In this follow-up to our full-stack tutorial, we wrap up the backend logic for creating new posts. Learn how to take incoming data from the frontend, push it to an in-memory array, and persist it by overwriting the posts.json file using Node.js’s fs module.
📂 What you'll learn:
- How to push new data to an in-memory array
- Use fs.writeFileSync() to save posts to posts.json
- Format JSON with indentation for readability
- Set proper UTF-8 encoding when writing files
- Debug why new posts might not appear in the frontend
- BONUS: Simulate and handle backend errors with .catch() in your fetch logic
💬 This tutorial is perfect for anyone building a messaging app, blog, or CRUD-based project and wants to understand how to persist data locally with Node.js.
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