How to Read Data From *.CSV File Using JavaScript?
CSV (Comma-Separated Values) files are a common format for storing tabular data. To read data from a CSV file using JavaScript, we can use external libraries or implement our own parsing functions.
Using jQuery-CSV Library
jQuery-CSV is a popular library for parsing CSV data in JavaScript. It provides a convenient method, $.csv.toObjects(csv), that automatically maps CSV data to an array of objects.
// Assuming you've included jQuery-CSV in your HTML
var data = $.csv.toObjects(csv);
// Output
[
{ heading1: "value1_1", heading2: "value2_1", ... },
{ heading1: "value1_2", heading2: "value2_2", ... },
...
];
Custom Parsing Function
If you don't want to use external libraries, you can create your own parsing function. Here's a simplified example:
function parseCSV(csv) {
// Split the CSV into lines
var lines = csv.split("\n");
// Extract the header line
var headers = lines[0].split(",");
// Remove the header line from the CSV
lines.shift();
// Loop through the remaining lines and create objects
var data = [];
for (var i = 0; i < lines.length; i++) {
// Split the line into values
var values = lines[i].split(",");
// Create an object using the headers as keys
data.push(
Object.fromEntries(
headers.map((h, idx) => [h, values[idx]])
)
);
}
// Return the parsed data
return data;
}
Example CSV Data
heading1,heading2,heading3,heading4,heading5 value1_1,value2_1,value3_1,value4_1,value5_1 value1_2,value2_2,value3_2,value4_2,value5_2
Output
[
{ heading1: "value1_1", heading2: "value2_1", ... },
{ heading1: "value1_2", heading2: "value2_2", ... },
...
];
Note: The example CSV data does not have line breaks. It's recommended to add line breaks to make the data valid CSV before parsing.
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