Mutode

Spec sheet

What it does

Mutode generates small code changes called mutants and runs tests to reveal whether the tests detect them.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Purpose

Mutode performs mutation testing for Node.js and JavaScript.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Intended users

Mutode is a mutation testing tool for JavaScript and Node.js projects.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Integrations

The documentation describes npm installation and execution but does not list third-party service integrations.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

License

The page identifies the license as MIT and names Diego Rodríguez Baquero in its copyright notice.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Concurrency

The concurrency option controls mutant runners and defaults to 4.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Configuration

Users can select mutation operators and set concurrency; the command-line documentation gives a default concurrency of 4.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

How it works

It makes small code changes called mutants and runs the test suite; failing tests kill a mutant, while passing tests mean it survived.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Install

The page documents global npm installation, local development dependency installation, npx usage, and package.json scripts.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Installation

The page documents installing Mutode globally with npm or locally as a development dependency.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Logs

Mutode saves logs in a .mutode folder in the project.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Mutation operators

Documented operators include changing literals and conditionals, altering math operators, and removing code elements such as array elements, function arguments, lines, and switch cases.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Operator selection

Users can select mutation operators with the --mutators option.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Parallel execution

Mutode creates project copies for concurrent mutant runners and supports configuring the number of runners.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Results

Mutode reports killed, survived, and discarded mutants and calculates mutant coverage.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Runtime requirement

Mutode requires Node 8 or later.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Security and compliance

The opened product pages do not state security certifications or compliance claims.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Test requirement

Mutode runs the project’s npm test command before proceeding and reports an error if the clean test suite exits with a nonzero code.Read 4 Oct 2026 · thesoftwaredesignlab.github.io

Ways to run

The page documents running Mutode directly, with npx, or through a package.json script.Read 9 Oct 2026 · thesoftwaredesignlab.github.io

Where Specifiction places it

• Mutation Testing Tools#23 of 256.7