Developer Tool
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    Free JSON Formatter & Validator

    Beautify, minify, and validate JSON instantly. Supports side-by-side view, error highlighting, and customizable indentation. Browser-based — completely private.

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    4.9 Rating
    JSON Formatter & Validator
    Format, minify, and validate JSON
    Valid JSON
    Indent:
    6 lines • 112 chars

    JSON Basics Every Developer Should Know

    JSON supports 6 data types: strings (in double quotes), numbers, booleans (true/false), null, arrays ([ ]), and objects (). Valid JSON must have all keys as double-quoted strings, no trailing commas, and no comments.

    How to Use This Tool

    1
    Paste Your JSON
    Paste your raw JSON (minified or formatted) into the input area on the left.
    2
    Click Beautify
    Click 'Beautify' to format with proper indentation, or 'Minify' to compress.
    3
    Check Validation
    The 'Valid/Invalid JSON' badge shows instantly. Error details appear below if invalid.
    4
    Copy Output
    Click 'Copy' to copy the formatted JSON.

    Frequently Asked Questions

    JSON (JavaScript Object Notation) is a lightweight text format for storing and transporting data. It's human-readable and language-independent. REST APIs, web applications, and configuration files use JSON extensively.

    Common JSON errors: missing quotes around keys, trailing commas (not allowed in JSON), using single quotes instead of double quotes, unescaped special characters in strings, and missing closing brackets. Our validator shows the exact error line and message.

    Standard JSON is strict — no comments, no trailing commas, keys must be quoted. JSON5 is an extension that allows JavaScript-like syntax: comments, trailing commas, unquoted keys, and more. Most APIs use standard JSON.

    Paste your JSON into our formatter above — if it's valid, the output shows the formatted version and you'll see 'Valid JSON'. If there's an error, the specific error message and location are shown below the input.

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