Adds a variation to the resolved flag.
const url = 'https://api.featureflip.io/api/v1/orgs/example/projects/example/flags/example/variations';const options = { method: 'POST', headers: {Authorization: '<Authorization>', 'Content-Type': 'application/json'}, body: '{"key":"express","name":"Express Checkout","value":"express","description":"One-click express checkout variant."}'};
try { const response = await fetch(url, options); const data = await response.json(); console.log(data);} catch (error) { console.error(error);}curl --request POST \ --url https://api.featureflip.io/api/v1/orgs/example/projects/example/flags/example/variations \ --header 'Authorization: <Authorization>' \ --header 'Content-Type: application/json' \ --data '{ "key": "express", "name": "Express Checkout", "value": "express", "description": "One-click express checkout variant." }'Requires at least Member. Re-fetches the flag via GetFeatureFlagQuery and locates the new variation by the id returned from AddVariationCommand so the response reflects exactly what was persisted.
Authorizations
Section titled “Authorizations”Parameters
Section titled “Parameters”Path Parameters
Section titled “Path Parameters”Request Body
Section titled “Request Body”Request body for
POST /api/v1/orgs/{org}/projects/{project}/flags/{flag}/variations. Named distinctly
from the dashboard’s own AddVariationRequest —
see PublicCreateEnvironmentRequest for the schemaId-collision rationale (both
controllers share one Swagger document).
object
Example
{ "key": "express", "name": "Express Checkout", "value": "express", "description": "One-click express checkout variant."}Request body for
POST /api/v1/orgs/{org}/projects/{project}/flags/{flag}/variations. Named distinctly
from the dashboard’s own AddVariationRequest —
see PublicCreateEnvironmentRequest for the schemaId-collision rationale (both
controllers share one Swagger document).
object
Example
{ "key": "express", "name": "Express Checkout", "value": "express", "description": "One-click express checkout variant."}Request body for
POST /api/v1/orgs/{org}/projects/{project}/flags/{flag}/variations. Named distinctly
from the dashboard’s own AddVariationRequest —
see PublicCreateEnvironmentRequest for the schemaId-collision rationale (both
controllers share one Swagger document).
object
Example
{ "key": "express", "name": "Express Checkout", "value": "express", "description": "One-click express checkout variant."}Responses
Section titled “Responses”Created
A single variation on a flag, as returned in Variations.
object
Capability hints: which operations the authenticated caller may perform on this resource, each with allowed + optional reason. Computed from the caller’s role and the resource’s state. Injected at runtime; safe to ignore. Present only on top-level resource responses — nested occurrences (e.g. a rule inside a targeting-config response) do not carry it.
object
One entry in a resource’s _actions block: may the caller perform it, and if not, why.
object
Example
{ "id": "0197b6a0-6a1b-7d4f-8c2e-2f3a4b5c6d7e", "key": "true", "name": "Enabled", "value": "true", "description": "Serve the new checkout."}Headers
Section titled “Headers”The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.
Bad Request
The frozen public-API error contract. error codes are stable snake_case strings. Wire keys
are frozen snake_case too (error, message, docs_url, fields,
retry_after) — the global camelCase naming policy would otherwise emit
docsUrl/retryAfter, breaking the published spec. !:JsonPropertyName
always wins over the policy, so these are pinned explicitly rather than relying on the
property names already being lowercase for the single-word ones.
did_you_mean and next_actions are ADDITIVE optional keys (null → omitted via
the global DefaultIgnoreCondition = WhenWritingNull), so pre-existing error bodies
are byte-for-byte unchanged when they’re absent.
object
object
object
Example
{ "error": "not_found", "message": "Flag 'new-checkout-flw' was not found in project 'checkout'.", "docs_url": "https://featureflip.io/docs/management-api/errors/not_found", "did_you_mean": [ "new-checkout-flow" ], "next_actions": [ { "method": "GET", "path": "/api/v1/orgs/acme/projects/checkout/flags" } ]}Headers
Section titled “Headers”The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.
Authentication is required, or the supplied API token is invalid or expired.
