Use Streams to Extract, Transform, and Load CSV Data

Using the fs module and streams, we can take a local file and perform ETL steps on it to transform the file into JSON and write it to disk. We can use a helpful node module from npm, csvtojson, to convert the csv data for us. With these tools, we can:

  • Create a readstream from a local csv file
  • Pipe the csv data to csvtojson to transform it to JSON
  • Alter the data using a Transform stream
  • Write the transformed JSON data to a file using a WriteStream
  • Handle error events

By the end of this tutorial, you should be able to:

  • Explain how to use the fs module to create read/write streams
  • Implement Transform streams to modify data as it passes through a stream
  • Understand how to handle error events with streams
  • Convert CSV data to JSON using streams
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