The csv-parse package is a parser converting CSV text input into arrays or objects. It is part of the CSV project.
It implements the Node.js stream.Transform API. It also provides a simple callback-based API for convenience. It is both extremely easy to use and powerful. It was first released in 2010 and is used against big data sets by a large community.
Run npm install csv to install the full CSV module or run npm install csv-parse if you are only interested by the CSV parser.
Use the callback and sync APIs for simplicity or the stream based API for scalability.
The API is available in multiple flavors. This example illustrates the stream API.
import assert from "assert";
import { parse } from "csv-parse";
const records = [];
// Initialize the parser
const parser = parse({
delimiter: ":",
});
// Use the readable stream api to consume records
parser.on("readable", function () {
let record;
while ((record = parser.read()) !== null) {
records.push(record);
}
});
// Catch any error
parser.on("error", function (err) {
console.error(err.message);
});
// Test that the parsed records matched the expected records
parser.on("end", function () {
assert.deepStrictEqual(records, [
["root", "x", "0", "0", "root", "/root", "/bin/bash"],
["someone", "x", "1022", "1022", "", "/home/someone", "/bin/bash"],
]);
});
// Write data to the stream
parser.write("root:x:0:0:root:/root:/bin/bash\n");
parser.write("someone:x:1022:1022::/home/someone:/bin/bash\n");
// Close the readable stream
parser.end();
The project is sponsored by Adaltas, an Big Data consulting firm based in Paris, France.
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