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snippets/js/s/csv-to-array.md

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+---
+title: CSV to array
+type: snippet
+language: javascript
+tags: [string,array]
+cover: keyboard-tea
+dateModified: 2022-01-30T12:14:39+02:00
+---
+
+Converts a comma-separated values (CSV) string to a 2D array.
+
+- Use `Array.prototype.indexOf()` to find the first newline character (`\n`).
+- Use `Array.prototype.slice()` to remove the first row (title row) if `omitFirstRow` is `true`.
+- Use `String.prototype.split()` to create a string for each row.
+- Use `String.prototype.split()` to separate the values in each row, using the provided `delimiter`.
+- Omit the second argument, `delimiter`, to use a default delimiter of `','`.
+- Omit the third argument, `omitFirstRow`, to include the first row (title row) of the CSV string.
+
+```js
+const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>
+  data
+    .slice(omitFirstRow ? data.indexOf('\n') + 1 : 0)
+    .split('\n')
+    .map(v => v.split(delimiter));
+```
+
+```js
+CSVToArray('a,b\nc,d'); // [['a', 'b'], ['c', 'd']];
+CSVToArray('a;b\nc;d', ';'); // [['a', 'b'], ['c', 'd']];
+CSVToArray('col1,col2\na,b\nc,d', ',', true); // [['a', 'b'], ['c', 'd']];
+```