CSV to JSON Converter: Convert CSV to JSON Online | Free Tool

A Yes, numbers and booleans are automatically detected and converted to proper JSON types instead of strings.

A Yes, completely free. No registration, no file size limits for browser-based processing.

A Our CSV to JSON converter is designed to automatically detect common delimiters, including commas, semicolons, and tabs. If the auto-detection isn't perfect for your specific data, you can easily select the correct separator from a dropdown menu. This ensures your CSV is parsed accurately, converting it into valid JSON format without errors, regardless of the original delimiter.

A Absolutely. Our CSV to JSON converter processes all your data directly within your web browser. This means your CSV content never leaves your computer and is never uploaded to our servers. Your information remains completely private and secure throughout the conversion process, ensuring confidentiality for your sensitive data.

A Yes, our CSV to JSON converter is designed to produce a standard JSON array of objects. Each row in your CSV data will be represented as a distinct JSON object within the array, with the CSV headers serving as the keys for each property. This format is widely compatible for API integrations, data exchange, and web applications, making your converted data easy to consume.

A This tool flattens nested structures by default. If your CSV has columns like "items[0].name", you'll get JSON keys with those exact bracket notations. For proper nested JSON, you'd need a multi-step pipeline. Try converting your CSV to a flat JSON first, then restructure it with a tool like jq. Most real-world CSVs with simple headers work perfectly.

A Our converter handles mismatched rows gracefully. Extra columns without headers get assigned generic keys like "column_4" or "field_5". Missing values become null in JSON. Test this with a 3-header CSV containing 5 data columns — you'll see the pattern instantly. For clean output, always match your header count to data columns.

A Yes, missing values become null in the JSON output. For example, a row with 'name,age,city' and 'Alice,,NYC' turns into {"name":"Alice","age":null,"city":"NYC"}. Empty strings in quoted fields like "" stay as empty strings, not null. This matches standard JSON behavior for APIs. Check your data for unintended blanks before converting.

A Yes, the converter fully supports UTF-8 encoding. Paste CSV data with Japanese, Chinese, or accented characters and they'll appear correctly in JSON output. For example, a header like '名前' converts to that exact Japanese key. Test it with a row containing 'café' — the é stays intact. If you copy from Excel on Windows, watch out for BOM characters; trim your data if you see unexpected symbols.

A Our converter does that automatically. The JSON appears in a readable, indented format with proper line breaks after each object. Copy the output and paste it into any editor — you'll see clean structure, not a wall of text. If you're feeding this into an API or script, we also expose a compact mode toggle at the bottom of the output panel. Toggle it on for minified JSON, off for pretty-printed. Handy for QA testers who need to compare payloads visually.