Text Post API

After this module you can turn any n8n workflow into an HTTP API endpoint that validates input and returns proper status codes.

What it does

A tweet-style "create post" API. You POST a JSON body with a text (and an optional author) to /webhook/posts. If the text is 1–280 characters, the workflow replies 201 Created with the new post: an id, the author, the text, its length and a timestamp. If the text is missing, empty or too long, it replies 400 with an error message.

Flow

Webhook (POST /posts) → Valid Post? ─true─→ Build Post  → Respond Created (201)
                                    └false─→ Build Error → Respond Error (400)

Files

File	Tier	Purpose
lesson.md	Free	Step-by-step build
workflow/starter.json	Free	Linear version without validation (exercise start)
express-vs-n8n.md	Free	The same API in Express, compared line by line, with pros and cons
workflow/learner.json	Learner	Finished workflow with validation, 201 and 400
exercises.md	Learner	Practice tasks
solutions.md	Learner	Exercise solutions
assets/express-text-post/	Private	Same API in Express, for the Express vs n8n video
assets/video/	Private	Remotion source for the animated 60s short
notes.md	Private	My learning log
sell/	Private	Offer, video script, blog post