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