Free JSON Formatter, Validator & Tree Viewer

Format, validate, beautify, and minify JSON data with interactive tree navigation, syntax highlighting, and instant error line detection.

🔒 100% In-Browser & Zero Server Uploads

About JSON Formatter & Validator

Parses, cleans, and formats raw JSON into human-readable indented structures with 2-space, 4-space, or tab indentation. Locates syntax errors with exact line and column numbers.

How to Use JSON Formatter & Validator Online

  1. Paste your raw JSON text or upload a .json file.
  2. The tool validates syntax in real-time and reports any parsing errors.
  3. Select 2-space, 4-space, or Minify mode.
  4. Click Copy Output or Download JSON.

Frequently Asked Questions

Is it safe to format JSON containing API keys or private data?
Yes. All parsing executes locally inside your browser via native JSON.parse. Nothing is ever sent to any remote server.