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javascript/snippets/csv-to-json.md

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+---
+title: CSV to JSON
+type: snippet
+tags: [string,object]
+cover: kettle-laptop
+dateModified: 2022-01-30T12:14:39+02:00
+---
+
+Converts a comma-separated values (CSV) string to a 2D array of objects.
+The first row of the string is used as the title row.
+
+- Use `Array.prototype.indexOf()` to find the first newline character (`\n`).
+- Use `Array.prototype.slice()` to remove the first row (title row) and `String.prototype.split()` to separate it into values, using the provided `delimiter`.
+- 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`.
+- Use `Array.prototype.reduce()` to create an object for each row's values, with the keys parsed from the title row.
+- Omit the second argument, `delimiter`, to use a default delimiter of `,`.
+
+```js
+const CSVToJSON = (data, delimiter = ',') => {
+  const titles = data.slice(0, data.indexOf('\n')).split(delimiter);
+  return data
+    .slice(data.indexOf('\n') + 1)
+    .split('\n')
+    .map(v => {
+      const values = v.split(delimiter);
+      return titles.reduce(
+        (obj, title, index) => ((obj[title] = values[index]), obj),
+        {}
+      );
+    });
+};
+```
+
+```js
+CSVToJSON('col1,col2\na,b\nc,d');
+// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];
+CSVToJSON('col1;col2\na;b\nc;d', ';');
+// [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];
+```