# C2FO/fast-csv

CSV parser and formatter for node

Repository: https://github.com/C2FO/fast-csv
Canonical: https://ross.abutalabs.com/products/fast-csv
Homepage: http://c2fo.github.io/fast-csv
Language: TypeScript
License: MIT
License Family: permissive
Topics: csv, typescript, csv-parsing, csv-parser, csv-format, stream, nodejs
Last push: 2026-08-26T17:39:22+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 51, longevity 100
- inputs: {"age_days": 5105, "days_push": 7, "days_rel": 119, "gap_med": 280.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1788, forks 220 (observed 2026-08-28T04:05:36.411796+00:00)

## What it is
fast-csv is a Node.js library for parsing and formatting CSV and other delimiter-separated files, written in TypeScript. It is stream-based to handle large files with a low memory footprint and offers flexible parsing and formatting options.

## Use cases
- parse large csv files in node without loading them into memory
- write csv files from node.js data
- convert delimited text files to json objects
- stream csv data through a node pipeline
- import csv exports into a database
- generate csv reports from application data

## When to choose
- you need high-performance csv parsing or writing in Node.js
- you work with large files and want stream-based, low-memory processing
- you want flexible options for quoting, delimiters, and escaping
- you prefer a TypeScript-first library with typed APIs

## When to avoid
- you need csv handling outside the Node.js ecosystem
- you need full spreadsheet formats like xlsx rather than plain csv
- you need a browser-only csv parser

## Facets
- artifact type: library
- maturity: stable
- function: parser, serialization, csv, streaming
- domain: files, developer-tools
- platform: cli
- tags: csv-parsing, csv-formatting, typescript, streams, delimited-files, data-engineering, nodejs

## Member repositories
- C2FO/fast-csv (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:36.411796+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:23:19.708411+00:00, confidence not recorded.
  - readme: https://github.com/C2FO/fast-csv (fetched 2026-08-28T04:05:36.411796+00:00, sha 47f0ecf040a4)
  - homepage: http://c2fo.github.io/fast-csv (fetched 2026-08-29T11:02:37.011613+00:00, sha ca1af3c1218c)
  - registry_npm: https://registry.npmjs.org/fast-csv (fetched 2026-08-29T11:02:37.021262+00:00, sha c95a64476273)
- Data as of 2026-08-30T08:39:29.467469+00:00.