Query Traces

pip install langfuse

from langfuse import Langfuse
langfuse = Langfuse(
  secret_key="sk-lf-...",
  public_key="pk-lf-...",
  host="https://cloud.langfuse.com"  # 🇪🇺 EU region
  # host="https://us.cloud.langfuse.com" # 🇺🇸 US region
)
 
### Dedicated fetch_* methods for core entities
 
# Fetch list of traces, supports filters and pagination
traces = langfuse.fetch_traces()
 
# Fetch a single trace by ID
trace = langfuse.fetch_trace("traceId")
 
# Fetch list of observations, supports filters and pagination
observations = langfuse.fetch_observations()
 
# Fetch a single observation by ID
observation = langfuse.fetch_observation("observationId")
 
# Fetch list of sessions
sessions = langfuse.fetch_sessions()
 
### Methods on langfuse.api namespace for other entities (generated from the API reference)
 
# Fetch a single score by ID
langfuse.api.score.get("scoreId")
 
# Explore more entities via Intellisense
langfuse.api.*

npm install langfuse

import { Langfuse } from "langfuse";
const langfuse = new Langfuse({
  secretKey: "sk-lf-...",
  publicKey: "pk-lf-...",
  baseUrl: "https://cloud.langfuse.com", // 🇪🇺 EU region
  // baseUrl: "https://us.cloud.langfuse.com", // 🇺🇸 US region
});
 
 
 
// Dedicated fetch* methods for core entities
 
// Fetch list of traces, supports filters and pagination
const traces = await langfuse.fetchTraces();
 
// Fetch a single trace by ID
const trace = await langfuse.fetchTrace("traceId");
 
// Fetch list of observations, supports filters and pagination
const observations = await langfuse.fetchObservations();
 
// Fetch a single observation by ID
const observation = await langfuse.fetchObservation("observationId");
 
// Fetch list of sessions
const sessions = await langfuse.fetchSessions();
 
 
 
// Methods on langfuse.api namespace for other entities (generated from the API reference)
 
// Fetch list of scores
const scores = await langfuse.api.scoreGet();
 
// Fetch a single score by ID
const score = await langfuse.api.scoreGetById("scoreId");
 
// Explore more entities via Intellisense
langfuse.api.*