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flagsmith Features API

Manage feature flags within a project. Features can be toggled on or off and can have remote configuration values.

flagsmith Features API is one of 9 APIs that flagsmith publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include Features. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an AsyncAPI specification.

This API exposes 7 operations across 4 paths, and defines 6 schemas. It is described by OpenAPI 3.1.0, at version 1.0.

Requests are made against a single base URL, https://api.flagsmith.com/api/v1.

7 operations 4 paths 6 schemas 1 DELETE3 GET1 PATCH1 POST1 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0
Base URL
https://edge.api.flagsmith.com
Authentication
API Key
Terms of Service
Resource Areas
1

Authentication & Security 1

flagsmith Features API declares 1 security scheme for authenticating requests. An API key is passed in the header as Authorization (apiKeyAuth). By default, every request must be authenticated.

  • apiKeyAuth — A secret Organisation API Token prefixed with 'Api-Key'. For example, 'Api-Key your-token-here'. This token should never be exposed in client-side code.

Paths & Operations 7

Across 4 paths, the API surfaces 7 operations — 1 DELETE, 3 GET, 1 PATCH, 1 POST, 1 PUT. Each is listed below with its method, path, parameters, and response codes.

Features 7

Manage feature flags within a project. Features can be toggled on or off and can have remote configuration values.

GET
/projects/{project_id}/features/
List features for a project
listFeatures 1 param → 200401404
POST
/projects/{project_id}/features/
Create a feature flag
createFeature 1 param body → 201400401404
GET
/projects/{project_id}/features/{feature_id}/
Get a feature flag
getFeature 2 params → 200401404
PUT
/projects/{project_id}/features/{feature_id}/
Update a feature flag
updateFeature 2 params body → 200400401404
DELETE
/projects/{project_id}/features/{feature_id}/
Delete a feature flag
deleteFeature 2 params → 204401404
GET
/environments/{environment_api_key}/featurestates/
List feature states for an environment
listFeatureStates 1 param → 200401404
PATCH
/environments/{environment_api_key}/featurestates/{feature_state_id}/
Update a feature state
updateFeatureState 2 params body → 200400401404

Schemas 6

The contract defines 6 schemas that model the data the API accepts and returns. The most detailed are AdminFeature (12 properties), FeatureInput (7 properties), FeatureState (7 properties), MultivariateOption (6 properties). Each schema is shown below with its type and property counts.

FeatureState
object
The state of a feature flag within a specific environment, including its enabled status and current value.
7 properties
FeatureStateInput
object
Input object for updating a feature state
2 properties
FeatureInput
object
Input object for creating or updating a feature flag
7 properties 1 required
MultivariateOption
object
A multivariate option representing one of the possible values for a multivariate feature flag.
6 properties
PaginatedResponse
object
A paginated response wrapper containing the results count and navigation links.
4 properties
AdminFeature
object
A feature flag definition in the admin API containing full metadata and configuration options.
12 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

flagsmith-features-api-openapi.yml Raw ↑

Other APIs flagsmith publishes across the network.

Flagsmith Flags API
flagsmith Environments API
flagsmith Identities API
flagsmith Organisations API
flagsmith Projects API
flagsmith Segments API
flagsmith Users API
flagsmith Webhooks API
Where this information came from

This is an independent, third-party profile of flagsmith Features API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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