CSV to JSON Batch Converter Online Free
Switch between CSV and JSON without leaving the browser. Drop several .csv files to build one combined JSON object keyed by filename, or turn a JSON array into clean CSV. Delimiters are auto-detected, numbers can be coerced to real types, and results are ready to copy or download instantly.
CSV to JSON Batch Converter In-Browser Workspace
Input data or select files to begin. 100% private, client-side execution with zero server transmission.
How to Use CSV to JSON Batch Converter
- Step 1: CSV → JSON: drop multiple .csv files (or paste text), pick a delimiter or leave it on auto-detect, then click 'Convert to JSON'.
- Step 2: Toggle 'First row is header' and 'Auto-detect numbers' to shape the output objects.
- Step 3: JSON → CSV: paste a JSON array or drop a .json file, choose a delimiter, and click 'Convert to CSV'.
- Step 4: Copy the result or download it as .json / .csv.
About CSV to JSON Batch Converter
The converter parses delimited text with a proper quoting state machine (handling quoted fields, escaped quotes, and CRLF line endings), then maps each row to a JS object. In the JSON direction it flattens arrays or objects into rows and serializes them with safe quoting. Because it runs entirely client-side, proprietary spreadsheets and data files never leave your machine. Batch, multi-file conversion is part of the Pro tier.
Frequently Asked Questions
How many CSV files can I convert at once?
Pro removes single-file limits and lets you combine many files into one JSON object in a single pass.
Does it handle quoted commas inside fields?
Yes. The parser respects standard CSV quoting, including escaped double-quotes and multi-line fields.
Are my files uploaded?
No. Parsing and serialization happen fully in your browser.
Which delimiters are supported?
Comma, semicolon, and tab — with an auto-detect option for the CSV direction.