Format, minify, or validate JSON
- Paste JSON and choose an explicit action.
- Select two spaces, four spaces, or tabs for formatted output.
- Copy or download exactly the displayed result.
JSON Formatter and Validator
Format, validate, or minify JSON with native parser semantics and no server processing.
Input and results stay in browser memory in this tab. Nothing is uploaded, logged, saved, or added to the URL.
Enter text and choose an action.
Format readable JSON, create a compact representation, or validate syntax without changing the input. Standard JSON parsing preserves array order and insertion order but duplicate object keys resolve according to normal parser behavior.
How OpenFileTools processes it
Local processing, explicit choices.
A bounded UTF-8 string is passed to the browser's native JSON parser only after you choose an action. Formatting uses JSON.stringify without custom key sorting.
Questions, answered.
What is the difference between format and minify?
Formatting adds indentation for readability. Minifying removes insignificant whitespace while preserving parsed JSON values.
Does valid JSON have to start with an object?
No. Arrays, strings, numbers, booleans, and null are valid JSON roots.