CSV → JSON Converter
Convert CSV to JSON Online
Transform CSV files into JSON format with Convert Buddy's streaming conversion engine. Process massive CSV files directly in your browser without uploads or memory limits. Powered by Rust + WebAssembly for maximum performance.
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Browser-based — no server uploads
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Streaming parser for large files
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Auto-detects CSV delimiters
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Real-time performance metrics
Start Converting CSV to JSON
No registration required. Files processed locally in your browser.
Command Center
Detect → schema → convert
Drop a file and watch Convert Buddy detect structure, preview fields, and convert instantly.
Drop a file to detect + convert
Supported formats: CSV, JSON, NDJSON, XML
Detection status
IdleFormat: csv
Structure: Awaiting detection.
Fields: 0
Estimated records: —
Input: Awaiting file
Output format
Choose your destination format.
Performance telemetry
LiveThroughput
0.0 MB/s
Records/sec
0
Records processed
0
Elapsed
00:00
Bytes in/out
0.0 MB / 0.0 MB
Output
Output will appear here after conversion completes.
Format: csv → json
Output files are UTF-8 text. JSON output is intentionally minified for streaming performance, so it may open as a single line until you run your editor's format command.
Frequently Asked Questions
How do I convert CSV to JSON?
Simply drop your CSV file into the converter above, and Convert Buddy will automatically detect the delimiter and column structure. The CSV rows are streamed and converted into JSON objects. You can download the result as a JSON array or NDJSON stream.
Can I convert large CSV files to JSON?
Yes. Convert Buddy uses streaming parsing to handle CSV files of any size, including multi-GB files. The conversion happens in chunks, so your browser never runs out of memory. We show real-time progress and throughput during conversion.
What CSV formats are supported?
Convert Buddy auto-detects common CSV dialects including comma, semicolon, tab, and pipe delimiters. It also handles quoted fields, escaped characters, and various line endings (LF, CRLF). Custom delimiters can be specified manually.
Is the converted JSON downloadable?
Yes. After conversion completes, you can download the full JSON output or copy it to your clipboard. For very large outputs (>100MB), the file is automatically downloaded to prevent browser slowdowns.
Why use Convert Buddy instead of online CSV converters?
Most online converters upload your files to their servers, have size limits, and can be slow. Convert Buddy runs entirely in your browser using WebAssembly, so your data never leaves your device, there are no file size limits, and conversion is typically faster.
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