{ } CSV to JSON

Convert CSV data to JSON format. Auto-detects delimiter and types. Nested object support. Free, private — all processed in your browser.

CSV Input (paste or drop file):

📁 Open CSV File

JSON Output:

Pretty print Infer types (numbers, booleans) Parse nested paths (a.b → object)

All processing in-browser · No upload to server · Your data stays private

About CSV to JSON Converter

Convert CSV data to JSON format. Auto-detects headers as keys, handles nested structures with dot notation. Perfect for importing spreadsheet data into APIs, databases, or JavaScript applications. All in your browser.

Header Detection

First row auto-detected as column headers. Option to specify custom headers or generate numbered keys.

Nested JSON

Dot-notation in headers (e.g. "address.city") creates nested JSON objects. Clean, structured output.

API-Ready Output

Output formatted as a JSON array of objects. Perfect for REST APIs, MongoDB imports, or config files.

Browser Privacy

CSV data processed locally. No server uploads — sensitive business data and customer lists stay private.

📋 Common Use Cases

Seeding Development Databases

Convert CSV test data into JSON arrays to feed into local databases or mock API responses during development.

Building Configuration from Spreadsheets

Turn a product catalog or user list maintained in Google Sheets into a JSON configuration file for a web application.

Preparing Data for Serverless Functions

Transform CSV exports into lightweight JSON payloads ready to be consumed by cloud functions, webhooks, or automation pipelines.

Creating Static Site Content

Convert a CSV of blog posts, team members, or FAQ items into structured JSON used by static site generators like Hugo or Jekyll.

🪜 How to Use This Tool

Upload or paste CSV data
Paste comma-separated text or upload a .csv file from your device.

Set the delimiter and headers
Choose whether the first row contains column headers and pick the delimiter character (comma, tab, pipe, or custom).

Customize output format
Choose between a compact array of objects or a prettified JSON structure with nested groupings.

Copy or download the JSON
Grab the generated JSON with one click or download it as a .json file ready for use.

Frequently Asked Questions

Is this data tool free?▼

Yes. All data tools are completely free. No signup needed.

Is my data sent to a server?▼

No. All data processing happens in your browser. Your JSON, CSV, SQL, and text data never leaves your device.

Can these handle large files?▼

JSON formatter and CSV tools comfortably handle files up to ~10MB in browser. Performance depends on your device for larger datasets.