Function: open()

open(source, options?): FilingReader

Open a filing for streaming. The header and cover are read now; rows are read as you iterate, one batch at a time.

Read it with one of FilingReader.itemizations, FilingReader.rows or FilingReader.records, then close it:

const filing = open("1805248.fec");
try {
  for (const row of filing.itemizations()) {
    switch (row.itemization.type) {
      case "ScheduleA": console.log(row.itemization.contribution_amount); break;
    }
  }
} finally {
  filing.close();
}

On Node 24+, Deno and Bun, using filing = open(…) closes it for you.

A bytes source is read in place: don't modify it while the reader is open.

Parameters

source

Source

A path, a file: URL, or the file's bytes.

options?

OpenOptions = {}

Returns

FilingReader

Throws

A Node-style error (code: "ENOENT", …) if the path can't be opened, or FecParseError if the header or cover can't be parsed.

Function: open() ​

Parameters ​

source ​

options? ​