JSON to F# Converter
Convert JSON to F# types for F# development
JSON Input
F# Output
What is JSON to F# Converter?
Need to generate F# types and records from your JSON (JavaScript Object Notation) data? This tool does that instantly. Perfect for F# developers working with .NET applications, web services, or functional programming who need to deserialize JSON into strongly-typed F# types. Generate records, types, and type definitions automatically.
According to F# documentation, records and discriminated unions are perfect for JSON serialization. Our converter analyzes your JSON structure and generates proper F# types. First, validate your JSON using our JSON Validator, then convert it to F#. You can also format your JSON with our JSON Formatter first if needed.
Everything happens in your browser – your JSON never leaves your computer. Convert, download, and use your F# types right away.
What Makes This Tool Different
Automatic Type Generation
We analyze your JSON structure and automatically generate F# types. JSON objects become F# records, arrays become F# lists or arrays, everything gets proper F# types.
Record Support
Generate F# records with proper syntax. Records are immutable by default, perfect for functional programming and JSON deserialization.
Option Types
Use Option<T> for nullable fields. Perfect for F#'s type system and safe JSON decoding with proper error handling.
File Upload Support
Got a big file? Just upload it. Works great for converting those massive JSON configs or data files without copy-pasting.
Download F#
One click to download your F# file. Drop it into your F# project and start using it. Perfect for .NET applications or functional programming.
Clean Code Output
The generated F# code is clean and well-formatted. Types are properly named, records are structured correctly, and the code follows F# conventions.
How It Works
Paste or Upload JSON
Paste your JSON into the left editor, or click "Upload" to load a file. The JSON should be valid – use our JSON Validator first if you're not sure. You can also click "Sample" to see an example.
Configure Options
Set your type name. These settings customize the generated F# code to match your project's conventions.
Download or Copy
Click "Download" to save the F# file, or "Copy" to copy it to your clipboard. The F# code is ready to use in your project. Drop it into your F# project and start using it.
When You'd Actually Use This
.NET Applications
Generate F# types from JSON API responses for .NET applications. Create models for REST APIs or JSON-based configurations. Perfect for F# web services or desktop applications.
Functional Programming
Create F# records from JSON data for functional programming projects. Generate immutable data models for JSON-based APIs or configurations. Perfect for F#'s functional paradigm.
Web Services
Generate F# types from JSON data for web services. Create data models for JSON-based APIs or configurations. Perfect for F# web frameworks.
Code Generation
Generate F# code from JSON data structures. Perfect for creating data models, DTOs, or entity types from JSON schemas or API responses.
Common Questions
Is my JSON data stored?
Nope. Everything happens right in your browser. Your JSON never leaves your computer – we don't even see it.
How are JSON objects handled?
JSON objects become F# records. Properties become record fields, and nested objects become nested records or references. Arrays become F# lists or arrays.
Can I use the generated F# code?
Yes. The generated F# code is valid and ready to use. Drop it into your F# project and start using it. You may want to review and refine the types for your specific use case.
What about JSON serialization?
The generated F# records work with System.Text.Json or Newtonsoft.Json for JSON serialization. You may need to add serialization attributes for custom property names.
Does it work with large JSON files?
Yep. Since everything happens in your browser, it depends on your device. Small to medium JSON structures convert instantly. Really huge structures might take a few seconds.
What F# version is supported?
The generated code works with F# 4.0 and later. It uses standard F# features and follows F# conventions for maximum compatibility.
Other JSON Tools You Might Need
Conversion is just one JSON task. Here are other tools that work well together:
Need to learn more about JSON? Check out the official JSON.org website or the comprehensive guide on MDN. For F#, check out the official F# documentation.