How to use
- Paste your data or open a UTF-8 text file; try the sample to see the expected input.
- Choose the options and run the tool, or enable automatic conversion.
- Review the result, then copy the selection, copy everything or download a file.
CSV to JSON
Turn CSV rows into JSON with explicit header and type options.
Comparison, parsing and formatting run in your browser. Your input is not sent to DevToolsy.
How it works
Choose comma, semicolon, tab or pipe, or detect the delimiter. Quoted delimiters and multiline cells are supported. Without a header, fields are named column1, column2 and so on.
name,active
Ada,true
Lin,false[
{
"name": "Ada",
"active": "true"
},
{
"name": "Lin",
"active": "false"
}
]Turn CSV rows into JSON with explicit header and type options.
Options and data fidelity
Values remain strings by default, preserving leading zeros. Type inference recognizes JSON numbers, true, false and null without rounding. Blank or duplicate headers and inconsistent column counts are rejected.
CSV conversion supports up to 50,000 data rows and 1,000 columns, within the input and output size limits.
Working with the result
Files are read as UTF-8 text. The editors provide search, selection copying and keyboard shortcuts. Results can be copied or downloaded; changing the input invalidates the previous result.
UTF-8 input up to 1 MiB per document; output up to 8 MiB. Tasks run in a local worker with a 30-second time limit.
Frequently asked questions
Which CSV separators and headers are supported?
Choose comma, semicolon, tab or pipe, or detect the delimiter. Quoted delimiters and multiline cells are supported. Without a header, fields are named column1, column2 and so on.
How are leading zeros and value types handled?
Values remain strings by default, preserving leading zeros. Type inference recognizes JSON numbers, true, false and null without rounding. Blank or duplicate headers and inconsistent column counts are rejected.
Is my input uploaded?
No. Comparison, parsing and formatting run in your browser. Your input is not sent to DevToolsy.
Can I open a local file?
Yes. Open a UTF-8 text file of up to 1 MiB. Each comparison input has its own file picker.
Can I copy only part of the result?
Yes. Select text in an editor and use Copy selection, or use the standard keyboard shortcut.