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JSON CSV Converter

Convert JSON to CSV and CSV back to JSON in the browser.

  • Runs locally in your browser
  • No upload required

Try it

Paste JSON or CSV. It is converted in your browser and never uploaded.

Result
name,role Ada,pioneer
name,role
Ada,pioneer

Supported formats

Input
text
Output
text

Privacy

Runs entirely in your browser. Your input is never uploaded, stored, or sent to a third party.

Processing
In your browser
Privacy level
Browser only

Converted 67 characters from json to csv.

How it works

  • Parsed the input with the pure in-browser engine.
  • Applied the documented CSV mapping rules.
  • Collected an explicit warning for every lossy transformation.
  • The conversion produced 0 warning(s); warnings are shown before the result.

Methodology

  1. Parse JSON with the F054 verbatim scanner, or CSV with the F056 RFC 4180 parser.
  2. For JSON to CSV, use the first-seen union of object keys as the header.
  3. Emit CRLF records with RFC 4180 quoting and report every lossy step.

Usage

  1. Choose JSON to CSV or CSV to JSON.
  2. Paste the document.
  3. Run the tool; read any warnings before copying the result.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

JSON to CSV

jsonSelect to copy
{
  "text": "[{\"name\":\"Ada\",\"role\":\"pioneer\"},{\"name\":\"Alan\",\"role\":\"engineer\"}]",
  "direction": "json-to-csv"
}

CSV to JSON

jsonSelect to copy
{
  "text": "name,role\r\nAda,pioneer",
  "direction": "csv-to-json"
}

Limitations

CSV structure

A CSV file is a header row followed by records. When JSON objects have different keys, the header is the union of keys in first-seen order and missing cells are empty.

Frequently asked questions

Which CSV dialect is produced?
RFC 4180: fields containing a comma, quote or newline are double-quoted, and embedded quotes are doubled.
Why is my number a string after a round trip?
CSV cells are text by definition; the JSON→CSV direction warns that typed values become strings.
Is my data uploaded?
No. The conversion runs entirely in your browser and is never sent anywhere.

Sources

  1. RFC 4180 — Common Format and MIME Type for Comma-Separated Values (CSV) Files — IETF
  2. RFC 8259 — The JavaScript Object Notation (JSON) Data Interchange Format — IETF
  • ReferenceCSV Format Reference

    A concise reference for RFC 4180 CSV: delimiters, quoting, escaping, line endings and encodings.

  • ComparisonJSON Formatter vs JSON Validator

    When to reformat JSON and when to validate it, and why the two tools answer different questions.

  • ReferenceJSON Pointer (RFC 6901) Reference

    The RFC 6901 JSON Pointer syntax, its escaping rules, and worked examples for addressing a single value inside a JSON document.

  • ComparisonJSON vs YAML

    How JSON and YAML differ in syntax, typing, and guarantees, and what that means when you convert a document between them.

  • CategoryJSON

    Format, validate, and understand JSON data.

  • CategoryDeveloper Tools

    Utilities and guides for formatting, validating, and shipping developer data.