Backend – useragent.one

This is the Fastify + TypeScript backend for useragent.one. It exposes a simple HTTP API powered by the excellent user-agents package.

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🧠 What It Does

• Serves random user-agent strings via a GET endpoint
• Accepts query params to filter results (device type, platform, etc.)
• Fetches a fresh user-agent list daily using node-cron
• Built for speed, lightweight, and deployed with Docker

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⚙️ Tech Stack

• Framework: Fastify
• Language: TypeScript
• Validation: Zod
• Scheduler: node-cron
• User-Agent source: user-agents

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🔄 Fresh User-Agents

The user-agents package maintains an up-to-date list of real browser user-agent strings, updated daily. This backend uses node-cron to pull a fresh copy of the list every 24 hours, so you always get the latest without redeploying or reinstalling.