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

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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.

STABLE - used in production

Search or submit any issues for this package

• 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 import:

<script type="module" src="https://cdn.skypack.dev/@thi.ng/csv"></script>

Skypack documentation

For Node.js REPL:

# with flag only for < v16
node --experimental-repl-await

> const csv = await import("@thi.ng/csv");

Package sizes (gzipped, pre-treeshake): ESM: 1.53 KB

• @thi.ng/api
• @thi.ng/checks
• @thi.ng/strings
• @thi.ng/transducers

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";

[...parseCSV(
  {
    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"`,
     `"at","eu","Austria","47.6965545","13.34598005"`,
     `"be","eu","Belgium","50.501045","4.47667405"`,
     `"bg","eu","Bulgaria","42.72567375","25.4823218"`,
  ]
)]

// [
//   { 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:

@misc{thing-csv,
  title = "@thi.ng/csv",
  author = "Karsten Schmidt",
  note = "https://thi.ng/csv",
  year = 2014
}

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