Home AIBeta Tools Datasets API Skills Download Pricing Requests

We use cookies.This website uses essential cookies to operate core features. With your consent, we also use analytics cookies to understand traffic and improve the service. For more details, see our .

Toolkk

Home AIBeta Tools Datasets API Skills Download Pricing Requests

Home

Development

JSON to Swift Converter

JSON to Swift Object | Codable Struct Generator | Toolkk

Home

Development

JSON to Swift Converter

Was this tool helpful to use?

Your feedback helps us make it better

TypeScript JavaScript Python Java Go C#Rust Kotlin Swift Dart

TypeScriptJavaScriptPythonJavaGoC#RustKotlinSwiftDartPHPRubyC++Objective-CElmHaskellJSON SchemacJSONElixirCrystalFlowJavaScript PropTypesPikeScala 3SmithyTypeScript Effect SchemaTypeScript ZodMore

JSON Input

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

Swift Options

Type Name

Struct or Class

Swift Output

JSON Input

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

Swift Options

Type Name

Struct or Class

Just Type Definitions

Code Density

Swift Output

JSON to Swift Converter

Instantly parse standard JSON data into Codable-compliant Swift structs or classes for iOS and macOS development.

TypeScript JavaScript Python Java Go C#Rust Kotlin Swift Dart

TypeScriptJavaScriptPythonJavaGoC#RustKotlinSwiftDartPHPRubyC++Objective-CElmHaskellJSON SchemacJSONElixirCrystalFlowJavaScript PropTypesPikeScala 3SmithyTypeScript Effect SchemaTypeScript ZodMore

JSON Input

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

Swift Options

Type Name

Struct or Class

Swift Output

JSON Input

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

{
  "name": "John Doe",
  "age": 30,
  "isActive": true,
  "email": "john.doe@example.com",
  "tags": ["developer", "typescript"],
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "zipCode": "10001"
  },
  "projects": [
    {
      "id": 1,
      "title": "Project Alpha",
      "status": "completed"
    }
  ]
}

Swift Options

Type Name

Struct or Class

Just Type Definitions

Code Density

Swift Output

Overview

Features and technical background

Understand what the tool solves, how it works, and the boundaries of its data.

Tags: Swift JSON Codable Code Generator

Turn a JSON sample into Swift model code

Paste a valid JSON object or array to generate Swift type definitions based on the values present in that sample. You can name the root type, choose a struct or class, and adjust generation options. Nested objects become related model types, while arrays are inferred from their example elements. This is a starting model inferred from sample data, not a schema validator or a guarantee about every response an API may return.

The “type definitions only” option is enabled by default. In that mode, the output focuses on the model types and does not add Codable conformance or JSON key mappings. Turn that option off when you want the fuller generated form, then inspect the generated CodingKeys, initializer, and helper code before using it. In Swift, Codable combines encoding and decoding protocols, and custom coding keys can map JSON names to Swift property names.

Inference depends on the sample. A field that appears once may still be absent or null in other responses; empty arrays provide no element example; and fields with different shapes need deliberate modeling. Date-like strings or number-like strings may also need a different type from the one inferred.

RFC 8259 defines JSON syntax and interchange requirements; published December 2017, checked 2026-09-28.
Apple’s Encoding and Decoding Custom Types explains Codable and CodingKeys; checked 2026-09-28.

Guide

How to use this tool

Follow the workflow and verify inputs and outputs with practical examples.

Generate code you can verify in a Swift project

Paste valid JSON
Use a JSON object or array with double-quoted strings and no comments or trailing commas. If parsing fails, correct the input before reviewing code.
Name the root type
Replace Root with a domain name such as AccountResponse so the generated model is easier to use and maintain.
Choose the output mode
Keep “type definitions only” for a compact model skeleton. Turn it off for generated Codable-related code, and review the mapping and helper options.
Inspect inferred types
Check optionality, dates, UUIDs, enums, numeric values, and nested arrays against the API contract. Do not treat the sample as proof that all future values have the same shape.
Copy or download and test
Bring the Swift source into your project and decode representative real responses, including missing fields, nulls, empty arrays, and alternate values.

Use cases

Where this tool helps

See how the tool fits into real work and everyday tasks.

Use a generated model as a practical first pass

Start an iOS API model

Paste a representative response to draft nested Swift types, then compare each property with the endpoint documentation before integrating decoding.

Review a response change

Generate types from an updated sample and inspect new or reshaped fields as a prompt for an API compatibility review.

Learn JSON-to-Swift mappings

Try a small sample with strings, numbers, arrays, booleans, and nested objects to see how the selected options affect the resulting declarations.

Q&A

Frequently asked questions

Find concise answers to common questions and confusing cases.

Common Swift generation questions

Does the default output conform to Codable?

No. “Type definitions only” starts enabled, so the default is model declarations without Codable conformance. Turn it off for fuller generated Codable-related code.

Why is a property not optional?

A single sample only shows that the field appeared once. If the API can omit it or return null, update the model and test against those responses.

Will a snake_case JSON key decode into camelCase automatically?

Check the selected output mode and generated mapping. Type-only output does not include a CodingKeys mapping; fuller output can generate coding keys, which should be reviewed against the original JSON keys.

Why did a date-looking value become a Date?

Date inference is enabled by default. If the API treats that value as text or uses inconsistent date formats, turn off the inference or adjust the model and decoder strategy.

Notes

Important notes and limitations

Review scope, result limitations, and important precautions before use.

Review code against the real API contract

Generated code is a draft based on the JSON sample you provide. It does not validate an API schema or establish that production data will always match the sample.

JSON must follow the interchange syntax; JavaScript comments, single-quoted strings, undefined values, and trailing commas are not valid JSON input.
Empty arrays, mixed-type arrays, nullable values, and inconsistent object shapes can make inference incomplete or too broad.
Check integer ranges, decimal precision, date formats, property naming, access levels, and custom decoding needs before shipping.
Do not paste confidential API payloads unless you are permitted to process them in this online tool.

Explore related resources

Discover related tools, collections, and available API capabilities.

API service

APIAPI Service Coming SoonAPI access is not yet available. Submit a request and tell us how you plan to integrate it.

JSON InputFormatSample

Swift OptionsShow Advanced

Swift OutputDownload

JSON Input

Swift OptionsMore

Swift Output

JSON InputFormatSample

Swift OptionsShow Advanced

Swift OutputDownload

JSON Input

Swift OptionsMore

Swift Output

Turn a JSON sample into Swift model code

Generate code you can verify in a Swift project

Paste valid JSON

Name the root type

Choose the output mode

Inspect inferred types

Copy or download and test

Use a generated model as a practical first pass

Start an iOS API model

Review a response change

Learn JSON-to-Swift mappings

Common Swift generation questions

Review code against the real API contract

Related tools

API service

JSON Input

Swift Options

Swift Output

Swift Options

JSON Input

Swift Options

Swift Output

Swift Options