expect is a core assertion library widely used in JavaScript testing frameworks like Jest. It provides a rich set of matchers for verifying values, objects, and conditions in your tests. With expect, you can easily assert equality, check data types, verify function calls, and much more, making your test suites more expressive and robust. Its simple and readable syntax enhances code clarity and maintainability.
The expect npm package has had a fluctuating release frequency since 2011. Initial releases were sparse, with periods of inactivity. Releases became more consistent between 2014 and 2022, with multiple versions per month at times. Frequency decreased after 2022, with no releases between October 2023 and May 2025. There were 6 version releases between June 2025 and July 2025.
Expect's npm package downloads show a fluctuating trend. From February 2024 to July 2025, downloads generally increased, peaking in June and July 2025 around 200 million. August 2025 shows a significant dip to 127 million, but this is likely incomplete data for the month. Overall, expect remains a popular package with high download numbers.
