# GrowthBook Constants API

**Canonical:** https://apis.io/apis/growthbook/growthbook-constants-api/  
**Provider:** GrowthBook — https://apis.io/providers/growthbook/  
**Base URL:** https://api.growthbook.io/api  
**Documentation:** https://docs.growthbook.io/api

GrowthBook Constants API is one of 51 APIs that [GrowthBook](https://apis.io/providers/growthbook/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Constants. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

**Beta** — these endpoints are new and may change in backwards-incompatible ways. Reusable named values referenced from feature flag values as `@const:key` and resolved into the SDK payload at build time. String constants are interpolated via `{{ @const:key }}`; JSON (object) constants are composed via an `$extends` array. A constant's own keys **replace** what its `$extends` bases provide, wholesale — constants are atomic building blocks. (Config and feature values compose as deep, targeted patches instead.)

## Operations (8)

| Method | Path | Summary |
|---|---|---|
| GET | `/v1/constants` | Get all constants |
| POST | `/v1/constants` | Create a single constant |
| GET | `/v1/constants/{key}/references` | Get features and constants that reference this constant |
| GET | `/v1/constants/{key}` | Get a single constant |
| POST | `/v1/constants/{key}` | Partially update a single constant |
| DELETE | `/v1/constants/{key}` | Delete a single constant |
| POST | `/v1/constants/{key}/archive` | Archive a single constant |
| POST | `/v1/constants/{key}/unarchive` | Unarchive a single constant |

## Machine-readable artifacts (2)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/growthbook/refs/heads/main/openapi/growthbook-constants-api-openapi.yml
- **Documentation** — https://docs.growthbook.io/api

## Other GrowthBook APIs (12)

- [GrowthBook AnalyticsExplorations API](https://apis.io/apis/growthbook/growthbook-analyticsexplorations-api/)
- [GrowthBook Archetypes API](https://apis.io/apis/growthbook/growthbook-archetypes-api/)
- [GrowthBook Attributes API](https://apis.io/apis/growthbook/growthbook-attributes-api/)
- [GrowthBook Code References API](https://apis.io/apis/growthbook/growthbook-code-references-api/)
- [GrowthBook Dashboards API](https://apis.io/apis/growthbook/growthbook-dashboards-api/)
- [GrowthBook Data Sources API](https://apis.io/apis/growthbook/growthbook-data-sources-api/)
- [GrowthBook Dimensions API](https://apis.io/apis/growthbook/growthbook-dimensions-api/)
- [GrowthBook Environments API](https://apis.io/apis/growthbook/growthbook-environments-api/)
- [GrowthBook Experiments API](https://apis.io/apis/growthbook/growthbook-experiments-api/)
- [GrowthBook Fact Metrics API](https://apis.io/apis/growthbook/growthbook-fact-metrics-api/)
- [GrowthBook Fact Tables API](https://apis.io/apis/growthbook/growthbook-fact-tables-api/)
- [GrowthBook Feature Revisions API](https://apis.io/apis/growthbook/growthbook-feature-revisions-api/)

## Tags

Constants

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/growthbook/growthbook-constants-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/growthbook/.