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Formate, embeleze e minifique JSON com mensagens de erro claras e com indicação de linha.
A JSON formatter rewrites compact or messy JSON with consistent indentation so nested objects and arrays are easy to read. It is the quickest way to inspect an API response, a config file, or a saved payload before you edit it by hand.
Formatting runs entirely in your browser. The text you paste is parsed and printed locally, never sent to a server, so it is safe to use with internal data, tokens, or anything else you would rather not share.
Pretty-print a compact API response
Entrada
{"user":{"id":7,"name":"Ada","roles":["admin","editor"]}}Saída
{
"user": {
"id": 7,
"name": "Ada",
"roles": [
"admin",
"editor"
]
}
}Same data, but the structure is now visible at a glance.
Minify JSON before sending it
Entrada
{
"ok": true,
"items": 3,
"message": "ready"
}Saída
{"ok":true,"items":3,"message":"ready"}Minifying strips whitespace, which shrinks request bodies and config files.
No. The document is parsed and printed in your browser with the built-in JSON parser, so nothing you paste leaves your device.
JSON is strict: trailing commas, single quotes, unquoted keys, and comments are all invalid. The tool points to the line and column so you can fix the exact spot.
It reports where parsing fails but it will not silently change your data. You fix the source, then format again.
Everyday files up to a few megabytes are instant. Very large documents may take a moment to parse and format.
Yes. It is completely free, runs in your browser, and needs no account, no upload and no installation.
Yes. It is a normal web page, so it works in any modern mobile browser and the layout adapts to small screens.
Pretty-print adds indentation and line breaks so JSON is readable. Minify removes all optional whitespace to make the payload as small as possible for sending or storing.
Paste or type JSON — it's checked as you type.