JSON Formatter
Format, validate, and analyze JSON with professional tools and insights.
JSON Formatting Examples
Unformatted Input
{"name":"John","age":30,"city":"New York"}Pretty Output
{
"name": "John",
"age": 30,
"city": "New York"
}Additional Examples
Formatting Minified JSON
Input:
{"name":"Alice","age":30,"city":"New York"}
Output:
{
"name": "Alice",
"age": 30,
"city": "New York"
}Converts a compact, single-line JSON string into a human-readable format with indentation.
Validating and Formatting Complex JSON
Input:
[ { "id": 1, "items": [ "apple", "banana" ] }, { "id": 2, "active": true, "config": null } ]
Output:
[
{
"id": 1,
"items": [
"apple",
"banana"
]
},
{
"id": 2,
"active": true,
"config": null
}
]Formats nested arrays and objects with consistent indentation, handling different data types (number, string, boolean, null).
Detecting Syntax Errors
Input:
{
"name": "Bob",
"age": 40 // Missing comma
"isStudent": false
}The tool will identify the missing comma after the 'age' field and report a validation error.
About this tool
Format, validate and beautify JSON instantly in your browser. Free online JSON formatter with validation, search & statistics — no signup, no uploads. JSON Formatter runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- JSON Formatter is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use JSON Formatter?
Open JSON Formatter, enter or paste your input, and copy the result. The page works without an account.
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