{ }Free
JSON formatter
Validate JSON and format it with readable indentation.
Validate JSON syntax and format valid JSON with two-space indentation. This makes nested objects and arrays easier to read. Invalid JSON produces an error instead of a formatted result; all parsing happens in your browser.
How to use
- Paste JSON into the input area.
- Run the formatter to check syntax and add indentation.
- Copy or download the formatted JSON.
Worked example
Example input
{"name":"Ada","active":true}Example result
{
"name": "Ada",
"active": true
}Limitations and details
JSON requires double-quoted strings and does not allow comments or trailing commas. This tool checks syntax, not a JSON Schema. JavaScript number precision applies; large integers may lose precision, and duplicate object keys keep only the final value.
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.