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# Debug Undici (and subsenquently `fetch` and `websocket`) exposes a debug statement that can be enabled by setting `NODE_DEBUG` within the environment. The flags availabile are: ## `undici` This flag enables debug statements for the core undici library. ```sh NODE_DEBUG=undici node script.js UNDICI 16241: connecting to nodejs.org using https:h1 UNDICI 16241: connecting to nodejs.org using https:h1 UNDICI 16241: connected to nodejs.org using https:h1 UNDICI 16241: sending request to GET https://nodejs.org// UNDICI 16241: received response to GET https://nodejs.org// - HTTP 307 UNDICI 16241: connecting to nodejs.org using https:h1 UNDICI 16241: trailers received from GET https://nodejs.org// UNDICI 16241: connected to nodejs.org using https:h1 UNDICI 16241: sending request to GET https://nodejs.org//en UNDICI 16241: received response to GET https://nodejs.org//en - HTTP 200 UNDICI 16241: trailers received from GET https://nodejs.org//en ``` ## `fetch` This flag enables debug statements for the `fetch` API. > **Note**: statements are pretty similar to the ones in the `undici` flag, but scoped to `fetch` ```sh NODE_DEBUG=fetch node script.js FETCH 16241: connecting to nodejs.org using https:h1 FETCH 16241: connecting to nodejs.org using https:h1 FETCH 16241: connected to nodejs.org using https:h1 FETCH 16241: sending request to GET https://nodejs.org// FETCH 16241: received response to GET https://nodejs.org// - HTTP 307 FETCH 16241: connecting to nodejs.org using https:h1 FETCH 16241: trailers received from GET https://nodejs.org// FETCH 16241: connected to nodejs.org using https:h1 FETCH 16241: sending request to GET https://nodejs.org//en FETCH 16241: received response to GET https://nodejs.org//en - HTTP 200 FETCH 16241: trailers received from GET https://nodejs.org//en ``` ## `websocket` This flag enables debug statements for the `Websocket` API. > **Note**: statements can overlap with `UNDICI` ones if `undici` or `fetch` flag has been enabled as well. ```sh NODE_DEBUG=websocket node script.js WEBSOCKET 18309: connecting to echo.websocket.org using https:h1 WEBSOCKET 18309: connected to echo.websocket.org using https:h1 WEBSOCKET 18309: sending request to GET https://echo.websocket.org// WEBSOCKET 18309: connection opened <ip_address> ```