Private JSON Formatter & Data Converter
Beautify, validate, minify, and inspect JSON with an interactive tree viewer. Convert bidirectional JSON ⇄ CSV. Never upload proprietary API payloads or customer records to remote servers — 100% client-side.
{
"orderId": "ORD-2026-8819",
"createdAt": "2026-10-10T14:20:15Z",
"customer": {
"id": "cust_3391",
"firstName": "Sarah",
"lastName": "Connor",
"vipMember": true
},
"shippingAddress": {
"street": "742 Evergreen Terrace",
"city": "Springfield",
"state": "OR",
"zipCode": "97477",
"country": "USA"
},
"items": [
{
"sku": "PROD-MECH-KB",
"name": "Wireless Mechanical Keyboard",
"quantity": 1,
"unitPrice": 129.99
},
{
"sku": "PROD-USB-CABLE",
"name": "Braided USB-C Cable (2m)",
"quantity": 2,
"unitPrice": 14.5
}
],
"payment": {
"method": "Apple Pay",
"subtotal": 158.99,
"tax": 12.72,
"shippingFee": 0,
"total": 171.71,
"currency": "USD",
"paid": true
}
}Why In-Browser JSON Formatting Matters for Developer Privacy
Software engineers, analysts, and QA teams regularly paste database dumps, customer records, JWT payloads, and proprietary API keys into online formatters. Traditional cloud-based tools send your raw text to remote web servers, creating serious data leakage risks. LensText processes all JSON and CSV operations entirely in your local browser runtime using native JavaScript engines.
How to Use
- Paste your raw JSON text or drag-and-drop a .json or .csv file into the input editor.
- Choose your preferred view mode: Prettify (2 spaces), Prettify (4 spaces), Minify (compact single-line), or Visual Tree Inspector.
- Review instant syntax validation highlighting the exact line and column numbers of any errors.
- Switch to 'JSON ⇄ CSV' mode to instantly convert arrays of objects into structured CSV spreadsheets or reverse-convert CSV to JSON.
- Copy the result to your clipboard or download the formatted file with a single click.
Key Features & Benefits
- 100% Client-Side Privacy: Zero server uploads. Your confidential tokens, enterprise databases, and customer records remain strictly inside your browser's local sandbox.
- Interactive Visual Tree Inspector: Explore deep nested objects and arrays with collapsible nodes, data type color coding, search filters, and one-click JSON path copying.
- Precise Error Detection: Instantly pinpoint syntax mistakes with clear error banners displaying the exact line and column coordinates of malformed tokens.
- Bidirectional JSON ⇄ CSV Conversion: Convert arrays of nested objects into flattened spreadsheet-ready CSV tables, or import CSV files and generate clean JSON.
Frequently Asked Questions
Is my JSON data uploaded or logged anywhere?
No. All parsing, validation, formatting, and CSV transformations occur 100% locally on your computer using client-side JavaScript. LensText never transmits, logs, or stores your data on any server.
Can I format large JSON files?
Yes! Because processing relies directly on your machine's CPU and memory rather than internet bandwidth, you can format, inspect, and minify large payloads without network timeouts.
How does the syntax error detection work?
The tool validates your JSON in real-time as you type, parsing token positions and surfacing friendly messages with exact line and column locations to help you fix syntax errors quickly.
How does JSON to CSV conversion handle nested objects?
Our converter flattens nested properties into dot-notation columns (e.g. `user.address.city`), making them clean, readable, and easily importable into Microsoft Excel or Google Sheets.