Developer tool
JSON Formatter & Validator
Format, indent and validate JSON with readable errors and compact output options.
Result
Your result will appear here.
Privacy note: most tools process input locally in your browser.
About the JSON Formatter & Validator
Parses JSON, reports syntax errors, and creates either readable indented output or compact JSON. Processing happens in the browser.
How to use this tool
Paste JSON, choose indentation and output mode, then click Format / validate. Correct any reported syntax error and try again.
Example
Input: {"ok":true} becomes a readable object or compact JSON depending on your selection.
Tips for better results
JSON is strict: strings require double quotes and trailing commas are not allowed. Do not share secrets in public systems.
Frequently asked questions
Does this validate JSON?
Yes, using the browser’s JSON parser.
Does it send data to a server?
No, formatting runs locally.