PactumJS

Free plan API

What PactumJS is

PactumJS is a free, open-source tool for automating REST API tests across several levels of a test pyramid. It supports API, component, contract, integration, and end-to-end testing, and can run as a mock server for HTTP or HTTPS services. Tests build HTTP requests and use assertions to check server responses, and can target REST backends written in any programming language. For integration tests, dependent calls can pass data between one another and save response values for reuse. Requests can be retried until a test passes or a specified condition is met; the default is one retry with a 1,000-millisecond polling interval. PactumJS is a Node.js project distributed through npm as the pactum package, with Node.js 10 and above listed as a requirement. It provides testing capabilities rather than a test runner, and is designed to work alongside Mocha, Jest, Jasmine, or Cucumber. The project uses the MIT License, and its documentation points users to GitHub Discussions for feedback and questions. The cURL-to-PactumJS converter is marked beta or experimental, with a caution that not all features may work as expected.

Who it suits

PactumJS is for developers, QA engineers, and SDETs who need API or integration testing capabilities. It is designed to accompany a test runner rather than replace one.

What it does well

Supports API, component, contract, integration, and end-to-end tests
Can run as an HTTP or HTTPS mock server
Works with REST backends built in any programming language
Free and open source under the MIT License

What to know first

Requires Node.js 10 or above
Does not provide its own test runner
The cURL converter is beta or experimental

Limits

PactumJS is free and open source. The cURL-to-PactumJS converter is experimental, and its documentation cautions that some features may not work as expected.

Plans

Plan	Billed and limits	Price
Free and open source	REST API testing tool	Free
PactumJS	Free and open source · MIT License	Free

As pactumjs.github.io lists them, read 9 Oct 2026. The maker's own page has the final word.

Getting started

Open the PactumJS website
Install the pactum package with npm install --save-dev pactum
Use Node.js 10 or newer
Add PactumJS alongside Mocha, Jest, Jasmine, or Cucumber
Write HTTP requests and response assertions
Configure mock-server or integration scenarios as needed

Verdict

PactumJS covers several API testing layers and can also serve as a mock server, while fitting into existing test-runner workflows. Its free, open-source distribution may suit teams comfortable with Node.js.

Questions

Is PactumJS free?

Yes. PactumJS is free, open source, and released under the MIT License.

Which platforms does PactumJS support?

It is a Node.js project distributed through npm as the pactum package. The quick-start requirements list Node.js 10 and above.

Does PactumJS include a test runner?

No. It is designed to work with runners such as Mocha, Jest, Jasmine, or Cucumber.

What testing types does it support?

It supports API, component, contract, integration, and end-to-end testing, plus mock-server use.

Can it test different backend languages?

Yes. Tests can target REST API servers regardless of the programming language used to build them.

Does PactumJS support GraphQL and CI/CD?

GraphQL support and CI/CD integration are listed features.

Facts from PactumJS's own pages

Audience: The site identifies developers, QA engineers, and SDETs as typical users. · pactumjs.github.io, 9 Oct 2026
Backend compatibility: Tests can target backend servers regardless of the programming language used to build their APIs. · pactumjs.github.io, 9 Oct 2026
Backend coverage: Tests can run against REST API servers regardless of the programming language used to build those servers. · pactumjs.github.io, 10 Oct 2026
Converter limitation: The cURL-to-PactumJS converter is marked beta or experimental, and the site cautions that not all features may work as expected. · pactumjs.github.io, 9 Oct 2026
Data management: The project describes its data management as an included feature for API tests and mock server use. · github.com, 10 Oct 2026
HTTP testing: Its API testing features build HTTP requests and validate server responses with assertion functions. · pactumjs.github.io, 9 Oct 2026
Install: The README gives npm install --save-dev pactum as an installation command. · github.com, 10 Oct 2026
Integration testing: The integration testing guide describes passing data between dependent API calls and saving response data for reuse in tests. · pactumjs.github.io, 9 Oct 2026
Intended users: Its typical users are developers, QA engineers, and SDETs. · pactumjs.github.io, 10 Oct 2026
License: PactumJS is released under the MIT License. · pactumjs.github.io, 10 Oct 2026
Mock server: PactumJS can act as a standalone mock server for HTTP-based APIs. · github.com, 10 Oct 2026
Purpose: PactumJS is a free and open-source REST API automation testing tool for all levels of a test pyramid. · pactumjs.github.io, 10 Oct 2026
Retry behavior: The integration testing guide says requests can be retried until a test passes or a specified condition is met, with a default maximum of one retry and a 1,000-millisecond polling interval. · pactumjs.github.io, 9 Oct 2026
Runtime and installation: PactumJS is a Node.js project distributed as the npm package pactum, and its quick-start page lists Node.js 10 and above as a system requirement. · pactumjs.github.io, 9 Oct 2026
Support: The project uses GitHub Discussions to receive feedback, discuss ideas, and answer questions. · pactumjs.github.io, 10 Oct 2026
Testing types: It supports API, component, contract, integration, and end-to-end testing, as well as a mock server. · pactumjs.github.io, 10 Oct 2026
Test runners: The project README shows using PactumJS with Mocha, Jest, or Cucumber as test runners. · github.com, 10 Oct 2026
Test style: It provides a clear, simple API for writing readable and maintainable component, contract, and end-to-end integration tests. · pactumjs.github.io, 10 Oct 2026
Use cases: It supports API, component, contract, integration, and end-to-end testing, as well as mock servers. · pactumjs.github.io, 9 Oct 2026

Where PactumJS stands on Freedom251

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