JSON Formatter & Validator
Format JSON, check its syntax, and inspect nested data in one workspace. All JSON processing happens in your browser, with no server uploads.
JSON source editor
Format JSON and check syntax in one place
API responses and configuration files are easier to review with consistent indentation. Paste a JSON document to check its syntax as you edit, then format it for reading or minify it for copying. Switch to the tree view to explore objects and arrays without changing the source text.
How to use the JSON Formatter & Validator
- Paste your JSON into the editor.
- Review the validation result and correct any syntax errors.
- Choose Format JSON, Minify, or Show Tree View, then copy the result.
JSON Formatter & Validator example
{"service":"catalog","enabled":true,"regions":["au","us"]}Formatting puts each property and array item on its own indented line. Choose two spaces, four spaces, or tabs in the workspace.
Syntax checks and data representation
The tool uses JavaScript JSON parsing. Syntax validation does not check a schema or application rules. Formatting and minification parse and serialize the document: duplicate property names collapse to the last value, integer-like keys may reorder, and numbers beyond JavaScript’s safe integer range can lose precision. Keep long numeric identifiers as strings and retain your original source when exact representation matters.
JSON Formatter & Validator questions
Does formatting also validate JSON?
Yes. The tool checks JSON syntax before formatting. Invalid input stays in the editor so you can fix it without losing your text.
Can I format JSON containing comments?
This tool accepts strict JSON. Remove comments, trailing commas, and unquoted property names first. JavaScript objects and JSON5 are different formats.
Which JSON values are supported?
Objects, arrays, strings, numbers, booleans, and null are valid top-level JSON values. The editor validates all of them.