Is my JSON or CSV uploaded to Convertr?

No. Conversion runs entirely in your browser. Pasted data, headers, field names and values are not uploaded to Convertr servers.

How are nested JSON objects converted to CSV?

Nested object keys are flattened with dot notation. Arrays inside objects are encoded as JSON strings so each CSV cell keeps the original value.

Which CSV delimiters are supported?

The converter supports commas, semicolons, tabs and pipes. Auto-detect chooses the delimiter that creates the most consistent rows.

Can I convert CSV with quoted fields and line breaks?

Yes. The CSV parser supports quoted fields, escaped quotes, commas inside quotes and multiline values.

JSON to CSV Converter

Flatten JSON into CSV or turn CSV rows into JSON locally in your browser. Useful for API responses, logs, exports and spreadsheet cleanup.

Input JSON

0 characters

Output CSV

Result appears here. Everything runs in your browser.

Ready

Conversion options

Direction CSV delimiter First CSV row is header Use header names as JSON object keys when converting CSV. Pretty JSON output Turn off to produce compact JSON for CSV to JSON conversion.

Nested object keys use dot notation. Arrays and nested values inside cells are preserved as JSON strings. Analytics uses size and count buckets only, never pasted content or field names.

API response flattening

Turn arrays of objects, single objects and mixed keys into a predictable CSV table.

CSV import prep

Convert spreadsheet exports into JSON arrays while preserving quoted fields and multiline values.

Private local processing

Conversion runs in JavaScript on your device. There is no upload endpoint for pasted JSON or CSV.

Related developer tools

JSON Formatter

Format, validate and minify JSON

JSON Schema Validator

Validate JSON against a schema online

CSV Formatter

Validate rows and delimiters

CSV Validator

Check row counts, headers and delimiters

CSV to TSV

Convert CSV, TSV and Excel locally

CSV to Excel

Create XLSX workbooks from CSV or TSV

XLSX to CSV

Convert spreadsheets into CSV files

ICS to CSV

Turn calendar exports into CSV rows

Extract Tables from PDF

Create CSV from PDF tables

PDF to Excel

Create XLSX workbooks from PDF tables

Developer Tools

More browser-native utilities

Video

Audio

Image

Font

PDF/Document

Utilities