[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [EmitterConfigurationBase](./node-tracker.emitterconfigurationbase.md) > [customHeaders](./node-tracker.emitterconfigurationbase.customheaders.md) ## EmitterConfigurationBase.customHeaders property An object of key value pairs which represent headers to attach when sending a POST request, only works for POST Signature: ```typescript customHeaders?: Record; ```