CSV ToolsLocal
JSON to CSV
Convert JSON into CSV with optional flattening for nested fields.
CSV Tools
CSV to JSON
Turn CSV into usable JSON with simple header and delimiter controls.
InputCSV, TXT
OutputJSON arrays with header support
Works onAny modern browser
About this tool
Parses CSV, respects headers and delimiters, and returns readable JSON arrays.
Common use cases
- Turn exported spreadsheet rows into JSON arrays for apps or scripts.
- Prepare CSV data for front-end fixtures or API imports.
How to use it
- Paste CSV or upload a file.
- Confirm the delimiter and whether the first row contains headers.
- Convert, then copy or download the JSON output.
Best for
- Turning spreadsheet exports into app-ready JSON arrays
- Preparing local fixtures or imports from CSV rows
- Checking how headers and delimiters will map before an API import
Input and output notes
- Accepted inputs: .csv, .txt.
- Exports are generated locally in the current browser session.
Limits to know
- Large inputs can still be limited by browser memory.
- Unusual delimiters or quoting patterns may need manual confirmation.
Privacy
This tool runs in the browser, so pasted content and uploaded files stay on the current device during normal use.
Common next steps
Pick the right CSV workflow
CSV to JSON is for imports into apps and APIs
Use it when spreadsheet rows need to become JSON arrays that code and APIs can consume.
JSON to CSV is for exports and reportingUse it when structured objects need to become rows that business users can open in spreadsheet tools.
CSV Cleaner is for rough files before conversionStart with cleanup when whitespace, duplicate rows, or inconsistent headers will break the next step.
Common questions
Can it handle larger CSV files?
Yes. Larger inputs switch to a Web Worker so the UI stays responsive while processing.
Does it trim whitespace?
Yes. You can enable whitespace trimming before conversion.