Quick Answer: The best way to use JSON-LD for local business, service, and FAQ schema together is to implement them as separate, valid schema blocks on the same page and connect them with shared entities using consistent @id references. This lets search engines understand your business entity, your service offerings, and your question-answer content without confusing page intent or creating duplicate markup.
Use JSON-LD in a layered structure: define the local business as the primary entity with name, address, phone, geo, opening hours, and sameAs; add Service schema to describe each service area or offering with clear serviceType, provider, and areaServed; and place FAQPage schema only where the page actually contains visible FAQ content. For best results, keep one canonical business entity across the site, reuse the same @id in all related schemas, and make sure every property matches the on-page content exactly. This approach improves entity recognition, supports local pack relevance, and gives Google clean, disambiguated signals about who you are, what you do, and what questions you answer.