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Free online CSV to JSON converter. Convert CSV data to JSON format and JSON arrays to CSV. Perfect for data migration and API testing.
CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data formats used in software development. CSV is the standard format for spreadsheets and database exports, while JSON is the universal format for web APIs and configuration files. Converting between the two is a frequent task in data processing, migration, and API integration.
CSV format uses commas (or other delimiters) to separate values in a tabular structure. The first row typically contains headers that define column names. Each subsequent row represents a single record. Despite its simplicity, CSV has no standard specification — different systems may use different delimiters, quoting rules, or encoding, which can cause compatibility issues.
JSON represents data as structured objects and arrays, making it ideal for hierarchical data that doesn't fit naturally into a flat table. Converting CSV to JSON creates an array of objects where each row becomes an object keyed by the header names. Converting JSON to CSV flattens objects into rows, which works well for simple flat data structures.
Common use cases for CSV↔JSON conversion include: importing spreadsheet data into a web application, exporting API responses to Excel, migrating data between databases, preparing test data for API development, and transforming legacy CSV exports into modern JSON formats for further processing.
This converter uses simple, transparent parsing logic. For CSV input, the first row is treated as headers. All rows must have the same number of columns. For JSON input, the input must be an array of objects with consistent keys. For complex CSV files with quoted fields, newlines within fields, or varying numbers of columns, a more sophisticated CSV parser may be needed.
This tool uses commas as the delimiter. Some CSV files use tabs (TSV), semicolons, or pipes. For non-comma delimiters, you can use a text editor to replace the delimiter with a comma before converting.
CSV is a flat format and cannot represent nested objects or arrays. When converting JSON to CSV, nested structures are converted to their string representation. For deeply nested data, consider converting individual nested objects to separate CSV files.
Common issues include: (1) values containing commas — these should be quoted in CSV, (2) inconsistent number of columns across rows, (3) header row missing or with unexpected column names, and (4) encoding issues with non-ASCII characters. Ensure your CSV follows standard formatting.