Set the endpoint to Mailgun's Postbin. A Postbin is a web service that allows you to post data, which is then displayed through a browser. This allows you to quickly determine what is actually being transmitted to Mailgun's API.

PostBin, a simple web service for testing and logging of the receival of WebHooks (HTTP POST requests).

a constellation already described in 1805 by Heinrich von Kleist in his fascinat-ing analysis of the “Midwifery of Thought”: “If you want to know something and cannotfind it through meditation, I advise you, my dear, clever friend, to speak about it withthe next acquaintance who bumps into you.” 43 The positive tension that such a conversa-tion immediately elicits through the expectations of the Other obliges one to producenew thought in the conversation. The idea develops during speech. There, the sheeravailability of such a counterpart, who must do nothing further (i.e., offer additionalstimulus through keen contradiction of the speaker) is already enough; “There is a specialsource of excitement, for him who speaks, in the human face across from him; and agaze which already announces a half-expressed thought to be understood often givesexpression to the entire other half.”44

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In his “On the gradual fabrication of thoughts while speaking,” Kleist was in turn musing on Immanuel Kant’s metaphor of the teacher as the midwife at the birth of the student’s thought. When stuck in developing a thought, Kleist recommends, find an acquaintance to talk at. No responses are required. The mere presence of the silent interlocutor, and even more so the imminent threat of losing their attention during lengthy stretches of boredom or incoherence will trigger, or so Kleist claims, the “fabrication of my idea in reason’s workshop.”

Having an understanding of higher level abstractions, such as tasks, activities and the historical code path taken, its debugging trace is much closer to how you, as an engineer, think about your code.

This is my absolute favorite feature ever and the official reason for (re-)writing Trailblazer 2.1. It makes me happy every time I use it.

You’re allowed to blame us for a terrible developer experience in Trailblazer 2.0. It’s been quite painful to find out which step caused an exception. However, don’t look back in anger! We’ve spent a lot of time on working out a beautiful way for both tracing and debugging Trailblazer activities in 2.1.

There's a bash debugger, bashdb, which is an installable package on many distros. It uses bash's built-in extended debugging mode (shopt -s extdebug).

LogRocket is a frontend application monitoring solution that lets you replay problems as if they happened in your own browser. Instead of guessing why errors happen, or asking users for screenshots and log dumps, LogRocket lets you replay the session to quickly understand what went wrong. It works perfectly with any app, regardless of framework, and has plugins to log additional context from Redux, Vuex, and @ngrx/store. In addition to logging Redux actions and state, LogRocket records console logs, JavaScript errors, stacktraces, network requests/responses with headers + bodies, browser metadata, and custom logs. It also instruments the DOM to record the HTML and CSS on the page, recreating pixel-perfect videos of even the most complex single-page apps.