Default server error message that appears when server responed with an error but w/o message. If server returns an error, but does not return "message", the default server error message will be displayed. let form = new w2form({ name: 'form', header: 'Form Header', msgServerError: 'Unknown server error', fields: [ { field: 'first_name', type: 'text', required: true }, { field: 'last_name', type: 'text', required: true }, { field: 'email', type: 'email' } ], record: { first_name : 'John', last_name : 'Doe', email : 'jdoe@email.com' }, actions: { "save": function () { this.validate(); }, "reset": function () { this.clear(); } } });