How do I build a REST API with Chi in Go?

Building a REST API in Go using the Chi router is a straightforward and efficient process. Chi is a lightweight and fast HTTP router for building Go HTTP services, making it an excellent choice for creating RESTful APIs. In this example, we'll walk through creating a simple CRUD API.

Go, Chi, REST API, HTTP Router, CRUD, Go web development

This guide provides an overview of how to build a REST API in Go using the Chi framework, focusing on creating, reading, updating, and deleting resources in an efficient manner.


        package main
        
        import (
            "net/http"
            "github.com/go-chi/chi/v5"
            "encoding/json"
        )
        
        type Item struct {
            ID    string `json:"id"`
            Name  string `json:"name"`
        }
        
        var items = []Item{
            {ID: "1", Name: "Item One"},
            {ID: "2", Name: "Item Two"},
        }
        
        func main() {
            r := chi.NewRouter()
            
            r.Get("/items", func(w http.ResponseWriter, r *http.Request) {
                w.Header().Set("Content-Type", "application/json")
                json.NewEncoder(w).Encode(items)
            })
            
            r.Get("/items/{id}", func(w http.ResponseWriter, r *http.Request) {
                id := chi.URLParam(r, "id")
                for _, item := range items {
                    if item.ID == id {
                        w.Header().Set("Content-Type", "application/json")
                        json.NewEncoder(w).Encode(item)
                        return
                    }
                }
                http.NotFound(w, r)
            })
            
            r.Post("/items", func(w http.ResponseWriter, r *http.Request) {
                var newItem Item
                json.NewDecoder(r.Body).Decode(&newItem)
                items = append(items, newItem)
                w.WriteHeader(http.StatusCreated)
                json.NewEncoder(w).Encode(newItem)
            })
            
            r.Put("/items/{id}", func(w http.ResponseWriter, r *http.Request) {
                id := chi.URLParam(r, "id")
                var updatedItem Item
                json.NewDecoder(r.Body).Decode(&updatedItem)
                for i, item := range items {
                    if item.ID == id {
                        items[i] = updatedItem
                        updatedItem.ID = id
                        w.Header().Set("Content-Type", "application/json")
                        json.NewEncoder(w).Encode(updatedItem)
                        return
                    }
                }
                http.NotFound(w, r)
            })
            
            r.Delete("/items/{id}", func(w http.ResponseWriter, r *http.Request) {
                id := chi.URLParam(r, "id")
                for i, item := range items {
                    if item.ID == id {
                        items = append(items[:i], items[i+1:]...)
                        w.WriteHeader(http.StatusNoContent)
                        return
                    }
                }
                http.NotFound(w, r)
            })
            
            http.ListenAndServe(":8080", r)
        }

Go Chi REST API HTTP Router CRUD Go web development

How do I build a REST API with Chi in Go?

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How do I build a REST API with Chi in Go?

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