CSV ↔ JSON Converter — Free Developer & Technical Tools

CSV ↔ JSON Converter

Bidirectional CSV ↔ JSON with auto delimiter detection and RFC 4180 quoting

Delimiter

Output shape

CSV inputUpload file

Output

[
  {
    "name": "Ada Lovelace",
    "email": "ada@example.com",
    "role": "Engineer",
    "active": "true"
  },
  {
    "name": "Alan Turing",
    "email": "alan@example.com",
    "role": "Researcher",
    "active": "true"
  },
  {
    "name": "Grace \"Amazing Grace\" Hopper",
    "email": "grace@example.com",
    "role": "Rear Admiral, USN",
    "active": "false"
  }
]

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About the CSV ↔ JSON Converter

CSV and JSON are the two most common data interchange formats — CSV for spreadsheets and analytics, JSON for APIs and configuration. Moving between them correctly is harder than it looks: quoted fields, embedded newlines, and non-comma delimiters all break naive converters. This tool implements the RFC 4180 spec and handles every edge case.

Features

Bidirectional CSV ↔ JSON
Automatic delimiter detection (comma, tab, semicolon, pipe)
RFC 4180-compliant quoting — escapes quotes, embedded newlines, delimiters
First row as header OR array-of-arrays output
File upload + download
Union-of-keys header row when JSON rows have different keys

How it works

Pick CSV → JSON or JSON → CSV.
Paste or upload your data on the left.
Choose delimiter (auto-detect by default) and output shape.
Copy or download the result.

Use cases

Data migration
API payload preparation
Excel to JSON conversion
Exporting JSON to spreadsheets
Backend data seeding

Frequently asked questions

Which delimiters are supported?

Comma, tab, semicolon, and pipe — either manually selected or auto-detected. The detector sniffs the first non-blank line, ignoring content inside quoted fields.

Does it handle embedded newlines and commas?

Yes. Fields containing newlines, commas, or quote characters are emitted with RFC 4180 double-quoting and parsed back correctly.

What if my JSON rows have different keys?

The CSV output uses the union of all keys, preserving first-seen order. Missing cells are empty strings.

Can I convert nested JSON?

Deeply-nested objects are JSON-stringified into the cell. Flat CSV can't represent true nesting — if you need it, keep the JSON.

Is my data uploaded anywhere?

No. Conversion happens entirely in your browser; uploaded files never leave your machine.