NEW: Got a question? Get help on our new forums! >>

How to sort the keys of your JSON using Codable

Swift version: 5.1

Paul Hudson    @twostraws   

When you use JSONEncoder and Codable to create JSON from your Swift data, your properties get written out in the order they appear inside your class. This is nearly always fine, because relying on key ordering in your JSON is almost certainly a bad idea.

However, if you’re debugging a large type and it’s hard to dig through keys to find what you want, JSONEncoder has the perfect option for you: you can sort your JSON keys alphabetically.

To make it happen, change the outputFormatting property of your JSONEncoder object to be .sortedKeys, like this:

let encoder = JSONEncoder()
encoder.outputFormatting = .sortedKeys

Now any JSON you produce will use alphabetical order for your keys rather than using their natural order inside your type.

Hacking with Swift is sponsored by Instabug

SPONSORED Catch bugs as soon as they happen and know exactly why a crash occurred by integrating Instabug's SDK in one minute. You will automatically receive device data, network logs, and reproduction steps with every bug and crash report.

Learn more and get started for free

Sponsor Hacking with Swift and reach the world's largest Swift community!

Support my work on Patreon

Available from iOS 8.0

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 2.3/5