JSON ↔ CSV Converter

JSON and CSV are the two most common formats for structured data exchange. JSON (JavaScript Object Notation) is used extensively in web APIs, configuration files, and NoSQL databases — it supports nested structures, arrays, and mixed data types. CSV (Comma-Separated Values) is the universal format for spreadsheets, data imports, and tabular data — it is supported by Excel, Google Sheets, MySQL, PostgreSQL, and virtually every data tool.

The need to convert between them arises constantly in data work: exporting an API response to analyse in Excel, importing a spreadsheet into a database that expects JSON, transforming data between analytics pipelines, or migrating between tools with different format requirements. Manual conversion is error-prone and time-consuming for more than a few records.

Altairys's JSON ↔ CSV Converter handles both directions. JSON to CSV: it flattens nested objects (using dot notation for nested keys), handles arrays of objects, and produces a properly formatted CSV with headers derived from the JSON keys. CSV to JSON: it converts each row to a JSON object using the header row as keys, automatically detecting data types (numbers, booleans, and strings). The tool handles special characters, quoted fields, and multiline values correctly.