Ajv is a highly performant JSON Schema validator written in JavaScript. It supports JSON Schema drafts 04, 06, 07, 2019-09 and 2020-12, offering comprehensive validation capabilities. Ajv prioritizes speed and efficiency, making it suitable for applications requiring robust and rapid schema validation. It includes features like custom keywords, formats, and error messages, enabling tailored validation solutions. Ajv boasts broad adoption within the JavaScript ecosystem, indicating its reliability and practicality.
The npm package ajv experienced its most active release period in 2015 and 2016, with a high frequency of new versions. The release rate significantly slowed down after 2017, with many months seeing no releases. From 2022 onwards, releases became very sporadic, and in 2025, up to August, there have been no new versions published.
Ajv npm package downloads show a generally increasing trend from March 2024 to July 2025, peaking at over 702 million in June 2025. August 2025 downloads are lower, but are incomplete. Downloads consistently exceeded 400 million monthly, demonstrating strong and sustained usage.
