Free CSV to JSON Converter
Convert any CSV or Excel file to JSON instantly — array of objects, array of arrays, or nested by key. No file upload. No signup. No limits.
Drop your CSV or Excel file here, or click to browse
CSV and Excel files supported. Your data never leaves your browser.
Who uses CSV to JSON Converter?
Real teams solving real problems — see if your use case is here.
Backend Developer
Software EngineeringProduct manager sends updated pricing tiers in a spreadsheet. Developer needs a JSON array to seed a config file or test fixture — without writing a one-off parser script.
Pastes CSV, copies the JSON array in 10 seconds. No Python, no script, no waiting for a data engineer.
Data Engineer
Data / AnalyticsLegacy ETL exports customer data as CSV. The modern REST API endpoint expects a JSON body. Need a one-off conversion before the pipeline is built.
Converts 50,000 rows to JSON objects using 'nested by key' mode to group by customer_id. Pipeline handoff done.
Mobile App Developer
App DevelopmentLocalisation strings are maintained in a shared spreadsheet with en, fr, and de columns. The i18n library requires separate JSON files per language.
Converts the spreadsheet, downloads language JSON files, drops them into the /locales/ directory. Zero manual formatting.
Marketing Ops
Marketing TechnologyAn email segmentation list sits in CSV format and needs uploading to a REST API endpoint that only accepts JSON. No engineering resources are available this sprint.
Converts 12,000 contacts to a JSON array, uploads via Postman. No dev ticket needed, campaign launches on time.
How to convert CSV to JSON online
Upload your file
Drop your CSV or Excel file into the tool. It's read directly in your browser — no server upload happens at any point.
Choose your output format
Array of objects (most common for APIs and databases), array of arrays (compact, used by charting libraries), or nested by first column (lookup tables and config files).
Copy or download your JSON
Your JSON appears immediately. Copy it to clipboard or download it as a .json file. Large files are truncated in the preview but the download is always complete.