CSV to JSON Converter
Converted JSON will appear here…
Migrating spreadsheet tables into application code or database records requires a reliable data transformer. Our csv to json converter tool turns tabular data from Excel or text files into structured JSON arrays of objects instantly. Featuring automatic delimiter detection, intelligent data type coercion for numbers and booleans, and clean RFC 4180 parsing, this csv to json online free utility processes datasets entirely inside your web browser. Developers can easily prepare mock API responses or convert via command line workflows while guaranteeing that sensitive financial or operational records remain completely private.
Guide
About CSV to JSON Conversion
What is the output format?
The result is a JSON array of objects. Each CSV row becomes one object, and each column header becomes a key. This is the most common format accepted by REST APIs, JavaScript applications, and databases expecting structured records.
Does this handle fields with commas inside them?
Yes. The parser is fully RFC 4180 compliant. Fields wrapped in double quotes can contain commas, newlines, or double quotes (represented as ""). For example, "Smith, John" is treated as a single field value, not two columns.
What does type coercion do?
CSV stores all values as strings. When coercion is on, "30" becomes the number 30, "true" becomes boolean true, and blank cells or "null" become JSON null. Turn it off to keep all values as raw strings.
How is the delimiter auto-detected?
The tool scans the first line of the CSV and counts occurrences of comma, semicolon, and tab. The most frequent character is selected as the delimiter. This identifies the correct delimiter for over 95% of standard CSV and TSV exports from Excel, Google Sheets, and database tools.
CSV (Comma-Separated Values) is the universal data exchange format for spreadsheets and databases, while JSON is the standard for APIs and modern web applications. Converting between the two is a daily task for developers, data analysts, and anyone integrating spreadsheet data with a backend or third-party service.
This tool parses your CSV in three steps. First, it auto-detects the delimiter by counting candidate characters on the first line — so whether your file uses commas, semicolons, or tabs, it works without configuration. Second, it tokenises each row following RFC 4180 rules: quoted fields (which may contain commas or newlines) are handled correctly. Third, with type coercion enabled, string representations of numbers ("1234.5"), booleans ("true"/"false"), and null-like values are automatically converted to their native JSON types — making the output immediately usable without a post-processing step.
Worked example: Paste three-line CSV — name,age,active\nAlice,30,true\nBob,25,false — with type coercion on. The output is a JSON array of two objects: {"name":"Alice","age":30,"active":true} and {"name":"Bob","age":25,"active":false}. The age and active fields are native JSON types, not quoted strings — ready to pass directly to a REST API body.
The interactive preview table shows the first 10 rows of parsed data so you can verify the structure before downloading. After conversion, use the JSON Formatter to prettify and inspect the output, or the JSON Tree Viewer to navigate it as a collapsible tree.
CSV to JSON vs JSON to CSV — which converter do you need?
The two converters are inverses of each other and serve opposite workflows. Use CSV to JSON (this page) when you're importing data from a spreadsheet, Google Sheets export, or database dump into a JavaScript application, REST API, or NoSQL store. Use the JSON to CSV Converter when you're exporting API response data to a spreadsheet for analysis, sharing with a non-developer, or importing into a SQL database via a CSV import wizard. A common round-trip workflow: export a CSV from a database, convert it to JSON here, process it with an API, then convert the updated API response back to CSV for a report.
After converting, validate the JSON output using the JSON Validator to confirm it's well-formed before sending it to an API. For large converted files, use the JSON Minifier to reduce payload size before transmission.