next-compute-first-load

A tiny node.js script to recompute Next.js first load build metric, in KB (tested with Next.js 9.3.3)

Why

Next.js first load metric can be seen when building your Next.js app. It's a powerful analytics, that can be used to track your app performances. Unfortunatly, Next does not offer a way to get this data yet, and parsing the build output seems like a bad idea.

I implemented this small script to compute this metric myself.

How to use

• Copy next-compute-first-load.js to your project root

• Give him correct rights

  chmod u+x next-compute-first-load.js

• Build your Next.js app

next build

• Launch script and compare results (stored within new file ./first-load-stats.json)

./next-compute-first-load.js
cat ./first-load-stats.json

Output example

Values are in KB

{
  "/Account": 24,
  "/Homepage": 512,
  "/Product": 113,
  "/Search": 234,
  "/_app": 113,
  "/_error": 134
}