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3.1.7 • Public • Published

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Qualscan = Quality Scanner

Qualscan analizes any type of project built on Javascript (NPM module, backend app, frontend app, etc).

Qualscan example

PurposeInstallationUsageUsing config fileReportersAPIBudgetCI / CDTestLicense


A CLI tool to run multiple plugins in order to check the quality of your Javascript project.
List of features:

  • security audit of your dependencies
  • check dependencies updates
  • check code duplications
  • check project's size (bundle's size, number of files)
  • check project's structure (readme, license, etc)
  • check exact version of dependencies
  • check dependencies (missing or unused)
  • check dependencies size (number of dep, actual size, tree's depth)
  • require time of entrypoint (loading time when we require your project)

In addition you can run all you custom scripts.
It will give you a global score based on the number of successful tasks.


This tool will basically returns 1 if, at least, one task has failed, otherwise it returns 0.

Basic error output: Qualscan error

A task is considered as successful if the fail threhsold (see budgets) has not been exceeded. warn of info thresholds will bring you more information but the task will be considered as successful even if the thresholds are exceeded.


$ npm install qualscan -g


$ qualscan


Display all existing options

$ qualscan -h

Run only a set of tasks

$ qualscan --tasks security-audit updates

Run only a set of scripts

$ qualscan --scripts test

Display tasks messages

$ qualscan -v

Display tasks messages by level

$ qualscan -v -l warn
Level Description
all (default) display all logs
error Display errors only
warn Display warnings & errors
info Display info & errors & warnings

Send custom args to jscpd

$ qualscan -cda "--ignore tests/resources/code_duplication_failed/*"

For a full list of possible arguments, please follow this documentation: Jscpd doc.

Check exact version for dev dependencies

$ qualscan -devd

Export current configuration

$ qualscan exportConf

Using Config file

Qualscan can use a configuration file instead of a list of options.

You can specify your configuration file in two different ways:

  1. Use .qualscanrc file
    By default, Qualscan will check if .qualscanrc file is present in the current directory. You can find an example here.
    "scripts": ["linter"],
    "tasks": [
    "code-duplication": {
        "args": "--ignore */resources/code_duplication_failed/* --gitignore"
    "verbose": true,
    "level": "error"
  1. Use the option -c
$ qualscan -c /pathTo/MyConfigFile.json


By default qualscan will use text reporter and display results in the console.
Allowed reporters:

  • text
  • json
  • json in console
qualscan --reporters json

By default the default path to store the report is: [workingDir]/report/qualscan_report.json

Define another report directory

qualscan --reporters json --reportPath "myCustomDir/"

To display json in console

qualscan --reporters json --reportPath ""


const qualscan = require('qualscan')
const report = await qualscan.run({
  tasks: ['code-duplication', 'project-size'],
  scripts: ['linter'],
  reporters: ['json'],
  reportPath: '' // return the report as JSON object
}, 'path/to/my/project')


The notion of budget comes from the Webperf budget principle.
With this powerful tool you can define your own thresholds for each plugin.
The principle is the following:

  • for each plugin, define your thresholds: fail, warn or info
  • for each threshold set a value for every metrics

Example in config file (for project's size plugin):

  "project-size": {
    "budget": {
      "fail": {
        "entryCount": 150,
        "size": 3000000,
        "unpackedSize": 60000000
      "warn": {
        "entryCount": 100,
        "size": 300000,
        "unpackedSize": 6000000

Basic budgets output: Budgets example

For a task:

  • successful: if fail threshold has not been exceeded
  • otherwise the task has failed

For a threshold:

  • successful if all metrics are under their maximum value
  • otherwise it has failed

So a task can lead to an error, a warning or an information.
Thresholds can only be passed or failed.

Budgets errors example

List of all metrics per plugin

Plugin Key Metric Unit
Code duplication code-duplication percentageTokens percentage of duplicated tokens
percentage percentage of duplicated lines
Exact version dependencies-exact-version dependencies number of range version in dependencies
devDependencies number of range version in dev dependencies
Security audit security-audit critical number of critical vulnerabilities
high number of high vulnerabilities
moderate number of moderate vulnerabilities
low number of low vulnerabilities
info number of info
Project's size project-size entryCount number of files
size size in bytes (only files in final bundle)
unpackedSize unpacked size in bytes (only files in final bundle)
Dependencies updates updates major number of major updates
minor number of minor updates
patch number of patch
Check dependencies dependencies-check missing number of missing dependencies
dependencies number of unused dependencies
devDependencies number of unused dev dependencies
Dependencies size dependencies-size dependencies number of all dependencies
directDependencies number of direct dependencies
weight total weight of node_modules folder (production)
depth maximum dependencies tree's depth (production)
Require time require-time entrypointTime loading time of the entrypoint : require('myModule')


Qualscan can be easily integrated with any CI pipeline.
You can look at this basic example with github actions.

To see a typical output you can have a look at this page: actions page, and click on step "run the qualscan tool".

Basic CI output with Github actions: CI example


Version Supported Tested
20.x yes yes
18.x yes yes
16.x yes yes


$ npm test

Run with coverage

$ npm run coverage

Coverage report can be found in coverage/.



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