The article explores the limitations of TypeScript in preventing runtime errors, particularly highlighting that static type checking does not guarantee the absence of all potential errors, such as those arising from unexpected external data structures. It presents manual validation and the use of validation libraries like ajv as methods to address these issues, discussing their advantages and disadvantages. A novel approach, dynamic type validation, is introduced, which combines TypeScript types with JSON schema validation to ensure that types and validators remain synchronized. This method involves generating validators directly from TypeScript type definitions using a tool like typescript-json-validator, thereby improving consistency between the codebase and schema while maintaining error-checking capabilities. The article ultimately suggests that while TypeScript offers many benefits, developers should implement dynamic validations for any external data sources to ensure robustness and reliability in their applications.