Why it matters
Compares JSON-LD between two versions of a page to catch rich-result properties lost in a redesign or deploy.
Extract JSON-LD from both inputs (paste or optional fetch), flatten by @id/@type path, structural diff via json-diff-patch's engine, and flag losses against structured-data-validator's required-property rules. Output a release-check report. Everything runs in your browser; nothing you paste is sent unless you press Fetch.
How to use it
- Paste your input, or press Fetch to read a live URL you give.
- Read the results and the notes.
- Copy or download the output you need.
- If you used Fetch, check a sample on the live site too.
FAQ
Is my URL or page stored?
No. Fetch reads the address you give once, as LeejTools/1.0, and leej.uk keeps only a count. Pasted text never leaves your device.
Will this change my site for me?
No. It shows results and, where it writes rules or files, you copy them and apply them yourself.
Can I rely on this as official guidance?
It follows public documentation and well-known algorithms, and tells you where it is a subset or a simulation. Confirm critical changes in the official tool or a staging environment.
