True,
+            "DT": "9999-12-31",
+            "TS": "9999-12-31 23:59:59.999",
+            "VAR100": "ひ" * 100,
+            "VAR2000000": "ひ" * 2000000,
+        },
+        # Smallest values
+        {
+            "DEC36_0": decimal.Decimal("-" + ("9" * 36)),
+            "DEC36_36": decimal.Decimal("-0." + ("9" * 36)),
+            "DBL": -1.7e308,
+            "BL": False,
+            "DT": "0001-01-01",
+            "TS": "0001-01-01 00:00:00",
+            "VAR100": "",
+            "VAR2000000": "ひ",
+        },
+        # All nulls
+        {
+            "DEC36_0": None,
+            "DEC36_36": None,
+            "DBL": None,
+            "BL": None,
+            "DT": None,
+            "TS": None,
+            "VAR100": None,
+            "VAR2000000": None,
+        },
+    ]
+
+
+@pytest.mark.json
+@pytest.mark.parametrize("json_lib", ["orjson", "ujson", "rapidjson"])
+def test_insert(table, connection_factory, edge_cases, json_lib):
+    connection = connection_factory(json_lib)
+    insert_stmt = (
+        "INSERT INTO edge_case VALUES"
+        "({DEC36_0!d}, {DEC36_36!d}, {DBL!f}, {BL}, {DT}, {TS}, {VAR100}, {VAR2000000})"
+    )
+    for edge_case in edge_cases:
+        connection.execute(insert_stmt, edge_case)
+
+    expected = len(edge_cases)
+    actual = connection.execute(f"SELECT COUNT(*) FROM {table};").fetchval()
+
+    assert actual == expected
+
+
+@pytest.mark.json
+@pytest.mark.parametrize("json_lib", ["orjson", "ujson", "rapidjson"])
+def test_select(table, connection_factory, edge_cases, json_lib):
+    connection = connection_factory(json_lib)
+
+    insert_stmt = (
+        "INSERT INTO edge_case VALUES"
+        "({DEC36_0!d}, {DEC36_36!d}, {DBL!f}, {BL}, {DT}, {TS}, {VAR100}, {VAR2000000})"
+    )
+    for edge_case in edge_cases:
+        connection.execute(insert_stmt, edge_case)
+
+    select_stmt = (
+        "SELECT DEC36_0, DEC36_36, DBL, BL, DT, TS, VAR100, LENGTH(VAR2000000) "
+        "AS LEN_VAR FROM EDGE_CASE"
+    )
+
+    expected = {
+        # Biggest values
+        ("9" * 36, f"0.{'9' * 36}", 1.7e308, True, "9999-12-31", "9999-12-31 23:59:59.999000", "ひ" * 100, 2000000),
+        # Smallest values
+        (f"-{'9' * 36}", f"-0.{'9' * 36}", -1.7e308, False, "0001-01-01", "0001-01-01 00:00:00.000000", None, 1),
+        # All nulls
+        (None, None, None, None, None, None, None, None),
+    }
+    actual = set(connection.execute(select_stmt).fetchall())
+
+    assert actual == expected