Is my spreadsheet data safe when using this converter?

Yes, 100%. The conversion runs entirely client-side inside your web browser. Neither your CSV tables, email lists, nor proprietary JSON payloads are ever transmitted to any remote server.

Does it support custom delimiters like TSV (tab) and semicolon?

Yes. The tool features intelligent auto-detection for commas, tabs, semicolons, and pipes, or you can explicitly select your required delimiter from the settings drawer.

How does it handle nested JSON objects when converting to CSV?

With 'Flatten nested objects' enabled, nested keys are automatically flattened into dot notation headers (e.g., user.address.city), producing clean, human-readable tabular output.

Data Transformer

CSV ⇄ JSON ⇄ TSV Data Converter

Convert comma-separated CSV or tab-separated TSV tables to structured JSON, and JSON arrays to CSV. 100% private in-browser conversion — zero server uploads.

Load Sample:

Parsing & Serialization Options

Delimiter

JSON Shape

Indentation

Header in 1st rowParse numbers & bools

Input CSV / TSV

Upload

417 characters6 lines

[
  {
    "id": 1,
    "first_name": "Sarah",
    "last_name": "Jenkins",
    "email": "s.jenkins@acme.com",
    "company": "Acme Corp",
    "city": "San Francisco, CA",
    "revenue": 48500.5,
    "active": true
  },
  {
    "id": 2,
    "first_name": "Marcus",
    "last_name": "Vance",
    "email": "marcus@globex.io",
    "company": "Globex Logistics",
    "city": "Austin, TX",
    "revenue": 12900,
    "active": true
  },
  {
    "id": 3,
    "first_name": "Elena",
    "last_name": "Rostova",
    "email": "e.rostova@inno.de",
    "company": "InnoTech GmbH",
    "city": "Berlin",
    "revenue": 94200.75,
    "active": false
  },
  {
    "id": 4,
    "first_name": "Tariq",
    "last_name": "Mansour",
    "email": "tariq@apex.ae",
    "company": "Apex Holding",
    "city": "Dubai",
    "revenue": 185000,
    "active": true
  },
  {
    "id": 5,
    "first_name": "Chloe",
    "last_name": "Dubois",
    "email": "chloe@lumina.fr",
    "company": "Lumina Studio",
    "city": "Paris",
    "revenue": 32100.2,
    "active": true
  }
]

5 rows · 8 columnsValid RFC 4180

Dataset Statistics

Total Records:5

Total Columns:8

Delimiter Used:Auto-detected

Inferred Column Types

id:numberfirst_name:stringlast_name:stringemail:stringcompany:stringcity:stringrevenue:numberactive:boolean

100% In-Browser Privacy

Your customer lists, spreadsheets, and private CSV data never leave your computer. Processing occurs in your browser memory without cloud servers or telemetry.

CSV vs. JSON Format Capabilities & Tradeoffs

Feature	CSV (RFC 4180)	JSON (RFC 8259)
Data Structure	Flat 2D grid (rows & columns)	Hierarchical trees, objects & nested arrays
Native Data Types	Strings only (all fields are plain text)	String, Number, Boolean, Null, Object, Array
Bandwidth & File Size	Compact (header defined once)	Higher overhead (keys repeated for every object)
Spreadsheet Compatibility	Native (Excel, Google Sheets, LibreOffice)	Requires PowerQuery or script import
Primary Ecosystem	Data science, financial reporting, ETL bulk exports	REST APIs, NoSQL databases, web apps

RFC 4180 CSV Escaping Rules & Edge Cases

Edge Case Scenario	Raw Data Content	Properly Escaped CSV Representation	Rule Explanation
Contains Delimiter	San Francisco, CA	"San Francisco, CA"	Field must be wrapped in double quotes
Contains Quotes	12" Screen	"12"" Screen"	Internal quotes must be doubled ("")
Multiline Text	Line 1\nLine 2	"Line 1\nLine 2"	Enclosing quotes preserve internal line breaks
Leading Zeroes	01234 (ZIP)	"01234"	Kept as string to prevent 1234 corruption

How to Convert CSV to JSON and Back Online

Select Direction: Choose "CSV ➔ JSON" for spreadsheet files, or "JSON ➔ CSV" to transform API payloads.
Paste Data or Upload File: Drop your .csv, .tsv, or .json file into the input box or click a sample preset.
Switch Views & Export: Review the generated code or switch to "Table View" for an interactive spreadsheet grid. Click "Copy" or "Download".

Frequently Asked Questions

100% In-Browser Privacy

Your spreadsheets, email lists, and customer data never leave your computer. Processing occurs strictly in local RAM.

Practical Knowledge Base

In-Depth Guides & Tutorials

Formulas, industry standards, and best practices for CSV to JSON & TSV Converter.

Browse all guides

Article9 min read

CSV vs. JSON: The Definitive Guide to RFC 4180 Escaping, Type Coercion, and Data Flattening

Master RFC 4180 CSV specifications, handle commas in quotes, navigate type conversions, and flatten complex nested JSON into spreadsheets.

Read full tutorial

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