JSON to C# Converter

Convert representative JSON into modern C# classes or records, then audit nested models, nullable fields, numeric types, serializer attributes, and property names before using the code.

Class or sealed recordmodern C# model output

System.Text.Json · Newtonsoftpreserve original JSON property names

Nullable + numeric inferenceint · long · double · optional fields

Nested shape dedupeaudit each inferred C# property

Representative JSON—

Generated starter code—

—JSON root

—Object keys

—Max depth

—Generated lines

ReadyThis is a starter model inferred from one sample, not a complete contract.

Review optional fields, unions, nullability, numeric precision, naming conventions, custom scalars, validation rules, and framework annotations against your real API/schema before using generated code in production.

Modern C# model workbench

Generate configurable C# classes or records from the same JSON sample

Use the JSON already entered above, then choose serializer attributes, nullable-reference behavior, record/class style, namespace output, and inspect every inferred property before copying the model.

Browser-local · sample-based

Namespace (optional)Model styleJSON serializerGenerate

#nullable enable + nullable reference types C# 11 required for fields present and non-null in the sample init-only properties Detect ISO timestamps and GUIDs

—JSON root

—unique object models

—optional / nullable

—renamed properties

—generated lines

Generated C#

Field inference audit

JSON path	C# property	Type	Optional	Nullable

Copyable generation audit

Reading the current JSON sample…

Contract boundary. This is sample-based inference, not a substitute for an OpenAPI/JSON Schema contract. A sample cannot prove all fields, nullability rules, numeric ranges, polymorphism, validation attributes, converter settings, source-generation options, or future API shapes. The required option means “present and non-null in this sample,” not “required by the remote API.”

How to use this JSON to C# Converter

Paste JSON and create editable C# model classes locally with nested type inference.

What the generated code means

The generator infers a starter model from the values present in one sample JSON document. It cannot discover fields missing from the sample, API business rules, every possible union, framework conventions, or future schema changes, so review the result before production use.