CSV to JSON Converter

Convert CSV data to JSON online with header mapping and smart type detection, no upload needed

Delimiter:

First row is the header Detect types (numbers, booleans, null)

CSV Input

JSON Output

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.

Fonctionnalités professionnelles de traitement CSV to JSON Converter

Tout ce dont vous avez besoin pour travailler avec les données CSV to JSON Converter efficacement et professionnellement

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.

Comment ça marche

Des étapes simples pour traiter vos CSV to JSON Converter comme un pro

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.

Formateur et validateur CSV to JSON Converter professionnel

Utilisé par des millions de développeurs dans le monde pour un traitement CSV to JSON Converter fiable

Conçu par des experts

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.

Fonctionnalités techniques clés :

• 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

Fiable & Sécurisé

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.

Sécurité & Confidentialité :

• 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

Pourquoi les professionnels choisissent EZ Formatter

99.9%

Fiabilité de disponibilité

<100ms

Temps de traitement moyen

10M+

Fichiers CSV to JSON Converter traités mensuellement

Rejoignez des millions de développeurs qui font confiance à notre formateur CSV to JSON Converter pour leur flux de travail quotidien. Inscription non requise, entièrement gratuit et conçu avec le respect de la vie privée.

Questions fréquentes

Réponses aux questions courantes sur le formatage Csv To Json

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.