Expert guidance for implementing the GTM data layer including structure, events, e-commerce tracking, SPA patterns, and best practices. Use when designing data layer architecture, implementing tracking events, setting up e-commerce data, debugging data layer issues, migrating to GA4 data layer patterns, working with dataLayer.push syntax, implementing data layers in React, Vue, Angular, or Next.js applications, or working with .js, .jsx, or .tsx files containing ecommerce objects.
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references/datalayer-best-practices.mdreferences/datalayer-fundamentals.mdreferences/ecommerce-datalayer.mdreferences/spa-datalayer.md