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JSON to C# Class Converter

· Last updated：2026-06-20

Convert JSON data into C# classes with PascalCase properties, JsonPropertyName attributes, and nested type inference

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Written by the Elysia Tools team
JSON107

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Development
Input types
textarea, text, checkbox
Output type
text
Sample coverage
4
API ready
Yes

Overview

The JSON to C# Class Converter simplifies .NET development by instantly transforming raw JSON payloads into strongly-typed C# classes. It automatically infers nested types, generates PascalCase properties, applies JsonPropertyName attributes for seamless serialization, and supports nullable properties to match your API specifications.

When to use

  • When integrating external REST APIs into a .NET application and you need to quickly generate Data Transfer Objects (DTOs).
  • When modeling complex, deeply nested JSON payloads into structured C# classes without manual typing.
  • When configuring System.Text.Json serialization with proper property mapping attributes and nullable type safety.

How it works

  1. 1Paste your raw JSON payload into the JSON Input field.
  2. 2Specify the Root Type Name for your main class and toggle the Nullable Properties option if your API contains optional fields.
  3. 3Click convert to generate the C# class structure with PascalCase properties and JsonPropertyName attributes.

Use cases

  • Generating DTOs for HttpClient API integrations in ASP.NET Core projects.
  • Creating configuration binding classes for appsettings.json files.
  • Mapping third-party webhook payloads to strongly-typed C# models.

Compare alternatives

  • Convert JSON Schema JSON/YAML definitions into ready-to-use Zod schemas with nested objects, arrays, enums, and common validation rules

  • Convert structured service logs into Mermaid or PlantUML sequence diagrams, with optional latency and error annotations

  • Convert JSON data into Go struct definitions with json struct tags, exported PascalCase fields, and nested type inference

Who it's for

Best for

  • Convert JSON text in the browser.
  • Repeatable jobs with JSON text and the same settings every time.
  • Jobs where the output is plain text.

Not ideal for

  • Fully automated batch jobs — this page is built for interactive use; use the API endpoint for scripts.
  • Content in other formats — this tool expects JSON text.

Edge cases & common failures

  • Trailing commas or single quotes

    Strict JSON parsers reject them — remove trailing commas and switch to double quotes before validating or formatting.

  • Very large files

    Large files take longer and can hit browser memory limits — try a smaller sample first.

  • Skipping the output check

    Compare the first rows or pages of the output with the input before using it in production.

Examples

1. Generating API Response DTOs

Backend Developer

Background

A developer is integrating a third-party weather API that returns a complex JSON payload with nested coordinates and daily forecasts.

Problem

Manually writing C# classes for a nested 50-line JSON response is tedious and prone to naming mismatches during deserialization.

How to use

Paste the weather API JSON response into the input area, set the Root Type Name to 'WeatherResponse', and enable Nullable Properties.

Root Type Name: WeatherResponse, Nullable Properties: True

Outcome

A set of clean C# classes with PascalCase properties, matching JsonPropertyName attributes, and nullable types for optional fields.

2. Mapping App Configuration Files

DevOps Engineer

Background

An engineer needs to bind a custom JSON configuration file to a strongly-typed options class in a .NET worker service.

Problem

The configuration JSON uses camelCase keys, which need to be mapped to standard C# PascalCase properties without losing binding compatibility.

How to use

FAQ

Does the converter support nested JSON objects?

Yes, it automatically detects nested objects and arrays, generating separate, strongly-typed C# classes for them.

What JSON serializer attributes are generated?

The converter generates JsonPropertyName attributes to map original JSON keys to PascalCase C# properties.

Can I make the generated properties nullable?

Yes, enabling the Nullable Properties option adds the ? modifier to C# types to handle optional JSON fields.

What is the default name of the main generated class?

The default root class name is 'Root', but you can customize this using the Root Type Name configuration field.

Does this tool support C# record types?

The tool generates standard C# classes with properties, which can be easily adapted to records or structs in your codebase.

Hub

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Input the configuration JSON, set the Root Type Name to 'AppConfig', and leave Nullable Properties unchecked.

Root Type Name: AppConfig, Nullable Properties: False

Outcome

A C# class structure named AppConfig with properties decorated with JsonPropertyName attributes matching the camelCase JSON keys.

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