Golang CSV Writer Example for a Web Application - Warning No error handling, just the basic concept.

CSVwriterExample

import (
	"../../web"
	"bytes"
	"encoding/csv"
}

func GenerateCSV(ctx *web.Context, args ...string) {

	record := []string{"test1", "test2", "test3"} // just some test data to use for the wr.Writer() method below.

	b := &bytes.Buffer{} // creates IO Writer
	wr := csv.NewWriter(b) // creates a csv writer that uses the io buffer.
	for i := 0; i < 100; i++ { // make a loop for 100 rows just for testing purposes
		wr.Write(record) // converts array of string to comma seperated values for 1 row.
	}
	wr.Flush() // writes the csv writer data to  the buffered data io writer(b(bytes.buffer))

	ctx.ResponseWriter.Header().Set("Content-Type", "text/csv") // setting the content type header to text/csv

	ctx.ResponseWriter.Header().Set("Content-Type", "text/csv")
	ctx.ResponseWriter.Header().Set("Content-Disposition", "attachment;filename=TheCSVFileName.csv")
	ctx.ResponseWriter.Write(b.Bytes())

}

Very Helpful article. Just to point out, ctx.ResponseWriter.Header().Set("Content-Type", "text/csv") , this has been repeated twice.