Environment Variables

Node.js

@pydantic/logfire-node reads these variables:

Variable	Purpose
`LOGFIRE_TOKEN`	Write token used to send traces, metrics, and logs to Logfire.
`LOGFIRE_API_KEY`	API key for platform APIs such as remote managed variables.
`LOGFIRE_SERVICE_NAME`	Service name resource metadata.
`LOGFIRE_SERVICE_VERSION`	Service version resource metadata.
`LOGFIRE_ENVIRONMENT`	Deployment environment resource metadata.
`LOGFIRE_CONSOLE`	Set to `true` to also print spans to the console.
`LOGFIRE_SEND_TO_LOGFIRE`	Set sending behavior. `if-token-present` sends only when a token exists.
`LOGFIRE_DISTRIBUTED_TRACING`	Set to `false` to suppress extraction of incoming trace context.
`LOGFIRE_TRACE_SAMPLE_RATE`	Head sampling rate from `0` to `1`.
`LOGFIRE_BASE_URL`	Override the Logfire API base URL.

@pydantic/logfire-cf-workers reads Worker environment values:

Variable	Purpose
`LOGFIRE_TOKEN`	Write token used by the Worker exporter.
`LOGFIRE_ENVIRONMENT`	Deployment environment metadata.
`LOGFIRE_BASE_URL`	Override the Logfire API base URL.

Store production values as Worker secrets.

@pydantic/logfire-browser does not read Logfire credentials from environment variables. Configure a traceUrl that points at your backend proxy.

Platforms such as Deno and Vercel’s OpenTelemetry integration use standard OTLP environment variables:

Variable	Purpose
`OTEL_EXPORTER_OTLP_ENDPOINT`	Base OTLP endpoint, such as `https://logfire-api.pydantic.dev`.
`OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`	Trace endpoint, such as `https://logfire-api.pydantic.dev/v1/traces`.
`OTEL_EXPORTER_OTLP_METRICS_ENDPOINT`	Metric endpoint, such as `https://logfire-api.pydantic.dev/v1/metrics`.
`OTEL_EXPORTER_OTLP_HEADERS`	Headers for OTLP export, including `Authorization=your-write-token`.