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

    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: null | string

    The end time of the observation

    environment?: null | string

    The environment from which this observation originated

    id: string

    The unique identifier of the observation

    input?: unknown

    The input data of the observation

    internalModelId?: null | string

    The internal model ID matched by Langfuse

    latency?: null | number

    The latency in seconds

    level?: ObservationLevel

    The level of the observation

    metadata?: unknown

    Additional metadata of the observation

    modelId?: null | string

    The matched model ID

    modelParameters?: unknown

    The parameters of the model used for the observation

    name?: null | string

    The name of the observation

    output?: unknown

    The output data of the observation

    parentObservationId: null | string

    The parent observation ID

    projectId: string

    The project ID this observation belongs to

    promptId?: null | string

    The prompt ID associated with the observation

    promptName?: null | string

    The prompt name associated with the observation

    promptVersion?: null | number

    The prompt version associated with the observation

    providedModelName?: null | string

    The model name as provided by the user

    public?: boolean

    Whether the observation is public

    sessionId?: null | string

    The session ID associated with the observation

    startTime: string

    The start time of the observation

    statusMessage?: null | string

    The status message of the observation

    timeToFirstToken?: null | number

    The time to first token in seconds

    totalCost?: null | number

    The total cost of the observation in USD

    traceId: null | string

    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?: null | string

    The user ID associated with the observation

    version?: null | string

    The version of the observation

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