JSON Formatter

Loading...

JSON Formatter & Validator — Beautify, Minify and Check JSON Online

Format messy single-line JSON into clean, indented, readable output — or minify it back down for compact transport. The built-in validator pinpoints syntax errors instantly, and the key-sorting option gives you deterministic, diff-friendly output for config files and API fixtures.

Your data is formatted entirely in your browser. API responses, customer data, tokens, and internal payloads are never transmitted anywhere — paste freely, even when working with sensitive production data. Developer-focused tools on PureKit are lightweight and load fast, with no ads interleaved in the editing area.

How to format JSON

  1. Paste your JSON into the input editor, or type it directly.
  2. Click Format to beautify with indentation, or Minify to strip all whitespace.
  3. Use Validate to check syntax — errors are reported immediately.
  4. Optionally sort object keys alphabetically for stable, comparable output.
  5. Copy the result with one click.

Frequently asked questions

Is my JSON data sent to a server?

No. Parsing and formatting happen entirely in your browser with the native JSON engine. Nothing you paste ever leaves your machine — this matters when working with API keys, customer records, or production data.

What is the difference between formatting and minifying?

Formatting (beautifying) adds line breaks and indentation to make JSON readable for humans. Minifying removes all unnecessary whitespace to make the file as small as possible — ideal for shipping over the network or storing in environment variables.

How do I find where my JSON is broken?

Run the validator. It reports the exact parse error and position, which is usually a trailing comma, a missing quote, or unquoted keys. Fix and re-run until it validates.

Why would I sort JSON keys?

Sorted keys make JSON output deterministic, so two objects with the same data produce byte-identical text. That makes diffs meaningful, checksums stable, and config files easier to review.

Does it support large JSON files?

Yes — multi-megabyte payloads format quickly since everything runs at native JavaScript speed on your device, with no upload or download round-trip.

Related tools

YAML Formatter
Format, minify, validate YAML, and convert between YAML and JSON
SQL Formatter
Format, minify, and beautify SQL queries with multiple dialect support
Base64 Codec
Encode/decode text and files to Base64 with URL-safe mode

PureKit · json · Free online tool — files processed locally in your browser, no upload.