Free JSON Viewer — Open and Browse JSON Files Online

About the Free JSON Viewer

The FinancialDataTools.com JSON Viewer is a free, browser-based tool for opening, inspecting, and exporting JSON and JSON Lines files as a table. It runs entirely in your browser — no file is ever uploaded to any server.

Supported File Formats

Open any JSON file (.json) containing an array of objects, or a JSON Lines (.jsonl, .ndjson) file where each line is a separate JSON object. The viewer auto-detects the format. Nested objects within rows are flattened one level deep.

Key Features

Browse JSON data in a spreadsheet-style grid. Sort any column ascending or descending. Filter rows by value or custom conditions. Inspect cell values including nested JSON objects in the detail panel. Export data to CSV, JSON, TSV, or Excel (.xlsx).

Privacy and Security

All file processing happens inside your browser using JavaScript. No file content is transmitted to any server. Closing the browser tab clears all data immediately.

How to Use the JSON Viewer

Click the Open button or drag and drop your .json file. Your data appears as a table immediately. Sort columns by clicking headers. Filter by clicking column filter buttons. Click any cell to see the full value in the detail panel. Export using the Export button.

Use Cases for Financial Data

Inspect API response data from financial data providers. Browse transaction records exported as JSON. Analyze trading algorithm output. Review financial model results stored as JSON Lines. Convert JSON data to CSV or Excel for reporting.

Frequently Asked Questions

Is the JSON Viewer really free?

Yes, completely free with no signup required.

Does my JSON file get uploaded to a server?

No. All processing is local in your browser.

What JSON formats are supported?

Standard JSON arrays, JSON objects, and JSON Lines (.jsonl / .ndjson).

What happens with nested JSON objects?

Nested objects are shown as JSON strings. Click any cell to view the full formatted value in the detail panel.