Free, browser-based utilities for everyday developer workflows

JSON Formatter & Validator

Paste JSON, validate it, and format or minify it. All validation happens in your browser - nothing is sent to a server.

Use cases

Format JSON for API logs

Explore more in the Use cases library.

  • Validate JSON and show errors quickly.
  • Prettify or minify for readability or transport.
  • Sort keys for stable diffs and reviews.

Works best with JSON objects and arrays - perfect for API responses, configs, and test data.

Quick help (examples & shortcuts)
  • Prettify: Validate + pretty-print using the selected indentation.
  • Minify: Validate + compact output (useful before sending over the wire).
  • Sort keys: Optional deep sort for stable diffs and reviews.
  • Open in tools: Send output directly to JSON <-> CSV or JSONPath Tester.
Formatter
Shortcuts: Ctrl + Enter prettify, Ctrl + Shift + Enter minify

JSON Input

Status: Not validated Stats: --

Output

Output: -- Size: --
Next: JSON Diff JSON <-> YAML JSON <-> CSV

How to use JSON Formatter & Validator

Paste JSON into the input editor and click Prettify to validate and format it with your chosen indentation, or click Minify for a compact single-line output. Enable Sort keys for stable, diff-friendly output.

Common use cases

Developers use this to quickly inspect minified API responses and config files. QA teams use it to prettify payloads for readability in bug reports, and DevOps engineers use it to validate JSON manifests and CI pipeline definitions before committing them.

Why run this in your browser?

All processing happens locally in your browser. Your data never leaves your machine, making it safe for sensitive payloads, internal API responses, and confidential configurations.