Is this RFC 4180 CSV?

It follows RFC 4180 quoting: fields may be quoted, quotes are escaped as "", and quoted fields may contain newlines. Dialects still vary. Pick the delimiter if detection is wrong.

Are numbers converted automatically?

Only if you enable type inference. Leading-zero IDs and integers outside the safe integer range stay strings so they are not corrupted.

No. Parsing runs in your browser. DataToolMage does not send the table to a server.

Format

CSV to JSON

Paste a delimited table and get an array of objects. Delimiters can be detected. Type inference is optional and conservative.

Input is processed in your browser. DataToolMage does not upload it, store it, or send it to analytics.

CSV input

DelimiterFirst row is a headerInfer numbers, booleans, and null

JSON result

Paste structured data. Work stays in this browser.

How it works

A local RFC-style parser splits rows, then maps columns to object keys. Detection looks at the first line only.

Input and output

Input is delimited text. Output is a JSON array of objects. Binary spreadsheets are out of scope.

Common uses

Header row

name,qty\ntea,2 becomes [{"name":"tea","qty":"2"}] unless inference is on.

Quoted comma

"Smith, Ada",42 stays one field, not two.

How to use this tool

Paste CSV or TSV into the input.
Confirm the delimiter, header row, and whether types should be inferred.
Copy or download the JSON array.

Limitations

Not an Excel/Office file converter.
Header-less tables get column_1, column_2, … keys.
Very large tables are rejected by row, cell, and byte limits.

Questions

Is this RFC 4180 CSV?: It follows RFC 4180 quoting: fields may be quoted, quotes are escaped as "", and quoted fields may contain newlines. Dialects still vary. Pick the delimiter if detection is wrong.
Are numbers converted automatically?: Only if you enable type inference. Leading-zero IDs and integers outside the safe integer range stay strings so they are not corrupted.
Is my CSV uploaded?: No. Parsing runs in your browser. DataToolMage does not send the table to a server.