Convert JSON to CSV in Golang
Need to load a data file with JSON encoded data and save it to CSV file ? This tutorial will cover just that :
The Golang code below will first read this JSON data file :
data.json
[
{"Name":"Adam","Age":36,"Job":"CEO"},
{"Name":"Eve","Age":34,"Job":"CFO"},
{"Name":"Mike","Age":38,"Job":"COO"}
]
and output to data.csv file
Adam,36,CEO
Eve,34,CFO
Mike,38,COO
json2csv.go
package main
import (
"fmt"
"io/ioutil"
"encoding/json"
"os"
"strconv"
"encoding/csv"
)
type Employee struct {
Name string
Age int
Job string
}
func main() {
// read data from file
jsondatafromfile, err := ioutil.ReadFile("./data.json")
if err != nil {
fmt.Println(err)
}
// Unmarshal JSON data
var jsondata []Employee
err = json.Unmarshal([]byte(jsondatafromfile), &jsondata)
if err != nil {
fmt.Println(err)
}
csvdatafile, err := os.Create("./data.csv")
if err != nil {
fmt.Println(err)
}
defer csvdatafile.Close()
writer := csv.NewWriter(csvdatafile)
for _, worker := range jsondata {
var record []string
record = append(record, worker.Name)
record = append(record, strconv.Itoa(worker.Age))
record = append(record, worker.Job)
writer.Write(record)
}
// remember to flush!
writer.Flush()
}
Hope this simple tutorial can be useful to you.
References :
https://www.socketloop.com/tutorials/golang-convert-type-integer-to-string
https://www.socketloop.com/references/golang-encoding-json-unmarshal-function-example
See also : Golang : Convert CSV data to JSON format and save to file
By Adam Ng
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