Imgtools Utility LabJSON Formatter & Validator
Paste a single-line API response and get a properly indented, readable structure straight away. When the syntax is broken the error is reported so you can quickly spot the missing comma or unclosed quote. Everything is parsed locally and never sent to a server.
JSON Formatter
Key features
- One-click pretty printing keeps deeply nested structures readable
- Immediate syntax validation with clear error messages
- Local parsing means payloads and API keys stay private
How to use
- Paste the JSON text you want to format
- Press the format button
- Read the beautified output or the error message
- Copy the formatted result and carry on
FAQ
What usually causes an "invalid JSON" error?
Most often a missing or extra comma, single quotes instead of double quotes, unquoted keys, or a trailing comma at the end of an object or array.
Does formatting change my data?
No. Only whitespace and indentation change — keys, values and their order are preserved.
Is pasted data safe?
Yes. Parsing uses the browser's built-in JSON parser locally and nothing leaves your device.
Privacy First: Files are processed locally in your browser and never uploaded to our servers, keeping your data 100% private.