JSON Tool FAQ
How do I validate JSON?
Paste JSON into the input box and click Validate. The parser checks the content directly in your browser.
Can I minify large JSON payloads?
Yes. Click Minify to remove extra whitespace and reduce payload size for transport or storage.
What does optimize/compress do?
It minifies JSON and reports how many characters were removed compared with pretty-printed output.
Does this tool send data to a server?
No. Formatting, validation, and minification are performed client-side only.
Example input/output
Input: {"user":{"name":"Ada","address":{"city":"London"}}}
Output: {"user.name":"Ada","user.address.city":"London"}
How it works
This tool recursively traverses the JSON object tree and builds a new flat object. Nested keys are joined with a dot separator to represent the original path. Arrays are indexed with their numeric position (e.g. items.0.name). Processing runs in your browser.
Common use cases
- Flatten nested JSON configuration to key-value pairs for comparison
- Transform nested API responses for import into flat CSV or database tables
- Simplify deeply nested JSON for logging or debugging