CSV to JSON Converter

Your Spreadsheet Export Meets Your REST API

You exported 200 customer records from Google Sheets. Your React frontend needs them as JSON. You could write a quick Python script with the csv module, but you’d spend more time setting up the script than the conversion would take.

Paste the CSV here. The first row becomes your JSON keys, every other row becomes an object. Numbers stay as numbers (not strings), booleans convert to true/false, and empty cells become null. You get a properly indented JSON array ready to drop into your codebase.

The parser handles the messy edge cases that trip up naive CSV splitting: fields with commas wrapped in double quotes ("New York, NY" stays as one value), escaped quotes inside fields ("" becomes "), and mixed data types across columns.

A Quick Example

name,age,city
John,30,"New York"
Jane,25,London

Turns into:

[
  { "name": "John", "age": 30, "city": "New York" },
  { "name": "Jane", "age": 25, "city": "London" }
]

Notice 30 and 25 are JSON numbers, not "30" and "25". The type detection looks at each value and converts what makes sense.

When This Saves You Real Time

Seeding a MongoDB collection. Your product manager maintains a spreadsheet of test accounts. Export it as CSV, paste it here, copy the JSON, and db.users.insertMany() it directly.

Feeding a React data table. You’ve got a CSV of pricing data from the finance team. Convert it to JSON, save it as a .json file in your project, and import it into your component. No parsing logic needed.

Mock API responses. You’re building a frontend before the backend’s ready. Export sample data from your planning spreadsheet, convert to JSON, and use it as mock data in your dev server.

ETL preprocessing. Your data pipeline expects JSON input. The source system exports CSV. This bridges the gap without writing glue code.

Before converting, run your data through the CSV Validator to catch column count mismatches, unclosed quotes, and trailing commas. Bad CSV in = bad JSON out. For the reverse operation, the JSON to CSV tool is also available.

If your CSV uses semicolons or tabs instead of commas, you’ll need to pre-process the delimiter. This tool expects standard comma-separated format.

Everything runs in your browser. Your data stays on the page.