JSON Formatter and Validator

Yes. As you type, the tool parses the input and shows a green 'Valid JSON' badge or the parser's error message. When the position is known it adds a line and column hint so you can jump straight to the problem.

No. Formatting, validation and minifying all happen locally in your browser using the built-in JSON parser, so your data never leaves your device. That makes it safe for API responses and configs that contain secrets.

Pretty mode indents the JSON across multiple lines so people can read and review it. Minify removes every optional space and newline to produce the smallest valid string, which is what you want for storage or sending over the wire.

Yes. Turn on 'Sort keys' to order keys alphabetically at every nesting level. Array element order is always preserved, since order is meaningful in arrays. Sorting keys makes two versions of the same object diff cleanly.

Two or four spaces in pretty mode, whichever your team prefers. In minify mode the indent setting is disabled because all whitespace is stripped.

When the parser reports a character position for the error, the tool counts newlines up to that point to translate it into a line and column. That points you at the exact bracket, comma or quote that broke parsing.

It reformats whitespace and, if you ask, key order, but parsing does normalize numbers. A value like 1.0 becomes 1 and a very large integer beyond safe precision may lose exactness, because JSON numbers are read as standard doubles.

No. This is a strict JSON formatter, so comments, single quotes and trailing commas are reported as errors. Those belong to JSON5 or JavaScript object literals, not to the JSON specification.

Yes, within your device memory. Because it runs in the browser, very large documents depend on available RAM, but typical API payloads format instantly.