How do I stream decode large payloads using JSON with Swift?

In this guide, we'll learn how to stream decode large JSON payloads in Swift using the built-in JSONDecoder. When dealing with large data, it's essential to ensure that your application remains responsive while processing the information.

Swift's JSONDecoder offers mechanisms to decode data incrementally, reducing memory usage and improving performance. Below is an example that shows how to achieve this:

import Foundation struct MyData: Codable { let id: Int let name: String } func streamDecodeLargeJSON() { guard let url = URL(string: "https://example.com/large.json") else { return } let task = URLSession.shared.dataTask(with: url) { data, response, error in guard let data = data, error == nil else { print("Error fetching data: \(String(describing: error))") return } do { let decoder = JSONDecoder() // Create a stream reader let jsonStream = InputStream(data: data) jsonStream.open() // Decode the JSON in a streamed fashion while jsonStream.hasBytesAvailable { let chunkSize = 1024 // This can be adjusted based on your needs var buffer = [UInt8](repeating: 0, count: chunkSize) let bytesRead = jsonStream.read(&buffer, maxLength: chunkSize) if bytesRead > 0 { let jsonFragment = Data(buffer[0..

Swift JSON Data Decoding Streaming Performance Large Payloads

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