29 lines
1.0 KiB
Go
29 lines
1.0 KiB
Go
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package handlers
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import (
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"encoding/json"
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"net/http"
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)
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// writeJSON is a tiny shared helper used by every handler in this package
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// to avoid repeating the "set Content-Type header, write status code,
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// encode body as JSON" sequence over and over.
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//
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// data is typed `any` (Go's built-in alias for interface{}, since Go 1.18)
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// so this one function can serialize maps, structs, slices - anything
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// encoding/json knows how to handle.
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func writeJSON(w http.ResponseWriter, status int, data any) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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// Encoder writes JSON directly to the ResponseWriter (which is just an
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// io.Writer under the hood) - no need to build the JSON bytes in a
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// separate variable first.
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json.NewEncoder(w).Encode(data)
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}
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// writeError is a thin wrapper around writeJSON for the extremely common
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// case of returning a single {"error": "..."} body.
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func writeError(w http.ResponseWriter, status int, message string) {
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writeJSON(w, status, map[string]string{"error": message})
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}
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