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JSON Kit

JSON Kit

40+ free JSON utilities for developers, running 100% browser-side.
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JSON Kit provides 40+ free JSON tools for developers, including formatter, validator, converter to TypeScript/Zod/Pydantic, LLM JSON repair, diff, JSONPath tester, and more. All tools run entirely in the browser with no data sent to servers. Built for modern workflows like AI output parsing and schema generation, it handles large files with Monaco Editor and works offline.

Free
JSON Kit screen shot

How to use JSON Kit?

Visit jsonkit.co and browse the tool grid. Click any tool card to open its dedicated page. Paste or upload your JSON data, configure options if any, and get instant results. All processing happens locally in your browser, so no data is transmitted. You can copy or download the output directly.

JSON Kit 's Core Features

  • JSON formatter and validator with beautification
  • Convert JSON to TypeScript, Zod, Pydantic, Go, Rust, Kotlin, Swift, Java, C#
  • LLM JSON repair and extract from markdown
  • JSON to OpenAI schema generator
  • Semantic JSON diff and JSONPath tester
  • Flatten, minify, and convert between JSON, YAML, XML, CSV

    • JSON Kit 's Use Cases

  • Format and validate JSON during development
  • Generate TypeScript interfaces from API responses
  • Repair malformed JSON from ChatGPT or Claude
  • Convert JSON to YAML for configuration files
  • Compare two JSON objects to find differences
  • Generate mock data from JSON schema

    • JSON Kit 's FAQ

    Most impacted jobs

    Software Developer
    Data Engineer
    Backend Developer
    DevOps Engineer
    AI/ML Engineer

    JSON Kit 's Tags

    #JSON#Formatter#Validator#Converter#LLM Repair#Schema Generator#Developer Tools#Free

    JSON Kit 's Alternatives