Go Fiber is a powerful and simple-to-use tool for building REST APIs with high performance and efficiency.Setting up a Go Fiber application is made easy with its clean, Express-inspired API and fast Fasthttp foundation.Crafting routes and handlers in Fiber is efficient due to its radix tree algorithm for fast route matching.Implementing validation, error handling, and JSON responses in Fiber ensures bulletproof APIs.Fiber's middleware aids in request validation, maintaining consistent responses throughout the API.Global error handling in Fiber centralizes error responses for better API maintenance.Fiber's support for WebSocket, HTTP/2, and Server-Sent Events adds versatility to real-time applications.Fiber promotes consistency in JSON responses through a standardized response structure.Go Fiber balances performance and developer experience, making it a preferred framework for building robust REST APIs.Migrating an existing REST API to Fiber and benchmarking the performance can showcase significant improvements.