[![GitHub Workflow Status (main)](https://img.shields.io/github/actions/workflow/status/microsoft/ApplicationInsights-JS/ci.yml?branch=main)](https://github.com/microsoft/ApplicationInsights-JS/tree/main)
This SDK is not for non-browser environments, for example, the Node.js applications.
For instrumenting a Node.js app, the recommended SDK is the [ApplicationInsights-node.js repository](https://github.com/microsoft/ApplicationInsights-node.js).
ES3 support has been removed from the latest version (v3.x), if required [see for ES3/IE8 Support](https://microsoft.github.io/ApplicationInsights-JS/es3_Support.html
)
## Release Versions
| Version | Details
|---------|--------------------------
| <b>[3.x](https://github.com/microsoft/ApplicationInsights-JS/tree/main)<br/><sub>(main)</sub></b>| Current supported release from April '2023.<br/>Supports dynamic configuration changes/updates after initialization. Supports all features of v2 except with the known <b>[Breaking changes from previous versions](https://microsoft.github.io/ApplicationInsights-JS/upgrade/v3_BreakingChanges.html)</b> and does NOT support the previous v1.x compatible API proxy layer, it also removes support for ES3 / IE8. Minimum supported Runtime is now ES5 (IE9+).
| [2.x](https://github.com/microsoft/ApplicationInsights-JS/tree/master)<br/><sub>(master)</sub> | Feature freeze from March '2023, security fixes and critical bugs only.<br/>Supports adding / removing extensions and full unloading/removal of the SDK after initialization. Last version to support ES3 (IE8+), also provides a v1.x compatible API proxy layer for upgrading from V1.x.
| [1.0.x](https://github.com/microsoft/ApplicationInsights-JS/tree/legacy-v1)<br/><sub>(legacy-v1)</sub> | No longer actively maintained -- please Upgrade. The documentation for `applicationinsights-js@1.0.x` has moved [here](https://github.com/microsoft/ApplicationInsights-JS/tree/master/legacy/README.md). If you are looking to upgrade to the new version of the SDK, please see the [Upgrade Guide](https://microsoft.github.io/ApplicationInsights-JS/upgrade/v2_UpgradeGuide.html). | Not actively maintained, please upgrade.