diff --git a/main.go b/main.go
index debe7ac..8f99f9e 100644
--- a/main.go
+++ b/main.go
@@ -1,8 +1,10 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
+	"os"
 
 	"github.com/wistefan/did-helper/did"
 	"go.uber.org/zap"
@@ -15,13 +17,15 @@ func init() {
 func main() {
 	var path string
 	var password string
+	var outputFile string
 
 	flag.StringVar(&path, "keystorePath", "", "Path to the keystore to be read.")
 	flag.StringVar(&password, "keystorePassword", "", "Password for the keystore.")
+	flag.StringVar(&outputFile, "outputFile", "", "File to write the did.json. Will not write the file if empty.")
 
 	flag.Parse()
 
-	zap.L().Sugar().Infof("Path to the keystore: %s", path, "Password to be used: %s", password)
+	zap.L().Sugar().Infof("Path to the keystore: %s", path, "Password to be used: %s", password, "Output file: %s", outputFile)
 
 	did, err := did.GetDIDKeyFromECPKCS12(path, password)
 
@@ -30,4 +34,21 @@ func main() {
 	} else {
 		fmt.Println("Did key is: ", did)
 	}
+
+	if outputFile != "" {
+		didJson := Did{Context: []string{"https://www.w3.org/ns/did/v1"}, Id: did}
+		jsonFileContent, err := json.Marshal(didJson)
+		if err != nil {
+			zap.L().Sugar().Warnf("Was not able to marshal the did-json. Err: %s", err)
+		}
+		err = os.WriteFile(outputFile, jsonFileContent, 0644)
+		if err != nil {
+			zap.L().Sugar().Warnf("Was not able to write the did-json to %s. Err: %s", outputFile, err)
+		}
+	}
+}
+
+type Did struct {
+	Context []string `json:"issuerDid,omitempty"`
+	Id      string   `json:"id"`
 }