CSV to JSON Converter

Upload a CSV file and convert it to structured JSON. Uses headers as keys for clean, ready-to-use JSON output.

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Transform your CSV data into JSON format

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Supports .csv, .tsv, and .txt files up to 10MB

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Files are processed in memory and deleted immediately. We never store your data.

Why Convert CSV to JSON?

JSON is the standard data format for web APIs, JavaScript applications, and modern databases like MongoDB. Converting CSV to JSON makes your data instantly usable in web applications, REST APIs, and data pipelines without manual transformation.

How the Conversion Works

Our converter reads your CSV headers and uses them as JSON keys, creating an array of objects where each row becomes a JSON object. The output is properly formatted with indentation for readability. Data types are preserved and special characters are correctly escaped.

Frequently Asked Questions

What JSON format does the output use?

By default the output is an array of objects, where each CSV row becomes a JSON object and the column headers become the keys — the most common format for APIs and JavaScript applications. You can also switch to array-of-arrays mode for compact output.

Are data types preserved in the JSON output?

Numbers and booleans are automatically typed in the JSON output — e.g. "42" becomes the number 42 and "true" becomes the boolean true. Strings remain as strings. This makes the output immediately usable without manual type coercion.

What happens if my CSV has duplicate column headers?

If your CSV contains duplicate column headers, the later column's values will overwrite the earlier one in each JSON object. To avoid data loss, rename duplicate headers in your CSV before converting.

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