Node SDK

jsonVariation

Evaluate a JSON flag and get a structured value back.

The typed helper for JSON flags, for structured configuration. A flag of another type returns your default with ERROR / WRONG_TYPE. The value is not validated against T; treat it as input.

Signature

jsonVariation<T>(key: string, ctx: Context, d: T): T

Example

const limits = flags.jsonVariation('rate-limits', ctx, { rps: 5, burst: 10 });

The SDK is @rollkit/sdk in the repository (packages/sdk). It is for server-side Node; browsers use a client key with the delivery API.

More sdk methods

All sdk methods →

01
createFlagClient
Create the one client your process uses. It starts fetching the snapshot at once.
02
waitForInitialization
Wait until the first snapshot is loaded, or fail after a timeout or a rejected key.
03
variation
Evaluate a flag of any type and get its value, or your default.

More sdk methods

createFlagClient

waitForInitialization

variation