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This project is part of the @thi.ng/umbrella monorepo.


Customizable, transducer-based CSV parser/object mapper and transformer.

Partially ported and extended from the Clojure versions of the ws-ldn-1 and resonate-2014 workshop repos.


The parser supports customizable delimiters, quoted and unquoted cells, line breaks within quoted cells. Being transducer based, memory usage is kept at a minimum by only processing single lines of (pre-split) text. For CSV records spanning multiple lines (due to line breaks), new results are only emitted/processed downstream once a logical CSV row is complete.

Also, being transducer based means the parser can be easily integrated into more complex data preparation, cleaning or conversion workflows. See @thi.ng/transducers for more details/ideas.


BETA - possibly breaking changes forthcoming

Search or submit any issues for this package

Planned features

  • Simple CSV row parsing w/o object mapping (parseCSVSimple())
  • CSV output from structured data
  • CSVW support (#257)
  • Integration with thi.ng/egf


yarn add @thi.ng/csv
// ES module
<script type="module" src="https://unpkg.com/@thi.ng/csv?module" crossorigin></script>

// UMD
<script src="https://unpkg.com/@thi.ng/csv/lib/index.umd.js" crossorigin></script>

Package sizes (gzipped, pre-treeshake): ESM: 1.07 KB / CJS: 1.15 KB / UMD: 1.16 KB



Generated API docs

Also see extensive doc strings for parseCSV() and CSVOpts. See parseCSVSimple() and parseCSVFromString() for alternatives and syntax sugar forms.

import { parseCSV, upper, float } from "@thi.ng/csv";

    all: false,
    cols: {
      "country": { tx: upper },
      "latitude": { alias: "lat", tx: float(0) },
      "longitude": { alias: "lon", tx: float(0) },
     `"country","country group","name (en)","latitude","longitude"`,

// [
//   { country: 'AT', lat: 47.6965545, lon: 13.34598005 },
//   { country: 'BE', lat: 50.501045, lon: 4.47667405 },
//   { country: 'BG', lat: 42.72567375, lon: 25.4823218 }
// ]


Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

  title = "@thi.ng/csv",
  author = "Karsten Schmidt",
  note = "https://thi.ng/csv",
  year = 2014


© 2014 - 2021 Karsten Schmidt // Apache Software License 2.0

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