Langfuse JS/TS SDKs
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    Interface ObservationV2

    An observation from the v2 API with field-group-based selection. Core fields are always present. Other fields are included only when their field group is requested.

    interface ObservationV2 {
        bookmarked?: boolean;
        completionStartTime?: string | null;
        costDetails?: Record<string, number>;
        createdAt?: string;
        endTime: string | null;
        environment?: string | null;
        id: string;
        input?: unknown;
        internalModelId?: string | null;
        latency?: number | null;
        level?: ObservationLevel;
        metadata?: unknown;
        modelId?: string | null;
        modelParameters?: unknown;
        name?: string | null;
        output?: unknown;
        parentObservationId: string | null;
        projectId: string;
        promptId?: string | null;
        promptName?: string | null;
        promptVersion?: number | null;
        providedModelName?: string | null;
        public?: boolean;
        sessionId?: string | null;
        startTime: string;
        statusMessage?: string | null;
        timeToFirstToken?: number | null;
        totalCost?: number | null;
        traceId: string | null;
        type: string;
        updatedAt?: string;
        usageDetails?: Record<string, number>;
        userId?: string | null;
        version?: string | null;
    }
    Index

    Properties

    bookmarked? completionStartTime? costDetails? createdAt? endTime environment? id input? internalModelId? latency? level? metadata? modelId? modelParameters? name? output? parentObservationId projectId promptId? promptName? promptVersion? providedModelName? public? sessionId? startTime statusMessage? timeToFirstToken? totalCost? traceId type updatedAt? usageDetails? userId? version?

    Properties

    bookmarked?: boolean

    Whether the observation is bookmarked

    completionStartTime?: string | null

    The completion start time of the observation

    costDetails?: Record<string, number>

    The cost details of the observation. Key is the cost metric name, value is the cost in USD.

    createdAt?: string

    The creation timestamp of the observation

    endTime: string | null

    The end time of the observation

    environment?: string | null

    The environment from which this observation originated

    id: string

    The unique identifier of the observation

    input?: unknown

    The input data of the observation

    internalModelId?: string | null

    The internal model ID matched by Langfuse

    latency?: number | null

    The latency in seconds

    level?: ObservationLevel

    The level of the observation

    metadata?: unknown

    Additional metadata of the observation

    modelId?: string | null

    The matched model ID

    modelParameters?: unknown

    The parameters of the model used for the observation

    name?: string | null

    The name of the observation

    output?: unknown

    The output data of the observation

    parentObservationId: string | null

    The parent observation ID

    projectId: string

    The project ID this observation belongs to

    promptId?: string | null

    The prompt ID associated with the observation

    promptName?: string | null

    The prompt name associated with the observation

    promptVersion?: number | null

    The prompt version associated with the observation

    providedModelName?: string | null

    The model name as provided by the user

    public?: boolean

    Whether the observation is public

    sessionId?: string | null

    The session ID associated with the observation

    startTime: string

    The start time of the observation

    statusMessage?: string | null

    The status message of the observation

    timeToFirstToken?: number | null

    The time to first token in seconds

    totalCost?: number | null

    The total cost of the observation in USD

    traceId: string | null

    The trace ID associated with the observation

    type: string

    The type of the observation (e.g. GENERATION, SPAN, EVENT)

    updatedAt?: string

    The last update timestamp of the observation

    usageDetails?: Record<string, number>

    The usage details of the observation. Key is the usage metric name, value is the number of units consumed.

    userId?: string | null

    The user ID associated with the observation

    version?: string | null

    The version of the observation

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