I'm trying to add the payload data to the breadcrumbs sent to Sentry.io. It just looks like this. I found out how to add the response. const sentryConfig: BrowserOptions = { beforeBreadcrumb: (breadcrumb, hint) => { if (breadcrumb.category === 'xhr') { // hint.xhr is a whole XHR object that you can use to modify breadcrumb breadcrumb.data = (hint.xhr as XMLHttpRequest).response; } return breadcrumb; } }; But I cannot seem to find a way to add the payload. XMLHttpRequest doesn't have this info. Continue reading...