JSON Formatter & Validator

Format, validate, and minify JSON data instantly

Enter JSON:

How to use

Paste JSON into the input.
Use Format to pretty-print, Minify to compress, or Validate to check correctness.
Copy the result with one click for configs, APIs, or docs.
Fix any reported errors and rerun to confirm validity.

Valid object

{"name":"Ada","languages":["JSON","TypeScript"],"active":true}

Common error

{"name": "Ada", trailing: comma,} → trailing comma and unquoted key will fail validation.

Minify

Format first, then Minify to remove whitespace for transport.

Why is my JSON invalid?

Check for trailing commas, missing quotes, or single quotes instead of double quotes.

Is data sent to a server?

No. Formatting, minifying, and validation run entirely in your browser.

Large payloads?

Very large inputs may slow the browser; split huge files if needed.