json formatter online
Format, validate, and minify JSON directly in your browser
Paste JSON and get a formatted or minified version instantly. Syntax validation happens locally in the browser as you type.
Useful for API payloads, config files, mock data, and debugging malformed JSON.
Sort object keys
JSON input
Formatted output
Switch between pretty output and minified output without leaving the page.
Need more quick data utilities during setup work?
DartShell pairs these browser-side helpers with SSH, file transfer, and remote management workflows on Mac.
What this JSON formatter helps with
Validate JSON before using it
Catch syntax issues quickly before a payload goes into your API client, app config, or test data.
Toggle between readable and compact output
Use formatted output for inspection and minified output for compact payloads or inline values.
Keep sensitive payloads local
This formatter works client-side, which makes it convenient for internal configuration snippets or debug responses.
Common examples
Pretty JSON for inspection
{"name":"DartShell","offline":true} -> {
"name": "DartShell",
"offline": true
}Minified JSON for transport
{
"name": "DartShell"
} -> {"name":"DartShell"}