GraphQL.js
GraphQL.js is the official JavaScript reference implementation of GraphQL, a query language and runtime for APIs developed by Facebook. It provides a set of tools for building GraphQL schemas, executing queries, and handling data fetching in Node.js environments. This library enables developers to define a strongly-typed schema and resolve queries efficiently against their data sources.
Developers should learn GraphQL.js when building APIs that require flexible data retrieval, such as in modern web or mobile applications where clients need to request specific data fields to avoid over-fetching. It is particularly useful in microservices architectures or when integrating multiple data sources, as it allows for a single endpoint to serve complex queries. Use cases include e-commerce platforms, content management systems, and real-time applications where performance and data efficiency are critical.