Apollo Server
Apollo Server is an open-source, spec-compliant GraphQL server that works with any GraphQL schema built with GraphQL.js or other compatible libraries. It enables developers to build production-ready GraphQL APIs quickly by handling tasks like query parsing, validation, and execution, while integrating seamlessly with various data sources and backend services. It supports features like caching, error handling, and real-time subscriptions out of the box.
Developers should learn Apollo Server when building GraphQL APIs for web or mobile applications, as it simplifies server-side implementation with built-in best practices and tooling. It is particularly useful in scenarios requiring flexible data fetching, such as aggregating data from multiple microservices or databases, or when real-time updates via subscriptions are needed. Its integration with the broader Apollo ecosystem (e.g., Apollo Client) also makes it ideal for full-stack JavaScript/TypeScript projects.