🔄 CSV ↔ JSON Converter

Convert between CSV and JSON instantly. Custom delimiters, column filtering, table preview, and multiple export formats.

📂
Click to upload or drag & drop a .csv file
CSV Input
Options
First row is headers
Trim whitespace
Skip empty rows
Minify JSON output

Free Online CSV to JSON Converter

ToolBox's CSV ↔ JSON Converter lets you quickly transform data between CSV (comma-separated values) and JSON (JavaScript Object Notation) formats. Whether you're preparing data for a REST API, migrating between databases, cleaning up spreadsheet exports, or importing data into a web application, this tool handles it all — entirely in your browser with zero server uploads and complete privacy.

Powerful Conversion Options

Choose from multiple JSON output styles including array of objects, array of arrays, and column-keyed format. Set custom delimiters for CSV input (comma, tab, semicolon, pipe, or any custom character), auto-detect or force numeric types, trim whitespace, skip blank rows, and toggle header detection. When converting JSON back to CSV, flatten nested objects with dot or bracket notation and control quoting behavior. Filter specific columns before conversion to get exactly the data you need.

Preview, Validate & Export

Preview your data in an interactive table before and after conversion. See row and column counts, output file size, and conversion time at a glance. Copy results to clipboard, download as .json or .csv files, or swap input and output to convert back in the other direction. Supports drag-and-drop file upload, paste from clipboard, and includes sample data to get started instantly. No accounts, no limits, no ads — just fast, reliable data conversion.

Copied!