HTML / XML / JS, low-level validity (cross-cutting)HighVerified
Unescaped characters breaking JSON-LD
What it is
Bad characters invalidate structured data.
Why it matters
Markup won’t parse; no rich results.
How to fix it
Escape properly; validate.
Impact
Medium-high for rich results. Direct.
Evidence
Valid JSON-LD is required. Google Search Central, Structured data general guidelines