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🔄 CSV ↔ JSON Converter

Convert between CSV and top-level flat JSON arrays with header validation, error hints, and local copy.

V1 is a text-only converter. `CSV -> JSON` accepts standard comma-separated CSV with a header row, and `JSON -> CSV` only accepts a top-level array of flat row objects with `string / number / boolean / null` values. Inputs and outputs are processed in the current browser and are not uploaded to LittleOne Tools servers; broken input is not auto-repaired.

CSV must start with a header row, and JSON must use a top-level array. Switching direction never overwrites your input.

You can copy the output only after the latest successful conversion. Any input change or direction switch invalidates the old result immediately.

Status Initial
Rows 0
Columns 0
Warnings 0
Errors 0 
Waiting for input.

Boundary note: this version does not support TSV, semicolon CSV, auto delimiter detection, JSON Lines, single-object roots, nested JSON, automatic type coercion, header repair, or data cleaning. `JSON -> CSV` accepts flat scalar values only.

Formula risk: if the exported CSV is opened in Excel or Calc, cells starting with `=`, `+`, `-`, or `@` may be interpreted as formulas. This tool does not silently rewrite those values.

Privacy note: parsing, conversion, and copy actions run in the current browser. Input text and converted output are not uploaded to LittleOne Tools servers, and no remote data source is fetched.

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Convert standard comma-separated CSV with a header row into JSON object arrays, or convert top-level flat JSON object arrays into standard CSV text. Input text, converted output, and copy actions are processed in the current browser and are not uploaded to LittleOne Tools servers. TSV, auto delimiter detection, JSON Lines, nested objects, and data cleaning are not included.