Generate TypeScript interfaces for this JSON. Infer union types for nullable fields and name the root interface after the likely domain concept. Output only the interfaces, no commentary: ```json ```
(Dokumentaatio englanniksi)
What it does
The JSON Formatter beautifies, minifies, and validates JSON entirely in your browser. Paste any JSON - messy, minified, or broken - and it returns cleanly indented, valid JSON, or tells you exactly what’s wrong and where. Everything runs 100% client-side: nothing you paste is ever sent to a server, so it’s safe for sensitive payloads.
How to use it
- Paste your JSON into the Input box (or hit Sample to load a demo payload).
- Choose Beautify (pretty-print, 2-space indent) or Minify (compact, no whitespace).
- Read the formatted result in Output, or the error message if the JSON is invalid.
- Copy the result, or Copy share link to send the exact input to a teammate.
Examples
Beautify minified JSON
Input: {"name":"CosmoDev","free":true,"tools":["json","base64"]}
Output:
{
"name": "CosmoDev",
"free": true,
"tools": ["json", "base64"]
}Catch a syntax error
Input: {"a": 1, "b": } → Expected property name or '}' in JSON at position 12.
Good to know
- Shareable: your input is encoded in the URL (
?j=...), so a link reproduces the exact view. - Private: all parsing happens locally - safe for secrets and credentials.
- Related tools: JSON ↔ CSV,
Base64Base64An encoding representing binary data as 64 safe ASCII characters, so it survives transport through text-only channels. It encodes — it does not encrypt.
,JWTJWTA compact, URL-safe token that carries claims (like identity or expiry) between two parties, signed to prevent tampering.Learn more
Decoder.