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 instantlyJSON to TypeScriptPopular
Generate TypeScript interfaces from any JSONJSON to Zod SchemaHot
Generate Zod validators from JSON samplesFix LLM JSONAI
Repair malformed JSON from ChatGPT, Claude, etc.Extract JSON from MarkdownAI
Pull JSON out of AI-generated markdown blocksDescribe to JSONAI
Describe your data structure, get sample JSONJSON to OpenAI Schema
Convert JSON to OpenAI function call schemaJSON Diff
Semantically compare two JSON objectsJSONPath Tester
Test JSONPath expressions against live dataJSON to CSV
Convert JSON arrays to CSV spreadsheetsConverters & UtilitiesFree
JSON to Pydantic
Generate Python Pydantic modelsJSON to Go Struct
Generate Go structs from JSONJSON to Rust Struct
Generate Rust structs from JSONJSON to Kotlin
Generate Kotlin data classesJSON to Swift
Generate Swift Codable structsJSON to Java POJO
Generate Java POJO classesJSON to C# Class
Generate C# classes from JSONJSON to GraphQL
Generate GraphQL schema from JSONJSON to JSON Schema
Generate JSON Schema from samplesJSON to SQL
Generate SQL INSERT statementsJSON to Supabase
Generate Supabase table schemaJSON to YAML
Convert JSON to YAML formatYAML to JSON
Convert YAML to JSON formatJSON to XML
Convert JSON to XML formatJSON Flattener
Flatten nested JSON to dot notationJSON Minifier
Strip whitespace to compress JSONJSONL Viewer
View and split JSON Lines filesCSV to JSON
Convert CSV spreadsheets to JSONJSON to Mock Data
Generate mock data from a JSON schemaJSON to .env
Convert JSON to .env variable formatWhy 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.