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JSON Tool

Validate JSON, format it for readability, minify it for transport, or sort keys for consistent diffs. Runs locally in your browser.

Category: Developer · URL: /tools/json-tool.html
Input JSON
Tip: works with objects, arrays, strings, numbers, booleans, and null.
Input: 0 chars
Output: 0 chars
Output
Output updates only when you click a button (to stay fast for large inputs).
Related tools: XML Checker · Cron Checker · Cron Formatter · JWT Converter · Base64 Encode/Decode · Kubernetes YAML Generator
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Paste your JSON, choose options, then format/minify/sort. If the JSON is invalid, you’ll see an error.

  1. Paste JSON into the input box.
  2. (Optional) Set indent size and enable Sort keys.
  3. Click Pretty or Minify (or Validate for a quick check).
  4. Copy the output when you’re done.
Keywords this page targets (natural cluster): json tool, json formatter, json pretty print, json validator, validate json online, minify json, json minifier, sort json keys, canonicalize json, beautify json, fix invalid json, json parse error checker, json stringify online, json lint, format json with indent, compact json output, json key order, json normalize
Secondary intents covered: Check whether a JSON payload is valid before sending it to an API, Pretty-print JSON for debugging logs and readability, Minify JSON to reduce size for transport or storage, Sort object keys to make diffs stable in code reviews, Quickly locate parse errors with a clear error message, Copy cleaned JSON output for pasting into configs or tests, Generate a clean, consistently-indented JSON snippet

FAQ

Is this JSON tool safe for sensitive data?

Yes—everything runs in your browser and the tool does not send your JSON anywhere.

What’s the difference between Pretty and Minify?

Pretty adds indentation and newlines for readability; Minify removes whitespace to make JSON as small as possible.

What does “Sort keys” do?

It sorts object keys alphabetically (recursively) so the output is stable for diffs and reviews.

Why am I getting an “Unexpected token” error?

Your input isn’t valid JSON—common causes are trailing commas, unquoted keys, or single quotes instead of double quotes.

Does sorting keys change arrays?

No—array element order is preserved; only object property order is sorted.

Can this handle large JSON?

Usually yes, but extremely large or deeply nested JSON may be slow or hit browser limits.

Will formatting change my data types?

No—the tool parses and re-serializes JSON, preserving values and types; only whitespace/key order may change.