CSV to JSON Converter
Convert CSV to JSON online free. Supports custom delimiters, header-based objects, auto type detection. All processing in browser.
How does CSV to JSON conversion work?
Each CSV row becomes a JSON object (with headers as keys) or a JSON array (without headers). Quoted fields are properly handled and types can be auto-detected.
Is my data safe?
Yes. All processing happens entirely in your browser. No data is uploaded to any server, ensuring complete privacy.
What delimiters are supported?
Comma (default), tab, semicolon, pipe, and custom character. You can also use the auto-detect delimiter feature.
How does the "Use first row as headers" option work?
When enabled, the first row of the CSV is used as property names for each JSON object. When disabled, each row is converted into a JSON array.
What does "Auto-detect types" do?
It converts numeric strings to numbers, "true"/"false" to booleans, and empty values to null. Disable it to keep all values as strings.
What is the maximum file size?
Since the conversion runs entirely in the browser, file size is limited by available memory. For very large CSV files, batch processing is recommended.
What's the difference between array and object output?
Array mode converts each row into an element of a JSON array. Object mode uses headers as keys to convert each row into a JSON object.
Does it support special characters and encoding?
Yes. The tool supports UTF-8 by default and correctly handles multilingual characters such as Chinese, Japanese, Arabic, and special symbols.
How are quoted fields handled?
Quoted fields are processed according to the RFC 4180 standard, supporting nested quotes and line breaks within fields.
Is this tool free to use?
Yes, this tool is completely free. No registration is required and there are no hidden fees.
Can I use it on my phone?
Yes. The tool features a responsive design and works on mobile browsers, tablets, and desktop browsers.
Can I import the JSON into a database?
Yes. The converted JSON can be directly imported into MongoDB and other database systems that support JSON import.
How to Use CSV to JSON Converter
Convert CSV rows into JSON objects or arrays with custom delimiters and automatic type detection. Parsing happens entirely in your browser and nothing is uploaded.
- Paste your CSV into the input area.
- Under 'Delimiter:', select the separator your file uses: comma, semicolon, 'Tab' or pipe '|'.
- Tick 'Use headers' so each row becomes an object whose keys come from the first row.
- Tick 'Auto-detect types' to emit numbers and booleans as real JSON types instead of strings.
- Tick 'Skip empty lines' to drop blank rows, then copy the JSON from the output area.
With 'Auto-detect types' on, a zip code like 01234 loses its leading zero — untick it when fields must stay strings.
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