Encountering problems when parsing CSV files with Papaparser

I am using Papaparser to parse a CSV file, but the headers in the CSV file contain both numbers and strings. Papaparser is parsing the number headers first before the string headers. Here is an example of my CSV file:

Date,1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,Above20Net
2022-01-10,0.0,0.0,0.0,0.0,0.0,66.3,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0
2022-01-09,7.0,0.0,0.9,1.7,1.7,84.9,98.2,99.5,99.6,99.6,99.6,99.6,99.6,99.7,99.7,99.7,99.7,99.7,99.7,99.9,99.9,100.0
javascriptcsvdatenumberspapaparse

Answer №1

In JavaScript, object properties are ordered with integer keys first by default, and this behavior is not specific to PapaParse. (see: Does JavaScript guarantee object property order?)

When using the {header: true} option while parsing, a fields property is accessible within the meta object of the result that contains an array of columns in the order they appear in the input.

const csvInput = `Date,1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,Above20Net
2022-01-10,0.0,0.0,0.0,0.0,0.0,66.3,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0
2022-01-09,7.0,0.0,0.9,1.7,1.7,84.9,98.2,99.5,99.6,99.6,99.6,99.6,99.6,99.7,99.7,99.7,99.7,99.7,99.7,99.9,99.9,100.0`

const parsed = Papa.parse(csvInput, {header: true});

console.log('meta.fields: ', parsed.meta.fields);
console.log('result object: ', parsed);

// unparsing respects the original column ordering
console.log(Papa.unparse(parsed));
<script src="https://cdnjs.cloudflare.com/ajax/libs/PapaParse/5.3.1/papaparse.min.js"></script>

Using the {header: false} option in parsing will return an array of arrays containing all elements in the original input order.

const csvInput = `Date,1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,Above20Net
2022-01-10,0.0,0.0,0.0,0.0,0.0,66.3,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0
2022-01-09,7.0,0.0,0.9,1.7,1.7,84.9,98.2,99.5,99.6,99.6,99.6,99.6,99.6,99.7,99.7,99.7,99.7,99.7,99.7,99.9,99.9,100.0`

const parsed = Papa.parse(csvInput, {header: false});

console.log('result object: ', parsed);
<script src="https://cdnjs.cloudflare.com/ajax/libs/PapaParse/5.3.1/papaparse.min.js"></script>

An alternative to consider is d3-dsv (delimiter separated values) from the d3 library. It parses data into objects (sorting column keys) but provides a columns property for retrieving header columns in their input order.

const csvInput = `Date,1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,Above20Net
2022-01-10,0.0,0.0,0.0,0.0,0.0,66.3,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0,100.0
2022-01-09,7.0,0.0,0.9,1.7,1.7,84.9,98.2,99.5,99.6,99.6,99.6,99.6,99.6,99.7,99.7,99.7,99.7,99.7,99.7,99.9,99.9,100.0`

const parsed = d3.csvParse(csvInput);

console.log('header columns: ', parsed.columns);
console.log('parsed data objects: ', parsed);
<script src="https://cdn.jsdelivr.net/npm/d3-dsv@3"></script>

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