Convert between CSV and JSON instantly — supports custom delimiters.
CSV to JSON Converter is a free online tool that converts between CSV and JSON formats instantly. Paste your data, select the conversion direction, and get perfectly formatted output with support for custom delimiters, headers, and automatic type detection. CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are the two most common data interchange formats. CSV is preferred for spreadsheets, databases, and tabular data exports. JSON is the standard for APIs, configuration files, and web applications. Converting between them is a frequent need in data processing workflows. The tool handles both directions: CSV to JSON creates an array of objects using the first row as property names, with automatic type detection for numbers and booleans. JSON to CSV extracts keys as column headers and handles nested values gracefully. Custom delimiters (comma, semicolon, tab, pipe) are supported for maximum flexibility. Everything runs entirely in your browser. Your data is never sent to any server, making it safe for converting sensitive datasets, customer records, and proprietary business data. There are no file size limits, no usage restrictions, and no account required. Common use cases include converting spreadsheet exports for API consumption, transforming API responses into spreadsheet format, preparing data for database imports, converting between formats for data analysis tools, and migrating data between systems.