diff --git a/src/library.go b/src/library.go
index 33c8b554a..0ff8e2d9d 100644
--- a/src/library.go
+++ b/src/library.go
@@ -7,35 +7,44 @@ import (
 )
 
 //export doCreateAccount
-func doCreateAccount(password, keydir *C.char) (*C.char, *C.char, C.int) {
+func doCreateAccount(password, keydir *C.char) *C.char {
 	// This is equivalent to creating an account from the command line,
 	// just modified to handle the function arg passing
 	address, pubKey, err := createAccount(C.GoString(password), C.GoString(keydir))
+	out := fmt.Sprintf(`{
+		"address": %s,
+		"pubkey": %s,
+		"error": %s
+	}`, address, pubKey, err.Error())
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
-		return C.CString(""), C.CString(""), -1
+		return C.CString(out)
 	}
-	return C.CString(address), C.CString(pubKey), 0
+	return C.CString(out)
 }
 
 //export doUnlockAccount
-func doUnlockAccount(address, password *C.char) C.int {
+func doUnlockAccount(address, password *C.char) *C.char {
 	// This is equivalent to unlocking an account from the command line,
 	// just modified to unlock the account for the currently running geth node
 	// based on the provided arguments
-	if err := unlockAccount(C.GoString(address), C.GoString(password)); err != nil {
+	err := unlockAccount(C.GoString(address), C.GoString(password))
+	out := fmt.Sprintf("{\"error\": %s}", err.Error())
+	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
-		return -1
+		return C.CString(out)
 	}
-	return 0
+	return C.CString(out)
 }
 
-// export doStartNode
-func doStartNode(datadir *C.char) C.int {
+//export doStartNode
+func doStartNode(datadir *C.char) *C.char {
 	// This starts a geth node with the given datadir
-	if err := createAndStartNode(C.GoString(datadir)); err != nil {
+	err := createAndStartNode(C.GoString(datadir))
+	out := fmt.Sprintf("{\"error\": %s}", err.Error())
+	if err != nil {
 		fmt.Fprintln(os.Stderr, err)
-		return -1
+		return C.CString(out)
 	}
-	return 0
+	return C.CString(out)
 }