slownami

Log any function that runs too slow — simple performance monitoring for Node.js or browser.

Install

npm install slownami

Usage

Wrap any function call with slownami to monitor its execution time. If it runs longer than your threshold, a warning is logged.

Example

You can use slownami to monitor any function, such as database queries, API calls, or expensive computations:

import { slownami } from "slownami";

function expensiveCalculation(n: number) {
  let sum = 0;
  for (let i = 0; i < n * 1e6; i++) sum += i;
  return sum;
}

async function run() {
  await slownami(() => expensiveCalculation(100), "expensiveCalculation", 100);
}

run();

If expensiveCalculation takes longer than 100ms, you'll see a log like:

[slownami] expensiveCalculation took 350ms (threshold: 100ms)

Function Signature

slownami<T>(
  fn: () => Promise<T> | T,
  label?: string,
  thresholdMs?: number,
  logger?: (msg: string) => void
): Promise<T>

• fn: The function to execute and monitor.
• label: (optional) Name for logging. Default: "unnamed".
• thresholdMs: (optional) Time in ms before logging a warning. Default: 300.
• logger: (optional) Custom logger function. Default: console.warn.

License

MIT