JSON Formatter & Validator

Paste JSON to pretty-print it with two-space indentation, minify it for production, or simply check that it parses. Invalid input produces the exact parser error so you can find the problem fast.

Runs locally — nothing you enter is sent Developer Free · no signup

How to use

Paste JSON into the editor.
Click Beautify to pretty-print or Minify to strip whitespace.
If the JSON is invalid, read the parser error message to locate the issue.

Examples

Input

{"a":1,"b":[true,null]}

Beautified

{
  "a": 1,
  "b": [
    true,
    null
  ]
}

Supported formats

Strict JSON (RFC 8259). JavaScript object literals with unquoted keys or trailing commas are reported as invalid.

Privacy

This tool runs entirely in your browser. Nothing you enter or open is sent anywhere. Privacy policy.

Limitations

Comments and trailing commas are rejected because they are not valid JSON.
Numbers beyond IEEE-754 double precision lose exactness, as in any JavaScript-based formatter.

FAQ

Why is my JSON reported as invalid?

Common causes: single quotes instead of double quotes, trailing commas, unquoted keys, or comments. The error message points to the first offending position.

Is pasted JSON sent to a server?

No. Parsing and formatting use the browser's built-in JSON engine with no network calls.