initial

go.mod

@@ -0,0 +1,3 @@
+module csv-to-json
+
+go 1.22.1

main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"encoding/csv"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+	parser := csv.NewReader(os.Stdin)
+	fields, err := parser.Read()
+	if err != nil {
+		panic(err)
+	}
+	n := 0
+	for {
+		n += 1
+		line, err := parser.Read()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			panic(err)
+		}
+		if len(line) != len(fields) {
+			log.Println("[WARN]", "line", n, "has", len(line), "fields but only", len(fields), "are known")
+		}
+		lineResult := map[string]string{}
+		for i := range line {
+			k := strconv.Itoa(i)
+			if i < len(fields) {
+				k = fields[i]
+			}
+			lineResult[k] = line[i]
+		}
+		b, _ := json.Marshal(lineResult)
+		fmt.Printf("%s\n", b)
+	}
+}