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I am currently building an IoT system using Google cloud, however, the JSON payload when entering the cloud needs to be deserialized.

Do Google cloud have the function of deserializing the data? If so, how could I code it? I am streaming my data from IOT core > pub/sub > data flow > Google bigquery.

You can use Dataflow for complex processing. If it's a simple deserialisation and storage in BigQuery, you can use Cloud Run or Cloud Functions to consume the message, especially if the volume of message is acceptable (few millions per months) - guillaume blaquiere