How to Write Data to CSV in Go

In Go, you can use the standard library package encoding/csv [docs] to write data to a CSV file. Below is a example that shows you how you can write a slice of user-data related strings to a CSV file.

The code creates a new file called users.csv and writes a slice of records to it. Finally, the Flush method is used to flush any buffered data to the underlying io.Writer, which is the file.

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package main

import (
	"encoding/csv"
	"os"
	"fmt"
)

func main() {
	
	// Define the data
	records := [][]string{
		{"John", "Doe", "35"},
		{"Jane", "Doe", "29"},
		{"Jim", "Smith", "41"},
	}
	filename := "users.csv"

	// Write it to CSV
	err := WriteToCsv(records, filename)
	if err != nil {
		panic(err)
	}
	fmt.Println("Created file:", filename)
}

// WriteToCsv accepts a slice of strings to write to a csv file.
func WriteToCsv(records [][]string, filename string) error {
	file, err := os.Create(filename)
	if err != nil {
		return err
	}
	defer file.Close()

	writer := csv.NewWriter(file)
	defer writer.Flush()

	for _, record := range records {
		err := writer.Write(record)
		if err != nil {
			return err
		}
	}
	return nil
}

Running this code should output the name of the file it’s just created. In our example, we also check for errors, but we just use a panic() - you are going to want to improve on this by handling the error appropriately.

Example In Action

golang write to csv

Edd is a PHP and Go developer who enjoys blogging about his experiences, mostly about creating and coding new things he's working on and is a big beliver in open-source and Linux.

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How to Write Data to CSV in Go

Example In Action

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