Excel to JSON Converter Online Free

About the Excel to JSON Converter

The Excel to JSON Converter transforms spreadsheet data into structured JSON objects that can be directly used in web applications, APIs, and databases. This is one of the most common data transformation tasks in modern development.

Why Excel to JSON?

Web Development React, Vue, Angular, and other frontend frameworks work with JSON natively. Converting Excel data to JSON lets you use spreadsheet content as a data source for web apps without a backend.

API Testing When populating test fixtures or mock data for API testing (Postman, Insomnia), JSON format is required. Excel to JSON conversion makes creating test datasets fast.

Database Seeding MongoDB, Firebase, and many NoSQL databases accept JSON for bulk data import. Convert your Excel dataset to JSON for quick database population.

Data Migration Moving data between systems often requires transforming from spreadsheet format to JSON for intermediate processing.

How It Works

Each row in your spreadsheet becomes a JSON object. The first row (header row) becomes the key names for each object.

Excel Input: | id | product | price | |----|---------|-------| | 1 | Laptop | 999 | | 2 | Phone | 499 |

JSON Output:

[
  { "id": 1, "product": "Laptop", "price": 999 },
  { "id": 2, "product": "Phone", "price": 499 }
]

Supported Features

• .xlsx and .xls file formats
• Multiple sheet selection
• Automatic type detection (numbers stay numbers, not strings)
• Handles merged cells gracefully
• Processes up to 10,000 rows instantly