Build your CSV ⇄ JSON Converter with AI in under 5 minutes

Build a CSV to JSON converter (and JSON to CSV) that handles quoted fields, headers, type coercion, and custom delimiters — entirely in the browser, so your data never leaves the page.

仕組み

ステップ 1

アイデアを入力

作りたいものを自然な文章で入力してください。

ステップ 2

AIがビルド

FloopFloopが本番対応コードを即座に生成します。

ステップ 3

デプロイして公開

数分以内に専用サブドメインでプロジェクトが公開されます。

開発者を採用する代わりにAIでビルドする理由

FloopFloop従来の開発者
リリースまでの時間5分未満2〜8週間
費用$0から$5,000〜$50,000以上
メンテナンスプランに含まれる継続的な保守契約

What is a csv to json converter?

A CSV to JSON converter turns the rows-and-commas format that spreadsheets export into the structured objects that APIs and apps expect — and back again. It sounds trivial until you hit a value with a comma in it: proper CSV wraps that field in quotes, and a value can even contain line breaks or quote characters, which is why splitting on commas falls apart on real data. Developers reach for a converter constantly — loading a spreadsheet export into a script, turning an API's JSON response into something openable in Excel, reshaping data between tools, or just inspecting a messy file. The useful ones parse CSV by the RFC 4180 rules so quoted fields survive, let you choose whether the first row is a header, coerce text into real numbers and booleans where it makes sense, and handle tabs and other delimiters — all without uploading your data anywhere, which matters when it's customer or financial information.

Common features

  • CSV → JSON and JSON → CSV
  • RFC 4180 quoted-field parsing
  • Header row → object keys
  • Type coercion (numbers, booleans) with id safety
  • Custom delimiters (comma, tab, semicolon, pipe)
  • Pretty or compact JSON output
  • A swap button to round-trip the data
  • Inline error for invalid JSON
  • Everything client-side; input remembered
  • Light and dark themes

Real-world examples

A spreadsheet export

Someone pastes a CSV exported from Excel — with addresses that contain commas — and gets clean JSON objects to feed into a script.

API data into a spreadsheet

A developer pastes an API's JSON array, switches to JSON → CSV, and opens the result in their spreadsheet app.

A TSV file

A user selects the Tab delimiter to parse a tab-separated export without find-and-replacing anything.

Why FloopFloop fits csv to json converter projects

A data converter is a tool you want instant, ad-free, and — because the data is often sensitive — private. FloopFloop ships the converter you want — nested-JSON flattening, an XML or YAML mode, a column picker, a drag-and-drop file loader — on your own domain, with every byte parsed in the browser and nothing uploaded. The 'data pipeline' that ships by default puts source and result side by side with a swap between them, and it's one prompt away from being whatever fits your data.

試してみてください

以下のプロンプトをコピーしてFloopFloopに貼り付けてお使いください。

Build a bidirectional CSV ⇄ JSON converter with two panes. CSV → JSON parses CSV following RFC 4180 (quoted fields can contain commas, newlines, and "" escaped quotes), uses the first row as the object keys when 'header' is on, and optionally coerces numbers and booleans (but leaves zero-padded ids as strings). JSON → CSV turns an array of objects into CSV, using the union of all keys as the header and quoting any field that contains the delimiter, a quote, or a newline. Add a delimiter selector (comma / tab / semicolon / pipe), a pretty-JSON toggle, a swap button that round-trips the output back in, and copy. Show an inline error for invalid JSON. Keep it deterministic so the first render is hydration-safe, and remember the input in localStorage. 100% client-side.

Create a CSV to JSON converter: paste CSV, get JSON. Handle quoted values with commas in them, and let me pick whether the first row is a header. Keep it in the browser.

Build a tool to convert JSON to CSV and CSV to JSON, with a dark theme, for cleaning up API and spreadsheet data.

Build a CSV parser that outputs JSON, coercing numbers and booleans, with a custom delimiter option for TSV files.

よくある質問

Does it handle commas inside a field?
Yes. It follows the RFC 4180 rules, so a field wrapped in quotes can contain commas, line breaks, and escaped quotes ("") without breaking the parse — exactly where a naive split-on-comma would go wrong.
Can it convert JSON back to CSV?
Yes — it's bidirectional. JSON → CSV takes an array of objects, builds the header from the union of all keys, and quotes any value that needs it. The swap button flips the direction and feeds the output back in, so you can round-trip and check.
What is type coercion?
CSV values are all text, but JSON has real types. With coercion on, '42' becomes the number 42 and 'true' becomes the boolean true, while things that look like ids — '0042', leading-zero values — stay strings so you don't lose data. Turn it off to keep everything as strings.
Does it work with tab-separated (TSV) files?
Yes — pick Tab from the delimiter selector and it parses TSV the same way, or any other delimiter (semicolon, pipe) your data uses.
Is my data uploaded?
No. All parsing and conversion happens in your browser and your input is saved to localStorage only — nothing is sent to a server, which matters when the data is sensitive. The single outbound surface is the /api/health probe.

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