Paste JSON to check its syntax instantly. Pinpoint errors by line and column, then format, minify, copy or download clean JSON—all without uploading your data.
Your JSON stays on your device and is never uploaded.
Paste your data into the editor and this online JSON validator checks it as you type. JSON is strict: one trailing comma, missing quote or unmatched bracket can break an API request or configuration file. Parsing errors include a useful line and column so you know where to look.
Jump directly to the reported position when a quote, comma, bracket, key or value is invalid.
Make nested data readable with your preferred indentation, or compact it for transport and storage.
Everything runs locally in your browser, making the tool suitable for sensitive development data.
It checks whether your text follows standard JSON syntax, including valid values, double-quoted property names, correct commas and matching braces and brackets.
Common causes include trailing commas, single-quoted strings, comments, unquoted property names, missing values and unmatched brackets.
Formatting adds line breaks and indentation for readability. Minifying removes unnecessary whitespace. Neither changes the underlying data.
Yes. It validates any standard JSON value, including objects, arrays, strings, numbers, booleans and null.
No. Validation, statistics, formatting and minification happen locally in your browser.
Keep working with data using these fast, free browser tools.