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JSON Formatter & Validator

Beautify or minify JSON, sort keys for stable diffs, and validate against JSON Schema. Copy the formatted output or download a .json file.

Input JSON

Size: 0.06 KBObjects: 2Arrays: 0Keys: 4

JSON Schema (Optional)

Formatted JSON

{
  "example": "Hello, World!",
  "isValid": true,
  "nested": {
    "a": 1
  }
}
TL;DR — format, validate, and export JSON in your browser

Paste or upload JSON, pick an indent, choose Beautify or Minify, toggle Sort keys for stable diffs, validate against a JSON Schema, then copy or download. Everything runs client‑side — no uploads.

JSON Formatter & Validator – Beautify, Minify & Validate JSON Online Free

Paste JSON to format, beautify, or minify it instantly. This free online JSON formatter validates syntax, optionally validates against a JSON Schema, sorts keys for cleaner diffs, and lets you download the output — all running locally in your browser with no uploads.

For teams that care about clean diffs, the tool includes a Sort keys option. It recursively orders object keys so the output is deterministic. That means smaller, more focused diffs in Git and code review; changes reflect real edits, not incidental reordering. Pair that with a fixed indent and you’ll eliminate the noise that slows code reviews down. If you need a compact file for production or network testing, switch to Minify and the tool will remove whitespace while preserving the exact data.

Validation is built in, so you can catch mistakes before they ship. Paste a JSON Schemato validate as you type, or disable live checks and validate on demand when you’re ready. If you don’t have a schema handy, click Generate Schema to create a sensible starting point from your current JSON; then refine it to your needs. A small stats panel shows you object and array counts, total keys, and the byte size of the minified payload — a practical way to keep an eye on growth over time.

This page also plays nicely with the rest of your workflow. Need to compare two versions of a payload? Open the Difference Checker for a line‑by‑line diff. Converting data for a spreadsheet or ingesting CSV exports? Use CSV to JSON and JSON to CSV. If you’re prepping text before formatting, the Advanced Text Cleaner can normalize whitespace and stray characters, and the Regex Tester helps you craft patterns for quick find‑and‑replace.

Everything runs locally — no data leaves your device. That makes this formatter suitable for sensitive payloads, internal API responses, logs, and configuration files you can’t upload elsewhere. It’s a straightforward, dependable utility built to save you time without adding friction to your day.

JSON formatter vs JSON validator – what's the difference?

Formatting (also called beautifying or pretty-printing) fixes indentation and whitespace so JSON is human-readable. It does not change the actual data values — it only adjusts presentation. Minifying does the reverse: it strips all whitespace to produce the smallest possible payload for production APIs and network transport.

Validation is a separate step. Basic JSON syntax validation checks that your JSON is parseable — correct brackets, no trailing commas, no unquoted keys. Schema validation goes further: it checks that your data matches a JSON Schema definition, verifying required fields, types, and value constraints. Use this tool for both: format first to make the structure readable, then validate to catch data errors before they reach production.

Key features of this JSON formatter & validator

  • Beautify or minify JSON instantly with 2‑ or 4‑space indent
  • Recursive Sort keys for deterministic output and clean diffs
  • Live JSON validation against JSON Schema (or validate on demand)
  • Generate a starter JSON Schema from sample data
  • Size and structure stats (objects, arrays, keys, minified bytes)
  • Upload .json/.txt, paste from clipboard, copy or export
  • 100% client‑side — nothing is uploaded

Tips

  • Turn on Sort keys before committing to keep PR diffs easy to scan.
  • Minify for production payloads and network tests; Beautify for logs and reviews.
  • If validation gets noisy, disable validate‑while‑typing and validate on demand.
  • Use a fixed indent (2 or 4) across your team to avoid churn in diffs.

Frequently asked questions

Is my JSON uploaded anywhere?
No. Everything happens in your browser — safe for private payloads.
Beautify vs. Minify — what should I use?
Beautify adds indentation for readability; Minify strips whitespace for smaller, faster payloads.
Can I validate against a JSON Schema?
Yes. Paste a schema to validate live or on demand. You can also Generate Schema from your current JSON and refine it.
How do I make diffs stable for code review?
Enable Sort keys and stick to a fixed indent. That keeps diffs focused on real changes, not key order.
How do I fix invalid JSON online for free?
Paste your JSON into the formatter. It will highlight errors and show the exact line and character position of any JSON syntax problem so you can fix it quickly.
How do I pretty print JSON in a browser?
Paste your minified JSON, select Beautify, and choose a 2-space or 4-space indent. The output is immediately readable and ready to copy — no software installation needed.
Is this JSON formatter free to use?
Yes. The JSON Formatter & Validator is completely free. No login, no account, no limits — just paste and format.
Can I format large JSON files online?
Yes. The tool runs entirely in your browser and handles large JSON payloads well. For very large files, performance depends on your device's available memory.

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