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JSON Formatter Online

Paste JSON to pretty-print, minify, validate, and optionally sort object keys. Everything runs locally in your browser (no uploads).

Category: Developer · URL: /tools/json-formatter-online.html
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use this formatter to clean up JSON for debugging, reviews, or production.

  1. Paste JSON into the input box.
  2. Choose indent and options (Sort Keys / Lenient / Auto-format).
  3. Click Format (pretty) or Minify (compact), or Validate.
  4. Copy the result from the output box.
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Secondary intents covered: Pretty-print messy JSON to make it readable, Minify JSON to reduce payload size, Validate JSON and spot parse errors quickly, Sort object keys to produce stable diffs in git, Copy formatted/minified JSON to the clipboard, Convert between minified JSON and indented JSON, Handle JSON-like input that contains comments or trailing commas (lenient mode), Swap input/output to keep iterating on transformations

FAQ

Does this JSON formatter upload my data?

No. Formatting and validation run locally in your browser.

What’s the difference between Format and Minify?

Format adds indentation and newlines for readability; Minify removes whitespace to make JSON compact.

Can I sort JSON keys?

Yes—enable Sort keys (deep) to alphabetize keys at every object level.

Can it handle JSON with comments or trailing commas?

Standard mode is strict JSON. Turn on Lenient to strip //, /* */ comments and trailing commas before parsing.

Why do I get “Unexpected token” errors?

Usually it’s invalid JSON (single quotes, unquoted keys, trailing commas in strict mode, or a missing brace). Enable Lenient if your input contains comments/trailing commas.

What indent options are supported?

Choose 2 spaces, 4 spaces, or tabs from the Indent menu.

Will formatting change key order?

Without sorting, output typically follows the input’s insertion order. With sorting enabled, keys are reordered alphabetically.