Why 3D product configurators must calculate prices server-side, not client-side

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Client-side price calculation in Three.js product configurators is a critical security flaw, as any user can manipulate the price variable via browser DevTools and submit fraudulent orders. The correct approach separates responsibilities: the frontend displays only a clearly labeled price estimate for a smooth user experience, while the backend independently recalculates the authoritative price at order submission. A recommended 'Confirm order' step fetches the real server-side price before final checkout, eliminating any discrepancy between the preview and the actual charge. The same principle extends to configuration validation, where shared JSON Schema rules provide real-time frontend feedback but the backend serves as the final enforcement gate. This pattern is already used by platforms like Shopify custom apps, Bagisto, and Zakeke to prevent pricing manipulation.

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