How to serialize object to json with custom fields in python

Question

I have a class

class Person(object):
    def __init__(self,age,name):
        self.person_age = age
        self.person_name = name

And i want to serialize object to json. I can do so:

person = Person(20,'Piter')
person.__dict__

But such an approach will return it:

{'person_age':20,person_name:'Piter'}

I want serialize my object to json with my own fields. Instead of 'person_age' - 'age'. Instead of 'person_name' - 'name':

{'age':20,name:'Piter'}

How can this be done if the class has many fields?

So you have a mapping of object fields to json fields? Something like {'person_name' : 'name', 'person_age':'age'}? — Dani Mesejo
– Dani Mesejo, Commented Mar 21, 2020 at 15:14

Dani Mesejo · Accepted Answer · 2020-03-21 15:21:22Z

5

IIUC, you could do the following:

import json


class Person(object):
    def __init__(self, age, name, weight):
        self.person_age = age
        self.person_name = name
        self.weight = weight


p = Person(30, 'Peter', 78)
mapping = {'person_age': 'age', 'person_name': 'name'}
result = json.dumps({mapping.get(k, k): v for k, v in p.__dict__.items()})

print(result)

Output

{"age": 30, "name": "Peter", "weight": 78}

Note that you only need those names you want to change, in the example above weight remains unchanged.

answered Mar 21, 2020 at 15:21

Dani Mesejo

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Comments

sattva_venu · Accepted Answer · 2020-03-21 15:35:18Z

-2

You can use json module to serialize the object to json format.

Here is the example:-

import json
class Person(object):
    def __init__(self,age,name):
        self.person_age = age
        self.person_name = name

person = Person(20,'Piter')

person_JSON = json.dumps(person.__dict__)
print(person_JSON)

Output:-

'{"person_age": 20, "person_name": "Piter"}'

edited Mar 21, 2020 at 15:35

answered Mar 21, 2020 at 15:28

sattva_venu

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3 Comments

Daan Over a year ago

He specifically asked to have custom field names when serializing.

sattva_venu Over a year ago

@Daan, nin hendran I have written the code with respect to the question asked. Let me know what exactly is the issue you saw with my code.

Tiago César Oliveira Over a year ago

Second part - "I want serialize my object to json with my own fields. Instead of 'person_age' - 'age'. Instead of 'person_name' - 'name':"

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