[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [EmitterConfigurationBase](./node-tracker.emitterconfigurationbase.md) > [customFetch](./node-tracker.emitterconfigurationbase.customfetch.md) ## EmitterConfigurationBase.customFetch property Enables overriding the default fetch function with a custom implementation. Signature: ```typescript customFetch?: (input: Request, options?: RequestInit) => Promise; ```