Developer tool
JSON Formatter & Validator
Format, validate, sort, and minify JSON instantly. Your data stays entirely in this browser.
About this tool
Make JSON readable and reliable
JSON is compact by design, but compressed or inconsistently indented data is difficult to inspect. This formatter adds predictable spacing and line breaks so nested objects, arrays, and values are easier to scan.
It also validates your input before producing output. If the syntax is invalid, you receive a focused error with a line and column when the browser can identify the exact position.
How it works
Format JSON in three steps
- 1Paste JSON
Add an object, array, or any valid JSON value.
- 2Choose an action
Format with your preferred indent or create a compact version.
- 3Use the result
Copy the output or download it as a ready-to-use .json file.
Common questions
JSON Formatter FAQ
Is my JSON uploaded anywhere?
No. Formatting, validation, sorting, and minification happen locally in your browser. UtilityBase does not receive or store the text you paste.
What does the JSON validator check?
It uses the browser’s standards-based JSON parser to check strings, numbers, objects, arrays, booleans, null values, commas, quotes, and nesting.
Can I minify JSON?
Yes. Choose Minify to remove unnecessary whitespace while preserving the same data structure.
Does sorting change array order?
No. The optional sort feature orders object keys alphabetically but preserves the original order of array items.