CSV to JSON Converter
Convert CSV files to JSON
Click to upload CSV file or paste below
About CSV to JSON Converter
CSV to JSON Converter is a free online tool that transforms CSV (Comma-Separated Values) data into JSON (JavaScript Object Notation) format instantly. Paste your CSV content or upload a file — the tool outputs a clean JSON array with each row as an object and column headers as keys.
CSV and JSON are the two most widely used data interchange formats in web development and data work. CSV is the universal format for tabular data — spreadsheets, database exports, reports, analytics data, and financial records all ship as CSV. JSON is the universal format for APIs, configuration files, and NoSQL databases. Converting between them is one of the most common tasks for developers, data analysts, and anyone integrating systems.
The conversion logic is straightforward: the first row of a CSV file is treated as the header row, and each subsequent row becomes a JSON object with the header values as keys. A CSV with columns "name,age,city" and a row "Alice,30,Mumbai" becomes {"name":"Alice","age":"30","city":"Mumbai"}. The full file becomes a JSON array of such objects. The converter also handles quoted fields (allowing commas inside values), escaped quotes, and various delimiter variants.
Common use cases include preparing data for a REST API that expects JSON input, converting spreadsheet exports for import into MongoDB or Firebase, feeding CSV analytics data into a JavaScript charting library, or migrating data between systems with different format requirements. The browser-based conversion means no data ever leaves your device — essential for processing sensitive business data.
How to Use CSV to JSON Converter
- 1Paste your CSV data into the input field or upload a .csv file
- 2Ensure the first row contains your column headers
- 3Click "Convert" to transform the CSV to JSON
- 4Review the JSON array output
- 5Copy the JSON or download it as a .json file
Frequently Asked Questions
Yes. Properly quoted CSV fields (e.g. "Smith, John") containing commas are parsed correctly and the comma is treated as part of the value, not as a delimiter.
Comma (,) is the default and most common delimiter. The tool also supports tab-delimited (TSV) and semicolon-delimited files, which are common in European locales where commas are used as decimal separators.
By default, all values from CSV are strings in JSON. You can enable auto-type detection to have numeric-looking values output as JSON numbers and true/false values as booleans.
The tool processes files in the browser using JavaScript, so it can handle files up to several MB without issues. Very large files (50 MB+) may be slow depending on your device.
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