Paste CSV or TSV data, or drag and drop a file, and convert it to clean JSON instantly. Choose between array-of-objects and array-of-arrays output, toggle pretty-print or minified formatting, and download or copy the result. Everything runs locally in your browser.
Drag & drop a .csv or .tsv file here, or browse to upload
Supports .csv, .tsv, and .txt files up to 50 MB
CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data formats used in software development, data analysis, and system integrations. CSV files are simple, tabular, and widely supported by spreadsheet applications like Excel and Google Sheets. JSON, on the other hand, is the standard data format for web APIs, configuration files, and modern databases like MongoDB and Firebase.
Converting CSV to JSON is a frequent task when migrating data between systems, preparing API payloads, or loading tabular data into a JavaScript application. This converter handles the process in your browser with zero dependencies and zero server calls.
For the cleanest conversion, make sure your CSV follows these guidelines:
"San Francisco, CA"."She said ""hello""" becomes She said "hello" in the output.first_name or orderTotal work better than Column A.This converter supports two output shapes. "Array of objects" maps each row to a JSON object with named keys from the header row. This is the most common format for API payloads and database documents. "Array of arrays" outputs each row as a plain array of values with no keys, which is useful for lightweight data transport, charting libraries, or when column order matters more than column names. Choose the format that fits your downstream system.
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The parser follows RFC 4180 rules. Any field wrapped in double quotes is treated as a single value, even if it contains commas, tabs, or newline characters. A literal double quote inside a quoted field is represented by two double quotes in a row. For example, the CSV value "Hello, ""world""" converts to the JSON string "Hello, \"world\"".
Yes. The auto-detect feature analyzes the first few lines of your data and identifies whether it uses commas, tabs, semicolons, or pipes as the delimiter. Tab-separated files are detected automatically. You can also manually select "Tab (TSV)" from the delimiter dropdown if the auto-detection picks the wrong separator.
Array of objects uses the first row as keys and maps each subsequent row into a JSON object like {"name":"Alice","email":"alice@example.com"}. Array of arrays outputs each row as a plain list of values like ["Alice","alice@example.com"]. Objects are better for APIs and databases. Arrays are smaller in size and useful for charting libraries or when you only care about column position.
Yes. This tool runs entirely inside your browser using client-side JavaScript. Your CSV data never leaves your device. No network requests are made, nothing is uploaded to a server, and no data is logged or stored. You can verify this by opening your browser's developer tools and checking the Network tab during conversion.
Yes. When outputting as array of objects, the converter checks each value and stores it as a JSON number if it looks numeric, as a boolean for "true" and "false" strings, and as null for "null" strings. Everything else is stored as a string. This means a CSV value of 42 becomes the JSON number 42, not the string "42". Array-of-arrays mode keeps all values as strings.
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