Build a Node.js Performance Tracing Tool with Async Hooks and Performance API
This article explains how to combine Node.js's experimental Async Hooks and Performance Timing APIs to create a simple tracing and performance monitoring tool, eliminating manual timing and offering a foundation that can be extended into a custom solution, while also noting an open‑source Pandora.js utility.
Trace, or link monitoring, is a mature technology in real‑time application performance monitoring that lets you visually identify slow links and target optimizations. However, applying this technique on Node.js has been somewhat cumbersome, requiring extensive handling of monitoring nodes.
Recently, newer versions of Node.js (>8.x) introduced two experimental APIs: Async Hooks and the Performance Timing API. The former injects hooks into asynchronous operations, facilitating request tracing, while the latter implements the W3C Performance Timeline specification, providing wrapped performance metrics.
By combining these two APIs we can implement a simple performance monitoring tool, freeing us from the awkwardness of manual timing before and after calls. Additional features can be built on this example to develop a personalized performance monitoring solution.
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Additionally, the team has open‑sourced a lightweight, feature‑rich Node.js application management tool called Pandora.js, built with TypeScript, which already includes Metrics and Trace capabilities using the aforementioned technologies. Interested users can check it on GitHub, give it a star, contribute PRs, or submit resumes.
GitHub: https://github.com/midwayjs/pandora
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