CSV naar JSON Converter

Overview

CSV and JSON are the two formats data moves through most often — spreadsheets, APIs, exports, and config files. CSV is compact and spreadsheet-friendly; JSON is structured and code-friendly. This converter transforms data in both directions instantly, right in your browser, so you can reshape an export for an API or flatten an API response into a spreadsheet. Because everything happens locally, even large or sensitive datasets never leave your device.

How to Use (Step by Step)

1. 1

   Paste your CSV or JSON

   Drop your data into the input box — the tool detects the direction or lets you choose.

2. 2

   Convert and review

   The converted output appears instantly, with validation warnings if any rows or fields are malformed.

3. 3

   Copy or download the result

   Copy the output to your clipboard or save it as a file for your project.

How It Works

The tool parses your input in the browser using JavaScript. For CSV→JSON, it reads the header row as object keys and turns each subsequent row into an object, handling quoted fields and commas inside values. For JSON→CSV, it flattens an array of objects into rows, using the object keys as the header. Validation flags malformed rows or invalid JSON so you can fix the source before exporting. No data is uploaded to a server.

When to Use This

Turning a spreadsheet export into JSON to seed an API or app. Flattening an API's JSON response into CSV to open in Excel or Google Sheets. Quickly inspecting or cleaning a dataset during development. Converting config or fixture data between formats. Sharing data with a teammate who needs the other format. Any one-off conversion where spinning up a script would be overkill.

Frequently Asked Questions