Use Node.js with Express, PostgreSQL, Prisma, node-cron, and the Infobip SMS API to build a robust reminder service. This setup allows you to store reminder details in a database, schedule sending times, and reliably deliver SMS messages via Infobip's platform.

Node-cron is a task scheduler in Node.js that allows you to automate tasks. In an SMS reminder service, it's used to trigger the sending of SMS messages at specified times, ensuring reminders are delivered promptly.

Storing reminder times in UTC (Coordinated Universal Time) prevents timezone issues. This ensures that reminders are sent at the correct time regardless of the user's location or server settings.

Express-rate-limit helps protect your API from abuse, such as brute-force attacks. It limits the number of requests an IP address can make within a time window, enhancing the security and stability of your application.

Yes, a free Infobip trial account can be used for testing. Keep in mind there are limitations, such as restrictions on recipient numbers. For production, a paid account is necessary for full functionality and higher message volumes.

Initialize the Infobip Node.js SDK with your API key and base URL. These credentials can be found in your Infobip account dashboard. Ensure the URL includes "https://" and error handle for missing configurations.

Set up a cron job using node-cron's schedule method. Define the desired schedule (e.g., every minute, daily, etc.) and the function to send reminders. Use UTC timezone to avoid time discrepancies.

Prisma simplifies database interactions in Node.js. It's an ORM (Object-Relational Mapper) that allows you to define your database schema and access data using JavaScript objects, making database operations more efficient and type-safe.

Create directories for config, controllers, routes, services, and utils within a src folder. This structure improves code organization, maintainability, and separation of concerns.

PostgreSQL is recommended for its reliability and efficiency. It's a powerful open-source relational database suitable for handling large volumes of reminder data and frequent queries.

You'll need Node.js, access to a PostgreSQL database, an Infobip account, basic familiarity with Node.js, Express, REST APIs, and databases, and tools like cURL or Postman for testing.

Use the libphonenumber-js library in your Node.js project. This library helps validate and format phone numbers according to international standards, ensuring that you're using correct number formats for SMS delivery.

Storing phone numbers in E.164 format (+15551234567) is recommended for consistency and compatibility. The format ensures correct number parsing and avoids issues with different regional formats.

Winston provides flexible logging for your application. It helps you track events, errors, and other relevant information, aiding in debugging and monitoring the health of your service.