I at least need this much to start.

json.go

@@ -0,0 +1,37 @@
+package i2pcontrol
+
+type jsonStructure struct {
+    echo string
+}
+
+func (j *jsonStructure) Id() string {
+    rstring := randomString(10)
+    return rstring
+}
+
+func (j *jsonStructure) Format(m string, s []string) string {
+    rstring := "{\n"
+    rstring += "method: \"" + m +"\"\n"
+    rstring += "jsonrpc: \"2.0\"\n"
+    rstring += "id: \"" + j.Id() + "\"\n"
+    rstring += "params: \""
+    for _, value := range s {
+        rstring += value + " "
+    }
+    rstring += "\"\n"
+    rstring += "}\n"
+    return rstring
+}
+
+func (j *jsonStructure) Echo(s ...string) string{
+    return j.Format("echo", s)
+}
+
+func (j *jsonStructure) jsonStructure() jsonStructure {
+    return *j
+}
+
+func newJsonStructure() *jsonStructure {
+    var j jsonStructure
+    return &j
+}