ChistStudioWhat this tool checks
JSON looks simple but has strict rules: double-quoted keys, no trailing commas, no comments, and specific escaping for special characters inside strings. This tool parses your input with the browser's native JSON parser and reports exactly where parsing failed, so you don't have to eyeball a wall of text hunting for a missing comma.
Pretty-print vs minify
Use pretty-print while developing or debugging, when you need to actually read the structure. Switch to minify before shipping a payload over the wire in production, since every byte of whitespace adds to response size and latency at scale.
Frequently asked questions
Why does my JSON fail to parse?
Common causes: a trailing comma after the last item, single quotes instead of double quotes, missing quotes around keys, or an unescaped quote inside a string. Standard JSON also doesn't allow comments.
What is the difference between pretty-printing and minifying JSON?
Pretty-printing adds indentation for readability. Minifying strips all unnecessary whitespace to shrink payload size, which matters for production API responses.
Is JSON the same as a JavaScript object?
JSON is inspired by JavaScript object syntax but is stricter and language-independent: it requires double-quoted keys and disallows functions, undefined, comments, and trailing commas.