Convert C# classes, records, and structs into JSON Schema, then jump straight into the Mock Generator to craft matching sample data.
Select which class or record should be treated as the root when generating the schema.
Parsing runs entirely in your browser. Your source never leaves the page.
Paste your C# DTOs to produce a JSON Schema instantly.
Supports classes, structs, records, annotations, nullable reference types, and generic collections.
This online C# class to JSON Schema converter helps you generate JSON Schema from real models (DTOs, structs, and classes) so you can validate payloads, share contracts, and generate mock JSON.
Step 1 – Paste your C# source
Step 2 – Select the Root class (if needed)
Step 3 – Review the JSON Schema output
definitions and $ref when your models reference other models.Step 4 – Validate or generate mock JSON
anyOf/oneOf/allOf), verify the result with a full validator like Ajv.Schema keyword support note
Generated schemas can include $ref and may be edited to include anyOf, oneOf, or allOf. For complex schemas, use a full JSON Schema validator and dereference before mock generation if needed.
Use these tools to validate schemas, generate mock payloads, format JSON examples, and keep code and contracts in sync.
Generate example JSON from your schema for testing, fixtures, and documentation.
Validate JSON against common schema keywords and find mismatches quickly.
Produce C# models with attributes directly from JSON.
Build schema from representative JSON samples to complement model-first schemas.
Explore schema examples and patterns for objects, arrays, enums, and constraints.
Clean up JSON examples before validating against schema or sharing docs.
The parser understands classes, structs, records (with primary constructors), auto-properties, backing fields, enums, and attributes such as JsonPropertyName, JsonProperty, and DataMember(Name=...). It respects nullable reference types, optional fields, collections, and dictionaries directly in the generated schema.
Primitives such as string, bool, int/double/decimal, DateTime/DateOnly/Guid map to the closest schema type and format. Arrays, List<T>, IEnumerable<T>, Dictionary<TKey, TValue>, Nullable<T>, and T? are converted into array/object/optional schema constructs. Unrecognized symbols fall back to references when they match another class or enum.
Yes. Modern features like records, init-only setters, nullable reference types, System.Text.Json annotations, and classic Newtonsoft.Json attributes are handled. The tool runs completely in your browser, so you can safely paste proprietary DTOs or API contracts.
After the schema is created, click "Generate Mock Data" to open the Mock Generator with your schema preloaded. Configure locales, array counts, and optional fields to instantly produce realistic payloads for docs or tests.