Have your APIs gained a bit of weight? Do they consume more than necessary? Don’t worry, we’re bringing out the toolbox to give them a Green relooking!

In this presentation, we will apply, step by step, the “API Green Score” framework on a real and existing API, using open source tools and concrete metrics.

The observation is simple: modern APIs are often resource-hungry.

The problem? Not a lack of principles, but the absence of measurable, automatable, and automated rules.

In a live code demo, we will:

• Take measurements (payload, latency, and cache).
• Calculate the Green Score, energy consumption, and carbon emissions per endpoint, with aggregation and a reporting dashboard.
• Implement actionable rules: GZIP/Brotli compression, partial fields, reducing transferred data, mandatory pagination, and more.
• Automate recalculation and non-regression with continuous integration (CI) pipelines (GitHub Actions, Creedengo, SonarQube, and Spectral).

Result? A lighter, faster API, with a reduced environmental impact, and above all, more proactive by monitoring on push and PR.

We will show you the gains live (before and after): reduced network traffic, stabilized latency, and optimized cache.

And to leave with something concrete, a GitHub repo awaits you with everything needed to reproduce the automated process.

Example of dashboard: https://thiernodialloafa.github.io/green-api-workshop-final/