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Free Online JSON Converter - Multi-Format Conversion

Input JSON
Converted ResultYAML
Ready

What Is a JSON Converter?

A JSON converter transforms JSON data into other formats — YAML, XML, or programming language entity classes. This free online tool lets you convert JSON to multiple output formats instantly, so you can work with data in whatever format your project needs.

Supported Conversions

  • JSON to YAML — convert JSON objects and arrays into clean YAML syntax for configuration files.
  • JSON to XML — transform JSON structures into well-formed XML with proper nesting.
  • JSON to Java Class — generate a Java POJO with private fields, getters, and setters.
  • JSON to Python Dataclass — generate a Python dataclass with type annotations.
  • JSON to TypeScript Interface — generate TypeScript interfaces with proper type mappings.
  • JSON to Go Struct — generate Go structs with JSON tags for marshaling.

When to Use

  • API integration — paste a JSON API response and get the corresponding entity classes for your language.
  • Configuration — convert between JSON and YAML for config files that prefer one format over the other.
  • Code generation — skip the boilerplate of writing classes by hand; let the tool generate them from your data structure.
  • Data exchange — convert JSON to XML when working with legacy systems that require XML input.

How to Use the JSON Converter

  1. Paste your JSON data in the input area.
  2. Select the target format from the dropdown menu.
  3. For code generation (Java/Python/TypeScript/Go), enter a class name.
  4. Click Convert and copy the result.

FAQ

1. Is my data sent to a server?

No. All conversion happens entirely in your browser. Your JSON never leaves your device.

2. Does the class generator handle nested objects?

Yes. The code generators create nested classes, dataclasses, interfaces, or structs for nested JSON objects automatically.

3. How are JSON types mapped to each language?

Strings map to String/str/string. Numbers map to double/int/float/float64. Booleans map to boolean/bool. Arrays map to List<>/list[]/Array<>/[]. Objects become nested types in each language.

4. Can I convert arrays of objects?

Yes. The converter handles both JSON objects and arrays of objects. For code generation, it uses the first object's structure to build the type definition.

5. What is the difference between Java Class and Python Dataclass generation?

Java generates a POJO with private fields, getters and setters. Python generates a @dataclass with type annotations. Both follow the idiomatic patterns of their respective languages.

6. Does the Go struct output include JSON tags?

Yes. The generated Go structs include json:"fieldname" tags for easy marshaling and unmarshaling with encoding/json.

7. Is there a limit on JSON size?

The converter processes JSON entirely in your browser's memory. Very large JSON files (megabytes) may impact performance, but typical API responses and config files work without issues.

How to Use

  1. Paste your JSON data into the input area.
  2. Select the target format from the dropdown (YAML, XML, Java, Python, TypeScript, or Go).
  3. Enter a class name for code generation formats (Java/Python/TypeScript/Go).
  4. Click Convert to generate the output in the selected format.
  5. Use the Copy button to copy the result to your clipboard.