CSV to JSON Converter – Convert CSV to JSON Online Free
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CSV to JSON Converter

Convert CSV spreadsheet data to JSON format online for free. The first row of your CSV becomes the field names in each JSON object — producing a clean array of records ready for use in APIs, web apps, and data pipelines.

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CSV to JSON Converter

Use this converter when you need to feed spreadsheet data into a web application, API, or database that expects JSON. It's also useful when migrating data from Excel or Google Sheets into a JavaScript or Python-based workflow.

Drag & drop your file here

or click to browse from your computer

Accepted: .csv
filename
0 KB

About the CSV to JSON Converter

CSV (Comma-Separated Values) is the universal export format for spreadsheets — almost every data tool can produce a CSV. JSON is the universal input format for web APIs and modern applications. Converting between them is one of the most common data preparation tasks, and this tool handles it with no code required: just upload the CSV, and download a well-structured JSON array.

When to use this tool

Use this converter when you need to feed spreadsheet data into a web application, API, or database that expects JSON. It's also useful when migrating data from Excel or Google Sheets into a JavaScript or Python-based workflow.

Common use cases

Feeding data into a web app Export data from Excel or Google Sheets as CSV, then convert to JSON for use in a JavaScript or React application.
Preparing data for an API Convert a CSV report to JSON before sending it to a REST API endpoint or webhook.
Database seed data Convert a CSV of test records to JSON for seeding a development database or importing into MongoDB, Firestore, etc.
No-code data integration Use this converter as part of a no-code workflow where data from a spreadsheet needs to flow into a JSON-based system.

How to convert your file

  1. Drag your file into the upload box above, or click the area to browse your device.
  2. Confirm the filename and size appear correctly in the preview.
  3. Click Convert Now and wait a few seconds while we process.
  4. Use the green download button to save your converted file.

Tips for best results

  • The first row of your CSV is treated as the header row — these become the keys in each JSON object.
  • Make sure your CSV doesn't have trailing empty rows or columns, as these can create empty objects in the JSON output.
  • For CSVs with special characters or commas inside quoted fields, the parser handles quoted fields correctly.

FAQs

The output is a JSON array of objects. Each row in the CSV becomes an object, and each column header becomes a key. For example, a CSV with Name and Age columns becomes [{"Name":"Alice","Age":"30"}, ...].

The parser handles RFC 4180 standard CSV format, including quoted fields that contain commas, newlines, or quotation marks.

By default, all values are output as strings — this preserves formatting like leading zeros. If you need typed numbers, you'll need to post-process the JSON.

The converter uses the first row as headers. If your CSV has no header row, the first data row will be used as field names — add a header row before converting.

The 10 MB file size limit applies. Text-based CSVs are very compact — a 10 MB CSV can contain hundreds of thousands of rows. For very large datasets, a dedicated ETL tool may be more appropriate.

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