wav-normalizer-js — Normalize WAV Audio in Node.js (Peak & Loudness)

Normalize WAV audio files in Node.js and JavaScript.

Fix low-volume recordings, equalize loudness, and prepare audio for voice pipelines, transcription, or publishing.

Supports peak normalization and loudness analysis for PCM WAV files.

Features

• Read WAV PCM sample data
• Calculate peak level
• Normalize samples to a target peak
• Small and focused API
• Useful for backend scripts and audio workflows

Install

npm install wav-normalizer-js

Usage

import { normalizeWav } from "wav-normalizer-js";

const result = await normalizeWav("./input.wav", {
  targetPeak: 0.95,
  outputPath: "./output.wav",
});

console.log(result.beforePeak); // 0.61
console.log(result.afterPeak);  // 0.95

API

normalizeWav(inputPath: string, options?: NormalizeWavOptions)

Normalizes a WAV file to the target peak and returns normalization metadata.

getWavPeak(inputPath: string): Promise<number>

Returns the current peak amplitude of a WAV file.

Example

import { getWavPeak } from "wav-normalizer-js";

const peak = await getWavPeak("./voice.wav");

if (peak < 0.4) {
  console.log("This audio is relatively quiet");
}

Why normalize audio?

Raw audio files often have inconsistent volume levels.

• Some recordings are too quiet
• Others clip or distort
• Voice pipelines require consistent loudness

This package helps you normalize WAV files to a target peak quickly and easily.

Use Cases

• Normalize voice recordings before transcription (Whisper, etc.)
• Fix low-volume audio files automatically
• Prepare WAV files for upload or publishing
• Standardize loudness across audio datasets
• Build voice and media processing pipelines

Why wav-normalizer-js?

• No heavy audio libraries
• Simple API for peak normalization
• Fast and lightweight
• Designed for automation and scripts

Related

Building voice apps or processing audio at scale?

👉 https://www.vocallab.ai — generate voiceovers and captions instantly

License

MIT

Keywords

• normalize wav nodejs
• normalize audio javascript
• wav loudness normalize
• audio peak normalize node
• fix quiet audio node js