CSV to JSON & JSON to CSV Converter

Convert CSV to JSON or JSON to CSV instantly with custom delimiters, RFC 4180 parsing compliance, quoted field handling, and 100% private client-side browser execution.

Interactive CSV & JSON Bi-Directional Converter Workspace

Paste or drop tabular CSV records or JSON objects to convert formats in real time with configurable delimiters, data-type auto-detection, and local clipboard copy or download.

✓ RFC 4180 Compliance (Escaped Quotes & Multiline) ✓ Comma, Semicolon & Tab Delimiters ✓ Auto-parse Numbers & Booleans ✓ 100% Client-Side In-Browser Execution

Understanding CSV and JSON Data Structures

CSV (Comma-Separated Values) is a compact, line-oriented tabular data format widely used in spreadsheets, database bulk imports, and export reporting. Each record resides on its own line, with individual field values demarcated by delimiters like commas or semicolons. JSON (JavaScript Object Notation), defined by RFC 8259, is a self-describing hierarchical serialization format standard across modern REST APIs, document databases, and web services. While CSV is ideal for high-density flat datasets, JSON excels at representing structured collections with nested objects, arrays, and explicit data typing.

How to Convert CSV to JSON

  1. Select your conversion mode: Choose 'CSV to JSON' on the converter workspace tabs.
  2. Input your data: Paste raw CSV text, or drag and drop your .csv file into the input pane.
  3. Configure parsing options: Select your field delimiter (Comma, Semicolon, or Tab) and choose whether to automatically parse numeric and boolean values into native JSON types.
  4. Convert and export: Click 'Convert to JSON' to generate formatted JSON. Copy the output to your clipboard or download it directly as a .json file.

How to Convert JSON to CSV

  1. Select JSON to CSV: Click the 'JSON to CSV' mode tab.
  2. Paste your JSON payload: Provide a valid JSON array of objects, where each object represents a tabular row with keys corresponding to column headers.
  3. Set output delimiter: Choose comma, semicolon, or tab as the desired output delimiter.
  4. Run conversion: Click 'Convert to CSV'. The parser extracts unified column headers, quotes fields containing commas or newlines, escapes quotes with RFC 4180 double quotes, and generates clean CSV ready for download.

CSV to JSON Conversion Example

Input CSV with headers and quoted fields:

id,name,role,active,salary
101,"Doe, John",Engineer,true,95000
102,"Smith, Jane",Manager,true,115000

Output JSON array with native types:

[
  {
    "id": 101,
    "name": "Doe, John",
    "role": "Engineer",
    "active": true,
    "salary": 95000
  },
  {
    "id": 102,
    "name": "Smith, Jane",
    "role": "Manager",
    "active": true,
    "salary": 115000
  }
]

RFC 4180 Parsing Rules & Edge Cases

  • Embedded Delimiters: Any field containing the active delimiter must be enclosed in double quotes (e.g., "Austin, TX").
  • Escaped Quotes: If a double quote occurs inside a quoted field, it must be escaped with a preceding double quote ("").
  • Multiline Values: Fields spanning multiple physical lines remain enclosed in double quotes until the closing quotation mark.
  • Empty Fields: Consecutive delimiters (e.g., a,,b) denote empty or null values and are parsed as empty strings in JSON.

Client-Side Privacy & Security Guarantees

Unlike legacy online converters that send customer lists, accounting records, or sensitive CSV spreadsheets across remote servers, OwnFormatters executes 100% of its parsing and serialization routines client-side in your local browser sandbox. No file chunks, text lines, or analytics data ever leave your device.

Frequently Asked Questions (FAQ)

Does this tool convert both CSV to JSON and JSON to CSV?

Yes. OwnFormatters provides a bidirectional converter. You can switch between 'CSV to JSON' and 'JSON to CSV' modes using the tab controls above the editor.

How are commas inside text fields handled?

Our parser adheres strictly to RFC 4180 specifications. Any cell enclosed in double quotes (such as "Smith, Jane") treats internal commas as literal text rather than column separators.

Are numbers and booleans automatically converted?

Yes. When the 'Auto-parse numbers & booleans' option is enabled, valid integer and floating-point values are parsed as numbers (e.g. 42), and true/false values are converted to booleans rather than strings.

Is my CSV or JSON data uploaded to a server?

No. All conversion operations execute 100% locally inside your web browser. Your data never leaves your device and is never transmitted over the internet.

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