# What changed in mixpanel

> 11 changes in mixpanel 0.19 to 0.24 from its official release notes, upgrade guides and advisories: 6 new APIs and options. Each one cited. Sources checked 2026-10-26. HTML: https://unstale.sh/npm/mixpanel/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## mixpanel 0.24

### New APIs and options

- Date custom ops are implemented for flags runtime props. (0.24.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0240-2026-09-01)
- Semver custom ops are implemented for flags runtime props. (0.24.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0240-2026-09-01)

## mixpanel 0.23

### New APIs and options

- Adds support for service accounts. (0.23.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0230-2026-07-29)

### Fixes and other changes

- The backend error message is forwarded. (0.23.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0230-2026-07-29)
- Fallback reasons are distinguished. (0.23.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0230-2026-07-29)
- Concurrent polling start callers no longer leak intervals. (0.23.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#v0230-2026-07-29)

## mixpanel 0.22

### New APIs and options

- A new OpenFeature server provider package is available for developers integrating Mixpanel with OpenFeature. (0.22.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#0220--2026-05-04)

### Tooling

- The repository is split into packages, including a package named mixpanel. (0.22.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#0220--2026-05-04)

## mixpanel 0.20

### New APIs and options

- Adds support for advanced Feature Flag local-evaluation runtime rules. (0.20.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#0200--2026-01-12)

## mixpanel 0.19

### New APIs and options

- Adds initial support for Feature Flags. (0.19.0) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#0190--2025-11-12)

### Fixes and other changes

- Fixes a .d.ts issue introduced in v0.19.0. (0.19.1) — [release notes](https://github.com/mixpanel/mixpanel-node/blob/a33c6bca7b49bcfccc47ec706f70bb05aa598b8c/packages/mixpanel/CHANGELOG.md#0191--2025-11-13)