The frozen public-API error contract. error codes are stable snake_case strings. Wire keys
are frozen snake_case too (error, message, docs_url, fields,
retry_after) — the global camelCase naming policy would otherwise emit
docsUrl/retryAfter, breaking the published spec. !:JsonPropertyName
always wins over the policy, so these are pinned explicitly rather than relying on the
property names already being lowercase for the single-word ones.
did_you_mean and next_actions are ADDITIVE optional keys (null → omitted via
the global DefaultIgnoreCondition = WhenWritingNull), so pre-existing error bodies
are byte-for-byte unchanged when they’re absent.
object
object
object
Example
{ "error": "not_found", "message": "Flag 'new-checkout-flw' was not found in project 'checkout'.", "docs_url": "https://featureflip.io/docs/management-api/errors/not_found", "did_you_mean": [ "new-checkout-flow" ], "next_actions": [ { "method": "GET", "path": "/api/v1/orgs/acme/projects/checkout/flags" } ]}Headers
Section titled “Headers”The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.
Forbidden
The frozen public-API error contract. error codes are stable snake_case strings. Wire keys
are frozen snake_case too (error, message, docs_url, fields,
retry_after) — the global camelCase naming policy would otherwise emit
docsUrl/retryAfter, breaking the published spec. !:JsonPropertyName
always wins over the policy, so these are pinned explicitly rather than relying on the
property names already being lowercase for the single-word ones.
did_you_mean and next_actions are ADDITIVE optional keys (null → omitted via
the global DefaultIgnoreCondition = WhenWritingNull), so pre-existing error bodies
are byte-for-byte unchanged when they’re absent.
object
object
object
Example
{ "error": "not_found", "message": "Flag 'new-checkout-flw' was not found in project 'checkout'.", "docs_url": "https://featureflip.io/docs/management-api/errors/not_found", "did_you_mean": [ "new-checkout-flow" ], "next_actions": [ { "method": "GET", "path": "/api/v1/orgs/acme/projects/checkout/flags" } ]}Headers
Section titled “Headers”The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.
Not Found
The frozen public-API error contract. error codes are stable snake_case strings. Wire keys
are frozen snake_case too (error, message, docs_url, fields,
retry_after) — the global camelCase naming policy would otherwise emit
docsUrl/retryAfter, breaking the published spec. !:JsonPropertyName
always wins over the policy, so these are pinned explicitly rather than relying on the
property names already being lowercase for the single-word ones.
did_you_mean and next_actions are ADDITIVE optional keys (null → omitted via
the global DefaultIgnoreCondition = WhenWritingNull), so pre-existing error bodies
are byte-for-byte unchanged when they’re absent.
object
object
object
Example
{ "error": "not_found", "message": "Flag 'new-checkout-flw' was not found in project 'checkout'.", "docs_url": "https://featureflip.io/docs/management-api/errors/not_found", "did_you_mean": [ "new-checkout-flow" ], "next_actions": [ { "method": "GET", "path": "/api/v1/orgs/acme/projects/checkout/flags" } ]}Headers
Section titled “Headers”The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.
Rate limit exceeded. Retry after the interval indicated by the Retry-After header.
The frozen public-API error contract. error codes are stable snake_case strings. Wire keys
are frozen snake_case too (error, message, docs_url, fields,
retry_after) — the global camelCase naming policy would otherwise emit
docsUrl/retryAfter, breaking the published spec. !:JsonPropertyName
always wins over the policy, so these are pinned explicitly rather than relying on the
property names already being lowercase for the single-word ones.
did_you_mean and next_actions are ADDITIVE optional keys (null → omitted via
the global DefaultIgnoreCondition = WhenWritingNull), so pre-existing error bodies
are byte-for-byte unchanged when they’re absent.
object
object
object
Example
{ "error": "not_found", "message": "Flag 'new-checkout-flw' was not found in project 'checkout'.", "docs_url": "https://featureflip.io/docs/management-api/errors/not_found", "did_you_mean": [ "new-checkout-flow" ], "next_actions": [ { "method": "GET", "path": "/api/v1/orgs/acme/projects/checkout/flags" } ]}Headers
Section titled “Headers”Number of seconds to wait before retrying the request.
The maximum number of requests permitted per rate-limit window for this caller.
The number of requests remaining in the current rate-limit window.
The UTC time at which the current rate-limit window resets, as a Unix timestamp in seconds.