CSV to JSON Converter
Convert CSV data to JSON online with header mapping and smart type detection, no upload needed
CSV to JSON Tips
- With the header option on, the first row becomes object keys and every other row becomes an object.
- Type detection turns 42 into a number, true/false into booleans, and empty cells into null - turn it off to keep everything as strings.
- Quoted fields may contain commas, quotes (doubled), and even line breaks - all handled per RFC 4180.
- Auto-detect counts commas, semicolons, and tabs in the first line and picks the most common one.
プロフェッショナルな CSV to JSON Converter 処理機能
CSV to JSON Converter データを効率的かつプロフェッショナルに扱うために必要なすべて
Real CSV Parsing
An RFC 4180 state machine, not split-by-comma: quotes, escaped quotes, and embedded newlines all parse correctly.
Header Mapping
The first row becomes object keys, producing clean arrays of objects ready for APIs.
Type Detection
Numbers, booleans, and null are coerced automatically - or kept as strings with one click.
Delimiter Flexibility
Auto-detection plus manual comma, semicolon, and tab options for any locale.
Instant Conversion
Thousands of rows parse in milliseconds with zero network activity.
Private by Design
Data stays in your browser tab. Close it and everything is gone.
仕組み
CSV to JSON Converter をプロのように処理する簡単なステップ
Paste Your CSV
Copy rows from Excel, Google Sheets, or a .csv file into the input area.
Set the Options
Confirm the delimiter and whether the first row is a header and types should be detected.
Click Convert
Rows are parsed with full RFC 4180 quoting support and mapped to JSON.
Copy the JSON
Copy the pretty-printed output into your script, API client, or database import.
プロフェッショナルな CSV to JSON Converter フォーマッター＆バリデーター
世界中の何百万もの開発者に信頼される CSV to JSON Converter 処理
エキスパートによる構築
CSV looks simple until values contain commas, quotes, or line breaks - then naive split-by-comma parsers silently corrupt your data. This converter implements a real RFC 4180 state machine: it tracks quote state character by character, maps the header row to object keys, and optionally coerces numbers, booleans, and null so the output is ready for APIs, MongoDB imports, and JavaScript.
主な技術的特徴:
- • Full RFC 4180 parser: quoted fields, escaped quotes, embedded newlines
- • Header row mapped to object keys automatically
- • Optional type detection for numbers, booleans, and null
- • Delimiter auto-detection or manual selection
- • Pure client-side conversion - your data never leaves the browser
信頼とセキュリティ
Built for developers who feed spreadsheets into scripts and APIs. The parser runs entirely in your browser, so customer lists and exports are never uploaded anywhere.
セキュリティとプライバシー:
- • 100% client-side conversion - no server uploads, ever
- • No tracking, cookies or data logging
- • HTTPS encryption for secure connections
- • Spreadsheets and exports stay on your device
- • GDPR and CCPA compliant approach
プロがEZ Formatterを選ぶ理由
日常の開発ワークフローに CSV to JSON Converter フォーマッターを信頼する何百万もの開発者に参加してください。登録不要、完全無料、プライバシーを考慮して構築されています。
よくある質問
Csv To Json フォーマットに関するよくある質問
Yes, completely free with no registration. All parsing happens locally in your browser.
Yes, as long as the field is quoted per RFC 4180. The parser correctly handles embedded commas, doubled quotes (""), and multi-line quoted fields - things that break naive split() approaches.
Yes. Turn off the "First row is the header" option and every row - including the first - is emitted as a plain array of strings.
Values that parse as finite numbers become JSON numbers, the exact strings true and false become booleans, and empty cells become null. Any other value stays a string. Disable the option to keep every value as a string.
Yes. Leave the delimiter on auto-detect (it counts candidate delimiters in the first line) or select semicolon or tab manually.