JSONKitHub

    All JSON Tools

    Twelve free, browser-only JSON tools covering formatting, validation, comparison, encoding, and conversion. Pick a tool below or jump straight to one by category — every tool runs entirely client-side, so your data never leaves your device.

    Analysis

    JSON Compare

    Compare two JSON documents side-by-side and highlight differences. Use it to diff API responses or config files before merging.

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    Formatting

    JSON Formatter

    Beautify minified or compact JSON into readable, indented output. Use it when debugging a dense API payload by eye.

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    JSON Minify

    Strip whitespace and formatting to shrink JSON file size. Use it to reduce payload size before shipping to production.

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    Validation

    JSON Validator

    Check JSON syntax and structure, with line-level error messages. Use it to catch malformed JSON before it reaches your app.

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    Conversion

    JSON to YAML

    Convert JSON into YAML while preserving structure. Use it when migrating config files to a YAML-based toolchain.

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    YAML to JSON

    Convert YAML files into valid, structured JSON. Use it when an API or script only accepts JSON input.

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    JSON to TOON

    Convert JSON to Token-Oriented Object Notation to cut LLM token usage by 30-60%. Use it before sending large JSON payloads to an AI prompt.

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    TOON to JSON

    Convert TOON-format data back to standard JSON. Use it to decode a token-efficient payload for a regular JSON consumer.

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    Encoding

    JSON Stringify

    Convert a JSON object into an escaped string literal. Use it when embedding JSON inside another string or config value.

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    JSON Parse

    Parse a raw JSON string back into a structured, readable object. Use it to inspect stringified JSON pulled from logs or storage.

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    JSON Escape

    Escape special characters in a JSON string for safe embedding. Use it before inserting raw text into a JSON value.

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    JSON Unescape

    Decode an escaped JSON string back to readable text. Use it to make an escaped payload human-readable again.

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