JSON Formatter, Validator & Beautifier
Validate JSON syntax in real-time, pinpoint parse errors, format with custom indentation, minify payloads, or explore with a nested tree view.
{
"example": true,
"project": "Demo project",
"tasks": [
"format",
"validate",
"minify"
],
"settings": {
"indent": 2
}
}Frequently Asked Questions
Why did my JSON fail validation?
Common JSON errors include using single quotes instead of double quotes around keys and strings, trailing commas after the last element of an array or object, or unquoted keys. Valid JSON strictly requires double quotes.
Is it safe to format sensitive JSON data with ToolOut?
JSON formatting runs in your browser. Use sanitized examples and avoid pasting API keys, authentication tokens, or personal records into online tools.
Fix JSON syntax before formatting or exporting
- Paste JSON or choose a JSON file. The initial example is demonstration data, not ToolOut usage statistics.
- If validation fails, inspect the reported parse error. Use double quotes around keys and strings, remove trailing commas, and close each bracket.
- Choose indentation, key sorting or minification. Copy or download only a valid result. Switch to tree view to inspect nested objects and arrays.
Try this example
Invalid: {"name":"Asha",}. Valid: {"name":"Asha"}. Removing the trailing comma fixes this example. Minification removes whitespace outside strings; it does not compress a file into ZIP or gzip.
Privacy and limitations
Formatting runs locally using JavaScript JSON.parse and JSON.stringify. Numbers beyond JavaScript's safe integer range can lose precision: keep identifiers as quoted strings. Duplicate object keys are not retained. This checks JSON syntax, not compliance with a JSON Schema. Prefer sanitized samples over credentials or personal data.