CSV to JSON

Convert CSV rows into a pretty-printed JSON file. Choose whether the first row supplies column names.

↑Choose a fileor drop it here.CSV,.TSV · 50 MB per file

Review and edit extracted CSV

Your finishing touches

First row

The first row is treated as object keys when headers are enabled. Output is UTF-8 JSON with 2-space indentation.

Processed in your browser. Your original files are unchanged.

How to use CSV to JSON

Choose a file (CSV / TSV) from your device.
Set first row.
Run the tool, inspect the result, and download your output.

What this tool does

Convert CSV rows into a pretty-printed JSON file. Choose whether the first row supplies column names. The first row is treated as object keys when headers are enabled. Output is UTF-8 JSON with 2-space indentation.

Turn spreadsheet rows into structured JSON

Choose a CSV or TSV file and decide whether the first row holds column names. The converter outputs a pretty-printed JSON file you can use with APIs, scripts, or databases.

Headers or raw arrays

When the first row is treated as headers, each remaining row becomes an object with those keys. Otherwise every row stays as an array, preserving the original table shape.

Questions about CSV to JSON

Are my files uploaded?

This tool processes files in your browser. File contents are not uploaded to FileToast. Downloads stay wherever you save them.

Does this support TSV files?

Yes. Comma and tab delimiters are detected automatically, so both CSV and TSV inputs work.

What happens when the first row is not headers?

Every row is exported as a JSON array, including the first row. This preserves the original table structure without inventing column names.

What are the file and processing limits?

Up to 50 MB per file. Large or complex files can exceed your device’s or the converter’s capacity. The first row is treated as object keys when headers are enabled. Output is UTF-8 JSON with 2-space indentation.