JSON Kit

JSON Tools for the AI Era

40+ free JSON utilities for developers — formatter, validators, converters, LLM repair tools, and more. 100% browser-side. No data sent to servers.

Core ToolsFree

JSON Formatter & ValidatorEssential
Format, beautify, and validate JSON instantly
JSON to TypeScriptPopular
Generate TypeScript interfaces from any JSON
JSON to Zod SchemaHot
Generate Zod validators from JSON samples
Fix LLM JSONAI
Repair malformed JSON from ChatGPT, Claude, etc.
Extract JSON from MarkdownAI
Pull JSON out of AI-generated markdown blocks
Describe to JSONAI
Describe your data structure, get sample JSON
JSON to OpenAI Schema
Convert JSON to OpenAI function call schema
JSON Diff
Semantically compare two JSON objects
JSONPath Tester
Test JSONPath expressions against live data
JSON to CSV
Convert JSON arrays to CSV spreadsheets

Converters & UtilitiesFree

JSON to Pydantic
Generate Python Pydantic models
JSON to Go Struct
Generate Go structs from JSON
JSON to Rust Struct
Generate Rust structs from JSON
JSON to Kotlin
Generate Kotlin data classes
JSON to Swift
Generate Swift Codable structs
JSON to Java POJO
Generate Java POJO classes
JSON to C# Class
Generate C# classes from JSON
JSON to GraphQL
Generate GraphQL schema from JSON
JSON to JSON Schema
Generate JSON Schema from samples
JSON to SQL
Generate SQL INSERT statements
JSON to Supabase
Generate Supabase table schema
JSON to YAML
Convert JSON to YAML format
YAML to JSON
Convert YAML to JSON format
JSON to XML
Convert JSON to XML format
JSON Flattener
Flatten nested JSON to dot notation
JSON Minifier
Strip whitespace to compress JSON
JSONL Viewer
View and split JSON Lines files
CSV to JSON
Convert CSV spreadsheets to JSON
JSON to Mock Data
Generate mock data from a JSON schema
JSON to .env
Convert JSON to .env variable format

Why JSON Kit?

100% Private

Every tool runs in your browser. Your data never touches our servers.

AI-era tools

Built for the workflows that did not exist 3 years ago — LLM repair, schema generation, AI output parsing.

Handles big files

Monaco Editor handles 50MB+ files without freezing. Built for real-world payloads.