JSON to CSV Converter Online

Convert JSON arrays to CSV format and CSV back to JSON. Free online converter with instant results.

JSON to CSV Conversion

This tool converts JSON arrays of objects into CSV (Comma-Separated Values) format. Object keys become CSV column headers, and each object becomes a row. It handles special characters, commas in values, and nested objects.

CSV to JSON

The reverse conversion takes CSV data with a header row and converts each row into a JSON object, producing a JSON array of objects.

About This Tool

The JSON to CSV Converter transforms JSON arrays of objects into CSV (Comma-Separated Values) spreadsheet format, and converts CSV data back to JSON arrays. It is built for data analysts, developers, and data engineers who need to move structured data between APIs and spreadsheet tools.

Key Features

  • Bidirectional Conversion — Converts JSON arrays to CSV with auto-detected column headers, and converts CSV back to JSON arrays of objects with header-mapped keys.
  • Auto Column Detection — Automatically infers column names from the object keys in the JSON array without requiring any manual configuration.
  • Handles Nested Data — Flattens simple nested objects and arrays into CSV-compatible string representations for compatibility with spreadsheet software.
  • Browser-Based Processing — All conversion runs locally in your browser. Your data never leaves your device.
  • Free & No Signup — Use this tool as many times as you need without creating an account or paying anything.

Common Use Cases

  • Exporting API response data from a REST endpoint into CSV for analysis in Excel or Google Sheets
  • Converting database query results exported as JSON into CSV format for reporting or data import
  • Transforming CSV data from a spreadsheet export into JSON arrays for feeding into a web application
  • Preparing data migration scripts by converting between JSON and CSV formats for ETL pipelines
  • Validating that the column structure of a JSON dataset matches the expected CSV schema before import

How to Use

Select JSON to CSV or CSV to JSON mode using the toggle. Paste your input data into the left panel. Click Convert to process the data. The result appears in the right panel. Use the Copy button to copy the output to your clipboard or the Download button to save it as a file.

Frequently Asked Questions

What JSON structure can be converted to CSV?

Only JSON arrays of flat objects can be directly converted to CSV. Each object in the array becomes a row, and its keys become column headers. Nested objects or arrays are converted to their string representation.

Why does my CSV have missing values in some cells?

Missing values appear when objects in the JSON array have different keys. The converter uses all unique keys as columns, leaving cells empty where an object does not have that key.

Can I open the CSV output in Excel?

Yes. Copy the CSV text and paste it into a text editor, save it with a .csv extension, and Excel will open it correctly. Alternatively, use the Download button to save the file directly.

What delimiter does the CSV output use?

The converter uses commas as the default delimiter. Values that contain commas or quote characters are wrapped in double quotes per the RFC 4180 CSV specification to prevent parsing errors.

Related Tools

JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings instantly.
Diff Checker
Compare two texts and highlight the differences line by line.

Workflow Links

Suggested step-by-step tools based on this page intent.

Before This Tool

JSON to CSV ConverterConvert JSON arrays to CSV files. Custom delimiters, file upload, instant download.JSON to XML ConverterConvert JSON data to XML format. Handles nested objects, arrays, and attributes.CSV ViewerView CSV data as a formatted table. Sort columns, search, and filter rows.

Next Step Tools

JSON to CSV ConverterConvert JSON arrays to CSV files. Custom delimiters, file upload, instant download.JSON to XML ConverterConvert JSON data to XML format. Handles nested objects, arrays, and attributes.XML to JSON ConverterConvert XML data to JSON format. Handles nested elements, attributes, and arrays.