JSON Formatter CSharp

Developer-focused tool that formats JSON, validates syntax, and generates C# POCO classes from data samples.

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2,484+
Total Calculations Run
< 15ms
Browser Execution Speed
100%
Client-Side Privacy
4.9 / 5.0
User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how JSON Formatter CSharp processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}
Computed Result { "id": 1, "status": "active", "roles": [ "admin" ] }
Execution Mode Client-Side In-Browser JS
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About This Tool

The tool formats JSON content and validates syntax while offering an optional C# code generator. Conceptually, it parses the input, infers a type system from the data, and outputs either a clean JSON string or a set of C# POCO classes. This helps developers keep payloads consistent and ensures data models reflect actual API structures. Users supply JSON input and choose between a pretty-printed output or a minified form; they may also request POCO class generation with an optional namespace. The generated code adheres to common C# conventions: properties use PascalCase, nullable types are emitted where appropriate, and collections become List when arrays are detected. The tool relies on standard JSON parsing logic and simple type-mapping heuristics to produce predictable results. It is suitable for API client generation, server stubs, data model creation, and quick validation workflows. The output can be copied, exported, or embedded in a build pipeline. Core value comes from reducing manual reformatting, speeding up model creation, and providing consistent, testable representations of JSON data in C# projects.

How to Use

  1. Provide a JSON input string in the input box.
  2. Choose the desired format_style (pretty or minified) and optional generate_poco flag.
  3. If generating POCOs, specify an optional namespace; otherwise leave as default.
  4. Run the tool to produce either formatted_json, poco_classes, or both.
  5. Copy or export the outputs into the target project; review any generated types for integration needs.
How to use json formatter c#

Frequently Asked Questions

Find Quick Answers

What JSON types are supported?
All standard JSON types are supported: objects, arrays, strings, numbers, booleans, and null. Nested structures are mapped to nested C# classes or collections, with arrays becoming List when appropriate. Mixed-type arrays default to object.
Can it generate POCOs for nested structures?
Yes. The generator creates nested classes to reflect object hierarchies and uses PascalCase for property names. Nullable types are used when values can be missing or null to align with typical C# patterns.
Does it validate against a JSON Schema?
The tool validates JSON syntax and structure. It does not perform full JSON Schema validation by default, though you can use the generated POCOs as a starting point for schema-driven validation in your project.
How should I handle arrays with heterogeneous items?
Heterogeneous arrays are mapped to List to preserve all possible types. If uniform item types are detected, the tool uses List with the inferred element type for stronger typing.

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