Sparse fieldsets (select fields) in Rest API

Introduction

Sparse fieldsets let you ask an API to send only the data you want. This saves time and data by not sending extra information.

When you want to load only a few details about a user instead of all their data.

When your app needs just the title and author of books, not the full book details.

When you want to speed up your app by reducing the amount of data from the server.

When you want to reduce data costs on slow or limited internet connections.

Syntax

Rest API

GET /articles?fields[articles]=title,body,author

# fields[resource]=field1,field2,...

You specify fields for each resource type separately.

Use commas to list the fields you want.

Examples

Get only the name and email fields for users.

Rest API

GET /users?fields[users]=name,email

Get only the title and summary fields for articles.

Rest API

GET /articles?fields[articles]=title,summary

Get only the body field for comments.

Rest API

GET /comments?fields[comments]=body

Sample Program

This program asks the API to send only the title and author fields of articles. It then prints the response.

Rest API

import requests

# URL of the API endpoint
url = 'https://api.example.com/articles'

# Parameters to request only title and author fields
params = {'fields[articles]': 'title,author'}

# Make the GET request
response = requests.get(url, params=params)

# Print the JSON response
print(response.json())

Important Notes

Not all APIs support sparse fieldsets; check the API documentation.

If you request fields that don't exist, the API may ignore them or return an error.

Sparse fieldsets help reduce bandwidth and improve app speed.

Summary

Sparse fieldsets let you select only the fields you want from an API.

Use the fields[resource]=field1,field2 query parameter format.

This makes your app faster and uses less data.