CSV to JSON Converter — Nested Mapping, Batch, No Upload

Convert CSV to JSON in your browser. Nested mapping, batch processing, smart type detection. No upload, 100% private.

Convert CSV files to JSON directly in your browser. No upload, no server, 100% private. Features nested JSON mapping, batch processing, and smart type detection. ★★★ KEY FEATURES ★★★ ▸ NESTED JSON MAPPING — Convert flat CSV columns into nested JSON objects using dot-notation. Map "address.city" to {"address": {"city": "..."}} automatically. No other CSV to JSON extension on the Chrome Web Store offers this. ▸ BATCH PROCESSING — Convert multiple CSV files at once. Download all results as a ZIP file or merge into a single JSON array. Perfect for processing multiple data exports simultaneously. ▸ 100% PRIVATE — All processing happens locally in your browser. Your CSV data never leaves your device. No upload, no server, no tracking. Works offline. ▸ SMART TYPE DETECTION — Automatically detects and converts numbers, booleans, and null values. Toggle type detection on or off. Manually set column types (string, number, boolean, null) for precise control. ▸ DELIMITER SUPPORT — Auto-detect or manually select: comma, tab, semicolon, or pipe delimiter. Handles quoted fields and escaped characters. ▸ PASTE OR DROP — Drag and drop CSV files, or paste CSV text directly. No file picker required. ★★★ HOW IT WORKS ★★★ 1. Click the extension icon to open the popup 2. Drop a CSV file (or paste CSV text) 3. Adjust settings: delimiter, header row, type detection 4. Set JSON paths for nested mapping (optional) 5. Click "Convert to JSON" 6. Copy to clipboard or download as .json file For batch mode: switch to the "Batch (ZIP)" tab, drop multiple CSV files, and convert all at once. ★★★ WHY CSV TO JSON? ★★★ CSV (Comma-Separated Values) is the standard export format for spreadsheets, databases, and analytics tools. JSON (JavaScript Object Notation) is the standard data format for APIs, web applications, and NoSQL databases. Converting CSV to JSON is essential for: • Developers integrating CSV data into APIs and web apps • Data analysts preparing data for MongoDB, Elasticsearch, or other NoSQL databases • Accountants converting spreadsheet exports for GST portal submission (GSTR-1, GSTR-3B formats) • Anyone who needs structured JSON from flat spreadsheet data ★★★ NESTED MAPPING EXAMPLE ★★★ CSV input: name, address.city, address.zip, items.0.title Alice, New York, 10001, Laptop JSON output with nested mapping: { "name": "Alice", "address": { "city": "New York", "zip": "10001" }, "items": [ { "title": "Laptop" } ] } ★★★ PRIVACY ★★★ This extension processes all data locally in your browser. No file content is ever sent to any server. No analytics, no tracking, no cookies. All code is bundled locally — no remote scripts. Full privacy policy: https://csv-to-json.com/privacy.html ★★★ FREE & PAID ★★★ • Free: 5 conversions (all features included) • Lifetime: $5 one-time payment for unlimited conversions • Pay on our website via crypto (USDT TRC-20) or card ★★★ LINKS ★★★ Website: https://csv-to-json.com Privacy Policy: https://csv-to-json.com/privacy.html Support: makszoom85@gmail.com Made with care for developers, analysts, and accountants who value privacy.