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Developer · Runs in your browser

JSON Formatter

Format, validate, and minify JSON entirely in your browser.

Methodology

Counts use browser APIs where available (Intl.Segmenter). Abbreviations and unusual punctuation can vary. This is a utility estimate, not linguistic perfection.

What this tool does

Pretty-prints and validates JSON locally in your browser.

Developers use it to inspect API responses, config files, and debug parsing errors.

How to use it

  1. Paste minified or messy JSON.
  2. View formatted output with indentation.
  3. Fix syntax errors the validator reports (missing comma, quote, etc.).

When to use it

  • Reading a one-line API response.
  • Preparing JSON for documentation or tickets.
  • Teaching JSON structure without installing tools.

Limitations

  • Very large payloads may slow the browser tab.
  • Does not execute or schema-validate beyond syntax (use json-schema-generator for that).
  • Sensitive data stays local but visible on your screen — clear when done.

FAQ

JSON5 or comments?

Standard JSON only — comments are not valid JSON.

Copy formatted output?

Select from the result panel or use your browser copy shortcut.

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