Readers

Readers are responsible for parsing raw data into JavaScript objects.

CSVReader<T>

Reads Comma-Separated Values.

• Constructor: new CSVReader(source, options?)
• Methods:
  • setFieldNamesInFirstRow(boolean)
  • setFieldSeparator(string)

JsonReader<T>

Reads a JSON array of objects.

• Constructor: new JsonReader(source, options?)

ParquetReader<T>

Reads Apache Parquet files. Requires parquetjs-lite.

• Constructor: new ParquetReader(source, options?)

SQLReader<T>

Reads from a SQL database using a driver-agnostic connection.

• Constructor: new SQLReader(dbClient, query, params?, options?)
• Methods:
  • setChunkSize(number): For paginated reading.
  • setOrderBy(string): Required for stable pagination.

XlsxReader<T>

Reads Excel files. Requires exceljs.

• Constructor: new XlsxReader(source, options?)