diff --git a/ibis-server/app/util.py b/ibis-server/app/util.py
index b80616857..f05f61e2e 100644
--- a/ibis-server/app/util.py
+++ b/ibis-server/app/util.py
@@ -29,7 +29,9 @@ def _to_datetime_and_format(series: pd.Series) -> pd.Series:
 
 
 def _to_json_obj(df: pd.DataFrame) -> dict:
-    data = df.to_dict(orient="split", index=False)
+    data = df.map(lambda x: f"{x:.9g}" if isinstance(x, float) else x).to_dict(
+        orient="split", index=False
+    )
 
     def default(obj):
         if pd.isna(obj):
diff --git a/ibis-server/tests/routers/v2/connector/test_bigquery.py b/ibis-server/tests/routers/v2/connector/test_bigquery.py
index 81c7ccf48..054112db1 100644
--- a/ibis-server/tests/routers/v2/connector/test_bigquery.py
+++ b/ibis-server/tests/routers/v2/connector/test_bigquery.py
@@ -90,7 +90,7 @@ async def test_query(client, manifest_str):
         1,
         370,
         "O",
-        172799.49,
+        "172799.49",
         "1996-01-02",
         "1_370",
         "2024-01-01 23:59:59.000000",
diff --git a/ibis-server/tests/routers/v2/connector/test_canner.py b/ibis-server/tests/routers/v2/connector/test_canner.py
index a1754d5b3..9eb368382 100644
--- a/ibis-server/tests/routers/v2/connector/test_canner.py
+++ b/ibis-server/tests/routers/v2/connector/test_canner.py
@@ -94,7 +94,7 @@ async def test_query(client, manifest_str):
         1,
         370,
         "O",
-        172799.49,
+        "172799.49",
         "1996-01-02",
         "1_370",
         "2024-01-01 23:59:59.000000",
diff --git a/ibis-server/tests/routers/v2/connector/test_postgres.py b/ibis-server/tests/routers/v2/connector/test_postgres.py
index e64081fad..53001867f 100644
--- a/ibis-server/tests/routers/v2/connector/test_postgres.py
+++ b/ibis-server/tests/routers/v2/connector/test_postgres.py
@@ -208,6 +208,83 @@ async def test_query_with_dot_all(client, manifest_str, postgres: PostgresContai
         assert result["dtypes"] is not None
 
 
+async def test_format_floating(client, manifest_str, postgres):
+    connection_info = _to_connection_info(postgres)
+    response = await client.post(
+        url=f"{base_url}/query",
+        json={
+            "connectionInfo": connection_info,
+            "manifestStr": manifest_str,
+            "sql": """
+SELECT
+    0.0123e-5 AS case_scientific_original,
+    1.23e+4 AS case_scientific_positive,
+    -4.56e-3 AS case_scientific_negative,
+    7.89e0 AS case_scientific_zero_exponent,
+    0e0 AS case_scientific_zero,
+
+    123.456 AS case_decimal_positive,
+    -123.456 AS case_decimal_negative,
+    0.0000123 AS case_decimal_small,
+    123.0000 AS case_decimal_trailing_zeros,
+    0.0 AS case_decimal_zero,
+
+    0 AS case_integer_zero,
+    0e-9 AS case_integer_zero_scientific,
+    -1 AS case_integer_negative,
+    9999999999 AS case_integer_large,
+
+    1.7976931348623157E+308 AS case_float_max,
+    2.2250738585072014E-308 AS case_float_min,
+    -1.7976931348623157E+308 AS case_float_min_negative,
+
+    1.23e4 + 4.56 AS case_mixed_addition,
+    -1.23e-4 - 123.45 AS case_mixed_subtraction,
+    0.0123e-5 * 1000 AS case_mixed_multiplication,
+    123.45 / 1.23e2 AS case_mixed_division,
+
+    CAST('NaN' AS FLOAT) AS case_special_nan,
+    CAST('Infinity' AS FLOAT) AS case_special_infinity,
+    CAST('-Infinity' AS FLOAT) AS case_special_negative_infinity,
+    NULL AS case_special_null,
+
+    CAST(123.456 AS FLOAT) AS case_cast_float,
+    CAST(1.23e4 AS DECIMAL(10,5)) AS case_cast_decimal
+            """,
+        },
+    )
+    assert response.status_code == 200
+    result = response.json()
+
+    assert result["data"][0][0] == "1.23E-7"
+    assert result["data"][0][1] == "1.23E+4"
+    assert result["data"][0][2] == "-0.00456"
+    assert result["data"][0][3] == "7.89"
+    assert result["data"][0][4] == "0"
+    assert result["data"][0][5] == "123.456"
+    assert result["data"][0][6] == "-123.456"
+    assert result["data"][0][7] == "0.0000123"
+    assert result["data"][0][8] == "123"
+    assert result["data"][0][9] == "0"
+    assert result["data"][0][10] == 0
+    assert result["data"][0][11] == "0"
+    assert result["data"][0][12] == -1
+    assert result["data"][0][13] == 9999999999
+    assert result["data"][0][14] == "1.7976931348623157E+308"
+    assert result["data"][0][15] == "2.2250738585072014E-308"
+    assert result["data"][0][16] == "-1.7976931348623157E+308"
+    assert result["data"][0][17] == "12304.56"
+    assert result["data"][0][18] == "-123.450123"
+    assert result["data"][0][19] == "0.000123"
+    assert result["data"][0][20] == "1.0036585365853659"
+    assert result["data"][0][21] == "nan"
+    assert result["data"][0][22] == "inf"
+    assert result["data"][0][23] == "-inf"
+    assert result["data"][0][24] is None
+    assert result["data"][0][25] == "123.456001"
+    assert result["data"][0][26] == "12300.00000"
+
+
 async def test_dry_run_with_connection_url_and_password_with_bracket_should_not_raise_value_error(
     client, manifest_str, postgres: PostgresContainer
 ):
diff --git a/ibis-server/tests/routers/v2/connector/test_trino.py b/ibis-server/tests/routers/v2/connector/test_trino.py
index e33627e8a..25cfb40dd 100644
--- a/ibis-server/tests/routers/v2/connector/test_trino.py
+++ b/ibis-server/tests/routers/v2/connector/test_trino.py
@@ -111,7 +111,7 @@ async def test_query(client, manifest_str, trino: TrinoContainer):
         1,
         370,
         "O",
-        172799.49,
+        "172799.49",
         "1996-01-02",
         "1_370",
         "2024-01-01 23:59:59.000000",
diff --git a/ibis-server/tests/routers/v3/connector/postgres/test_query.py b/ibis-server/tests/routers/v3/connector/postgres/test_query.py
index d4406ff6e..a37394cbf 100644
--- a/ibis-server/tests/routers/v3/connector/postgres/test_query.py
+++ b/ibis-server/tests/routers/v3/connector/postgres/test_query.py
@@ -115,7 +115,7 @@ async def test_query(client, manifest_str, connection_info):
         "2024-01-01 23:59:59.000000 UTC",
         "2024-01-16 04:00:00.000000 UTC",  # utc-5
         "2024-07-16 03:00:00.000000 UTC",  # utc-4
-        172799.49,
+        "172799.49",
         "1_370",
         370,
         "1996-01-02",