LahbabiGuide
Developer ToolsFree · No sign-up · Private

JSON Formatter & Validator

Free online JSON formatter and validator. Pretty-print, minify, sort and validate your JSON instantly with a clear, human-readable error report.

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JSON Formatter & Validator100% local · free

How to use JSON Formatter & Validator

  1. 1

    Paste your JSON into the input box — or type it directly; validation runs live.

  2. 2

    The formatted output appears instantly on the right. Fix any reported errors before continuing.

  3. 3

    Use the indent and sort options to match your preferred style.

  4. 4

    Click Copy or Download to save the formatted JSON.

Key features

Instant formatting as you type

Detailed syntax error reporting with line & column

Minify mode for compact output

Sort object keys alphabetically

Two-space or four-space indentation

Copy & download results in one click

Pro tip

In Chrome DevTools, paste a JSON response, then copy it and run it through the formatter for a clean, readable version you can share.

Read the JSON Formatter & Validator guide

What it is, how it works and when to use it — free, 2-minute read.

JSON Formatter & Validator — FAQ

Yes, it is completely free, with no sign-up and no usage limits. All processing happens locally in your browser.

Absolutely. Your JSON never leaves your device — formatting and validation happen locally, so you can safely work with private or sensitive data.

It means the text does not follow the JSON specification — usually a missing comma, quote or closing brace. The validator highlights the exact line and column of the problem.

Yes. Use the Minify mode to strip all whitespace and produce a compact string, which is handy for storage or transmission.

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