Is my document uploaded?

No. Processing happens in a browser worker. Documents and filenames are not stored or sent to a server.

Which documents are supported?

CSV cells become text in JSON, preserving values such as 00123. Export accepts flat objects only; missing values and null become empty cells. Escape spreadsheet formulas adds an apostrophe to potentially executable cells and headers. Tables are limited to 200,000 exported cells.

Up to 1 MB of UTF-8 input and 2 MB of output. Processing stops after five seconds; Cancel stops an active operation. Try a smaller document if a limit is reached.

Data tools

CSV to JSON

Convert table data locally. Tool input is processed locally, without uploading it.

Runs locally

Input

Output

Runs locally in your browser

Input: up to 1 MB. Output: up to 2 MB. Files stay in your browser.

Guide

Read a CSV (comma-separated values) table as JSON (JavaScript Object Notation). Choose the delimiter that separates the columns so that each row and field appears in the intended place.

Add your document
Paste into Input, choose an example or use Open file. You can also drop one UTF-8 file into Input.
Choose the format
Select the delimiter used between cells. When exporting, keep Escape spreadsheet formulas enabled for spreadsheet use.
Read and keep the result
Output updates automatically. Use the main button to run it again, then Copy output or Download to keep the result.

On mobile, choose Output to read the result. Clear removes both fields.

Delimiter

Comma: separate table cells with a comma (,).
Semicolon: separate table cells with a semicolon (;).
Tab: separate table cells with a tab character.

Cell values

Cells become text values, preserving leading zeros such as 00123. Choose the delimiter used in your input.

Shortcuts

Ctrl / Cmd + Enter — Run selected action
Ctrl / Cmd + Shift + C — Copy output
Ctrl / Cmd + S — Download output
? — Show shortcuts outside text fields

Shortcuts work while focus is in the workspace. Copy and download need valid output.

Common questions

Is my document uploaded?: No. Processing happens in a browser worker. Documents and filenames are not stored or sent to a server.
Which documents are supported?: CSV cells become text in JSON, preserving values such as 00123. Export accepts flat objects only; missing values and null become empty cells. Escape spreadsheet formulas adds an apostrophe to potentially executable cells and headers. Tables are limited to 200,000 exported cells.
What are the limits?: Up to 1 MB of UTF-8 input and 2 MB of output. Processing stops after five seconds; Cancel stops an active operation. Try a smaller document if a limit is reached.

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