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Showing content from https://c2fo.github.io/fast-csv/docs/parsing/options below:

Options | Fast-CSV

All of the following options can be passed to any of the parse methods.

Type: boolean Default: true

Ensure that all rows are emitted as objects.

If set to false all data will be a JSON version of the row.

Type: string Default: ','

The delimiter that will separate columns.

Set this option if your file uses an alternate delimiter such as ; or \t. Example

When specifying an alternate delimiter you may only pass in a single character!

Type: string|null Default: '"'

The character to use to quote fields that contain a delimiter.

(e.g. "first,name",last name => ['first,name', 'last name'])

If you set to null then all quoting will be ignored.

Type: string Default: '"'

The character to used tp escape quotes inside of a quoted field.

i.e: First,"Name"' => '"First,""Name"""

Type: boolean|string[]|(string[]) => string[]) Default: false

If set to true the first row will be treated as the headers. Example

If you want to manually specify the headers set to a string[]. Example

If you wish to discard the first row and use your own headers you need to set the renameHeaders option to true

If you wish to transform the headers you can provide a transform function. Example

If your rows are arrays, and you wan to skip certain columns you can provide a sparse array. Example

When setting the headers option to a function it will always rename the headers

If you specify headers and there are more columns than headers the following rules will apply

• If you have strictColumnHandling set to true a data-invalid event will be emitted and parsing will continue.
• If strictColumnHandling is not specified an error will be emitted and parsing will stop.
• If you have set discardUnmappedColumns to true the extra columns will be dropped.

If headers either parsed, provided or transformed are NOT unique, then an error will be emitted and the stream will stop parsing.

Type: boolean Default: false

If you want the first line of the file to be removed and replaced by the one provided in the headers option. Example

This option should only be used if the headers option is a string[]

If the headers option is a function then this option is always set to true.

Type: boolean Default: false

Set to true to ignore empty rows. Example

this will discard columns that are all white space or delimiters.

Type: string|null Default: null

If your CSV contains comments you can use this option to ignore lines that begin with the specified character (e.g. #).

Type: boolean Default: false

If you want to discard columns that do not map to a header.

This is only valid in the case when the number of parsed columns is greater than the number of headers.

Type: boolean Default: false

If you want to consider empty lines/lines with too few fields as invalid and emit a data-invalid event

This option is only considered when headers are present.

Type: boolean Default: false

Set to true to trim all white space from columns.

Type: boolean Default: false

Set to true to right trim all columns.

Type: boolean Default: false

Set to true to left trim all columns.

Type: string Default: 'utf8'

Passed to StringDecoder when decoding incoming buffers. Change if incoming content is not 'utf8' encoded.

Type: number Default: 0

If number is > 0 then only the specified number of rows will be parsed.(e.g. 100 would return the first 100 rows of data). Example

Type: number Default: 0

If number is > 0 then the specified number of parsed rows will be skipped. Example

Type: number Default: 0

If number is > 0 the specified number of lines will be skipped. Example

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