CSV input
id,name 1,Ada 2,Linus
What this tool does
CSV to JSON turns flat spreadsheet-style data into structured JSON arrays. Each CSV row becomes a JSON object, and the header row becomes the set of property names.
This is useful when a team works in spreadsheets but the next step is an API, script, or app that expects JSON.
Common use cases
- Transforming exported spreadsheet data into API fixtures.
- Preparing CSV imports for custom scripts.
- Moving business data into development tooling quickly.
- Creating sample JSON objects from tabular records.
Input and output example
JSON output
[
{
"id": 1,
"name": "Ada"
},
{
"id": 2,
"name": "Linus"
}
]How to use this tool
- Paste CSV with a header row into the left panel.
- Click Convert to JSON.
- Review the output and copy or download it.
- If you need the reverse workflow later, use JSON to CSV.
Your CSV is processed in your browser and is not uploaded to our servers.
Common errors
- Missing header rows create unclear property names.
- Quoted cells with embedded commas can affect weak CSV parsers, so review the output when data is complex.
- Mixed row shapes can produce inconsistent JSON objects.
- Deeply nested JSON cannot be reconstructed from plain CSV alone.
Related tools
FAQ
Does this support nested JSON output?
It supports dotted headers like user.name for nested object paths, but CSV is still fundamentally a flat format.
Can I download the JSON result?
Yes. Generate the output and then download it as a JSON file.
Will numbers stay as strings?
Simple numeric, boolean, and null-looking values are converted automatically when possible.
Can I use this for quick API mock data?
Yes. CSV to JSON is useful when the source data starts in a spreadsheet but the mock API expects JSON.