About
JSON toolkit

Online JSON tools for real development work

Format API responses, fix invalid data, compare documents, test paths and schemas, or generate typed models. Processing stays in your browser.

18 tools✓ Local processing✓ No login
JSON toolkit

Inspect and validate JSON

Format, repair, compare, query and validate the JSON you use in APIs, configuration and tests.

5 tools
{ }

JSON Formatter

Format, validate and minify JSON data

→FX

JSON Repair

Fix common JSON quote, comma and property errors

→≠

JSON Diff

Compare two JSON documents by key path

→$.

JSONPath Tester

Query JSON nodes and values with path expressions

→JS

JSON Schema Validator

Validate JSON structure and field rules against a schema

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JSON toolkit

Convert JSON and configuration data

Move between JSON, YAML, TOML, XML and CSV without uploading source data.

4 tools
YA

YAML JSON Converter

Convert, validate and format YAML and JSON

→TO

TOML JSON Converter

Convert, parse and format TOML and JSON

→XM

XML JSON Converter

Convert XML and JSON while preserving attributes and nodes

→CSV

CSV to JSON

Convert CSV tables into JSON arrays

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JSON toolkit

Generate typed models from JSON

Turn representative JSON into practical starting models for popular programming languages.

9 tools
TS

JSON to TypeScript

Generate TypeScript interfaces from JSON

→JV

JSON to Java

Generate Java POJOs and Jackson field mappings from JSON

→PY

JSON to Python

Generate Python Pydantic models from JSON

→GO

JSON to Go Struct

Generate Go structs and json tags from JSON

→C#

JSON to C#

Generate C# classes and System.Text.Json mappings

→KT

JSON to Kotlin

Generate Kotlin data classes from JSON

→SW

JSON to Swift

Generate Swift Codable structs from JSON

→DT

JSON to Dart

Generate Dart and Flutter model classes from JSON

→RS

JSON to Rust

Generate Rust structs and Serde mappings from JSON

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Local processing

A private JSON workflow in one place

Each utility has its own focused URL, while this collection keeps related tasks connected so you can move from formatting to validation or code generation without starting over.