{ } JSON Formatter & Validator
Paste JSON to beautify, minify, and validate it online — instantly, entirely in your browser, with nothing sent to a server.
Input JSON
Paste or edit JSON above, then choose an action.
Output
How This JSON Formatter Works
This free online JSON tool parses your input with the browser's built-in JSON parser, then re-serializes it either "beautified" (indented, human-readable) or "minified" (whitespace removed, compact for production use). If the JSON is invalid, it shows exactly what's wrong so you can fix it.
What This Tool Does
- Beautify — reformats compact or minified JSON with 2-space indentation for readability.
- Minify — strips all unnecessary whitespace to produce the smallest valid JSON for production/API use.
- Validate Only — checks whether the JSON is syntactically valid without changing its formatting.
Privacy
All formatting and validation happens locally in your browser using JavaScript's built-in JSON parser — your JSON data is never transmitted to a server, making this safe to use even with sensitive API responses or configuration data.
Frequently Asked Questions
Is my JSON data sent to a server?
No. This JSON formatter runs entirely in your browser using JavaScript's built-in JSON.parse and JSON.stringify — nothing you paste here is ever transmitted anywhere.
What does "invalid JSON" usually mean?
Common causes include trailing commas, single quotes instead of double quotes, missing quotes around keys, or unescaped special characters inside strings. The error message shown will indicate roughly where the problem is.
What's the difference between beautify and minify?
Beautify adds indentation and line breaks for human readability during development or debugging. Minify removes all unnecessary whitespace to reduce file size — useful for production APIs or minimizing payload size.