Developer & Data ToolsJSON Tools

JSON to Model Generator

Convert JSON into typed models for Java, Swift, Objective-C, Kotlin, TypeScript, PHP, C#, Go, Dart, and Python. Paste sample JSON, choose a language, root model name, and naming style, then generate code locally in your browser. Your JSON is processed in your browser and is not uploaded.

Browser-localFreeNo upload required

Tool workspace

Your JSON is processed in your browser and is not uploaded.

Paste a JSON object or array. Empty input and invalid JSON show visible feedback here.

RootModel.tsWaiting for JSON input

Model summary

Models
0
Root
RootModel
Language
TypeScript
Optional fields
0

Warnings

  • Warnings about empty arrays, mixed values, and renamed fields appear here.

Supported languages

Java, Swift, Objective-C, Kotlin, TypeScript, PHP, C#, Go, Dart, and Python.

Common JSON to model use cases

Turn API responses, mobile app payloads, mock data, and nested JSON examples into typed model scaffolds that you can review before using in a project.

Raw schema preview
What this tool is for
Use this JSON to Model Generator to turn sample JSON into typed model code for Java, Swift, Objective-C, Kotlin, TypeScript, PHP, C#, Go, Dart, and Python.
How to use
  1. Paste a JSONobject or supported JSONarray into the input panel.
  2. Choose a target language, naming style, null handling, and root model name.
  3. Generate the model code, review warnings and the schema summary, then copy the code when it fits your project.
Example
Example: Paste a user profile JSON with nested profile data and tags, then generate TypeScript interfaces, Kotlin data classes, Swift Codable structs, or Java model classes from the same sample.
FAQ
Does this tool upload my JSON?
No. JSON parsing and model generation run locally in your browser.
Which languages are supported in v1?
Java, Swift, Objective-C, Kotlin, TypeScript, PHP, C#, Go, Dart, and Python.
Can I use the generated code without review?
No. It is based on sample JSON structure and should be reviewed before use in an app or service.
Can it handle arrays and nested objects?
Yes. It supports object roots, array roots, nested objects, objectarrays, null values, and field naming conversion.
What input or result is JSON to Model Generator designed around?
Use JSON to Model Generator when a small JSON formatting, validation, or conversion task needs a clear input, a checked result, and output you can copy without opening a larger app. A practical first step is: Paste or enter a nested JSON response or object. Example context: A useful check is to try a nested JSON response or object and compare the final output with readable, validated, or converted JSON output.
What should I check before using JSON to Model Generator?
Confirm that the input format matches the example on the page, review the result for your context, and avoid using the output as professional advice when the task has legal, financial, medical, security, or compliance impact.
How is JSON to Model Generator different from the broader Developer & Data Tools category?
Developer & Data Tools groups many related helpers, while JSON to Model Generator focuses on one json tools task so the input, output, limits, and related next steps stay clear.
When to use JSON to Model Generator
Use JSON to Model Generator when a small JSON formatting, validation, or conversion task needs a clear input, a checked result, and output you can copy without opening a larger app.
JSON to Model Generator is useful when you need a focused json tools helper inside the broader Developer & Data Tools workflow. Common context includes format structured data, convert between data formats, inspect encoded values.
Typical keywords and task signals for this page include JSON Tools, json, model generator, class generator. Use it when the result needs to be copied into a document, spreadsheet, code editor, website, campaign, classroom activity, or another browser tab.
Example workflow
  1. Paste or enter a nested JSON response or object.
  2. Compare the generated output with readable, validated, or converted JSON output.
  3. Adjust the input if needed, then copy the final result.
  4. Compare the output with the example: A useful check is to try a nested JSON response or object and compare the final output with readable, validated, or converted JSON output.
Limits and checks
Use JSON to Model Generator when a small JSON formatting, validation, or conversion task needs a clear input, a checked result, and output you can copy without opening a larger app. Use it for quick operational work, then verify high-impact decisions with an authoritative source.
For important work, keep the original input available, check edge cases manually, and verify the result against an authoritative source before publishing or sharing it.
Privacy boundary
Your JSON is processed in your browser and is not uploaded, stored, or sent to an external API by this tool.
Do not paste passwords, private keys, account secrets, payment data, or confidential business records into any online tool unless you have reviewed the page behavior and your own data policy.
Continue the workflow
Open the category page for a wider view, or use a related tool when the next step is validation, cleanup, conversion, preview, or calculation.
Search tools
Find another tool
Search the ZZP Box directory by tool name, category, or task.