JSON Formatter & Validator
Format, validate and minify JSON with precise error messages showing the line and column of any syntax problem.
About JSON Formatter
Paste raw JSON to pretty-print it with consistent indentation, or minify it to the smallest valid payload. If the JSON is malformed you get the exact line and column of the problem rather than a generic parse error, which makes tracking down a stray comma much faster.
How to use it
- Paste your JSON into the input panel.
- Choose an indent size, then Format or Minify.
- Fix any reported error at the line and column shown.
- Copy or download the result.
Frequently asked questions
Why is my JSON invalid?
The three most common causes are a trailing comma after the last item, single quotes instead of double quotes around keys and strings, and unescaped line breaks inside a string value.
Does formatting change my data?
No. Only whitespace changes. Key order, values and types are preserved exactly, because the tool parses and re-serialises with the standard JSON parser.
Is my data private?
Yes. Parsing happens in your browser. API responses, tokens and customer records pasted here are never transmitted anywhere.
Trending guides
In-depth reads that go beyond the calculator.
- Trending6 min read
SIP Calculator guide
A Systematic Investment Plan is a standing instruction to put a fixed amount into a mutual fund on the same date each month. That is the whole idea. It is not a product you buy, not an asset class, and not a scheme with a guaranteed rate — it is a schedule. The returns come from whatever the underlying fund holds.
- 3 min read
BMI Calculator guide
Body Mass Index is weight in kilograms divided by height in metres squared. That is the whole calculation. It was devised in the 1830s by the Belgian statistician Adolphe Quetelet, who was explicitly describing populations rather than assessing individuals — a distinction that matters enormously and gets lost constantly.
- 3 min read
Percentage Calculator guide
Almost every percentage problem is one of four shapes. Knowing which one you are looking at is most of the work, because each has a different formula and mixing them up is where the wrong answers come from.