Can this handle semicolon-separated files from European Excel?

Yes — set the delimiter to semicolon, or leave it on auto-detect and it will pick the most likely delimiter from the first lines.

What happens to dotted column headers like address.city?

With nested keys enabled, a header like address.city produces a nested { address: { city: ... } } object instead of a flat key.

Can I convert JSON back into CSV?

Yes, switch direction to JSON → CSV. Nested objects and arrays are flattened using the separator and depth you choose.

Does it guess data types automatically?

Optionally. Type inference can turn "42" into a number, "true"/"false" into booleans, and empty cells into null or empty string based on your policy.

Is there a row limit?

No hard limit is enforced by the tool — it is limited only by your browser's memory, which comfortably handles tens of thousands of rows.

ToolMano

CSV to JSON converter

Convert CSV to JSON and back, with full formatting control.

No uploadNo signupWorks offline

CSV input

Drop files here or click to choose

Load a .csv or .json file

Up to 20 MB

Quick presets

Delimiter

Header row

Output shape

Pretty print

Paste input to see the converted result.

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About csv to json converter

CSV to JSON converter turns spreadsheet exports into clean JSON — as an array of objects, an object keyed by a column, arrays of arrays, or newline-delimited NDJSON — and converts JSON straight back to CSV.

It handles the messy real-world details: custom delimiters and quote characters, header detection, skipped comment rows, type inference for numbers/booleans/dates, dotted-header nesting, and column renaming, filtering and reordering.

A live preview table and a validation errors list show exactly what will be produced before you download, and every step happens in your browser so spreadsheet data never leaves your device.

How to use CSV to JSON converter

1Paste CSV or JSON, or load a file, in the input box.
2Pick the direction: CSV → JSON or JSON → CSV.
3Set delimiter, quoting, header and type-inference options.
4Rename, include, exclude or reorder columns as needed.
5Preview the result and download as .json, .ndjson or .csv.

What it does

Bidirectional CSV ⇄ JSON conversion
Auto-detect or choose delimiter (comma, semicolon, tab, pipe, custom)
Type inference for numbers, booleans, null and dates
Column rename, include/exclude and reorder
Dotted headers become nested JSON objects
Output shapes: array of objects, keyed object, arrays of arrays, NDJSON
JSON → CSV flattening with configurable depth and array join
Live preview table with row count and validation errors
Pretty-print with custom indent, or sorted keys
BOM, line-ending and encoding controls

Frequently asked questions

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