I'm looking at the NPM package csv-parser that parses csv files to JSON. Based on the example provided, you can read a csv file row by row in the following manner:
fs.createReadStream('data.csv')
.pipe(csv())
.on('data', (rowData) => console.log(rowData))
.on('end', () => { console.log("done reading the file") });
Is there any way I can only return the header values of the CSV file instead?
You can use headers event
fs.createReadStream('data.csv')
.pipe(csv())
.on('headers', (headers) => {
console.log(`First header: ${headers[0]}`)
})
From official docs
https://www.npmjs.com/package/csv-parser#headers-1
In addition to this answer https://stackoverflow.com/a/66756097/12285424, if you only need to read headers, you should destroy the read stream in order to stop it from parsing the entire file, e.g:
let myHeaders;
let readStream = fs.createReadStream('data.csv');
readStream
.pipe(csv())
.on('headers', (headers) => {
console.log(`First header: ${headers[0]}`)
myHeaders = headers;
readStream.destroy();
})
https://github.com/mafintosh/csv-parser#headers-1
Emitted after the header row is parsed. The first parameter of the event callback is an Array[String] containing the header names.
use .on('headers', (headers) event
fs.createReadStream('data.csv')
.pipe(csv())
.on('headers', (headers) => {
console.log(headers)
})
