How can you specify the order of fields in JSON data serialization?

During the JSON data serialization process, the order of fields cannot be determined. This is because JSON is a data structure of unordered key-value pairs. Different JSON serialization libraries or tools may output fields in different orders.

If you need to specify the order of fields, you can manually adjust the order of fields by converting the JSON data to a string, and then parse it back to JSON format. Here is an example code:

import json

data = {
    "field3": "value3",
    "field1": "value1",
    "field2": "value2"
}

# 将JSON数据转换为字符串
json_str = json.dumps(data, indent=4)

# 将字符串按照指定的字段顺序调整
ordered_json_str = json.dumps(json.loads(json_str), indent=4, sort_keys=True)

print(ordered_json_str)

When running the code above, the fields in the output JSON string will be sorted alphabetically.

{
    "field1": "value1",
    "field2": "value2",
    "field3": "value3"
}

Please note that this method is only suitable for simple cases. If your JSON data structure is complex or nested, you may need to consider alternative solutions.