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 ”Header Parameters
Section titled “ Header Parameters ”Why you are making this change, recorded in the audit log. Percent-encoded UTF-8 (encode it the way encodeURIComponent does); at most 2048 characters after decoding. Required when the target environment — or, for project-wide changes, any environment in the project — requires a change reason; without one the request is refused with 422 change_reason_required.
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.
The request is malformed, or it carries an If-Match header, which this endpoint can’t evaluate. Send no If-Match, or *.
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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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.
A change reason is required: this change affects an environment that requires one (error code change_reason_required). Retry with the X-Intent-Reason 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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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, next_actions and connection_id 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.
connection_id is present only on the sso_required error: the organization
requires single sign-on, and this credential didn’t come through its identity provider.
connection_id identifies which SSO connection to sign in with.
plan_limit is present only on the plan_limit_reached error: which plan cap the
request would have exceeded, so a client can branch on it without parsing message.
object
object
object
The cap behind a plan_limit_reached error. resource is the capped collection
(projects, environments, flags, webhooks, members);
plan is the plan’s wire name, as GET /api/v1/orgs/{org} returns it; max is
the cap. The environment and flag caps are per project.
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.