Free Online JSON, XML, and CSV Converter Tool
QueryJSON is the best free online tool for converting, querying, and analyzing structured data. Whether you need a JSON viewer, XML to JSON converter, or CSV parser, QueryJSON handles it all in your browser without uploading data to any server.
Key Features of QueryJSON
- JSON Viewer and Formatter: Parse, validate, and view JSON data in an interactive table format
- XML to JSON Converter: Automatically convert XML data to JSON with proper structure preservation
- CSV to JSON Converter: Transform CSV files into JSON format with automatic delimiter detection
- SQL Query Tool: Run PostgreSQL queries on your data using PGLite (PostgreSQL in the browser)
- JSONPath Query Support: Query nested JSON structures using JSONPath expressions
- Data Filtering: Apply multiple filters with various operators (equals, contains, greater than, etc.)
- Column Management: Select, reorder, and customize which columns to display
- Export & Copy: Download as CSV/JSON or copy as JSON/Markdown to clipboard
- 100% Client-Side: All processing happens in your browser - no data sent to servers
- Free and Open Source: MIT licensed, completely free to use forever
How to Use QueryJSON
- Paste or upload your JSON, XML, or CSV data
- Click Parse to process your data
- Select columns to display and apply filters as needed
- Run SQL or JSONPath queries for advanced analysis
- Export filtered results in your preferred format
Why Choose QueryJSON?
Privacy First: Unlike other online converters, QueryJSON processes all data entirely in your browser. Your sensitive data never leaves your computer, making it perfect for confidential information.
No Sign-Up Required: Start using QueryJSON immediately without creating an account or providing any personal information.
Developer Friendly: Built by developers for developers. Support for SQL queries, JSONPath, and multiple data formats makes it the perfect tool for data analysis and debugging.
Fast and Efficient: Handle thousands of rows efficiently with our optimized data processing engine.
Common Use Cases
- Convert API responses from JSON to table format for easier reading
- Transform XML data from legacy systems to JSON for modern applications
- Parse and analyze CSV exports from databases or spreadsheets
- Debug JSON data structures with the interactive viewer
- Run SQL queries on JSON data without setting up a database
- Filter and export specific data subsets from large datasets
- Validate JSON syntax and structure
- Convert between data formats for data migration projects
Supported Data Formats
JSON (JavaScript Object Notation)
QueryJSON supports all valid JSON formats including nested objects, arrays, and complex data structures. Use our JSON viewer to visualize and query your data.
XML (Extensible Markup Language)
Convert XML to JSON automatically. Our parser handles XML attributes, nested elements, and converts them to a clean JSON structure.
CSV (Comma-Separated Values)
Import CSV files with automatic delimiter detection (comma, semicolon, or tab). The first row is treated as headers, and numeric values are automatically typed.
Advanced Features
SQL Queries with PostgreSQL
Run full PostgreSQL queries on your data using PGLite. Your data is loaded into a table called 'json_data' where you can perform SELECT, WHERE, JOIN, GROUP BY, and other SQL operations.
JSONPath Queries
Navigate complex JSON structures using JSONPath expressions. Perfect for extracting specific values from nested objects and arrays.
Interactive Filtering
Apply multiple filters simultaneously with operators including equals, not equals, contains, starts with, ends with, greater than, less than, is null, and is not null.
Browser Compatibility
QueryJSON works on all modern browsers including Chrome, Firefox, Safari, and Edge. JavaScript must be enabled for the application to function.
Open Source and Free
QueryJSON is open-source software released under the MIT License. You can view the source code, contribute improvements, or report issues on GitHub.
Data Security and Privacy
Your data security is our top priority. QueryJSON is a 100% client-side application that processes all data in your browser's memory. No data is uploaded to any server, stored in any database, or transmitted over the internet. When you close your browser tab, all data is completely removed.
Performance
QueryJSON can efficiently handle datasets with thousands of rows. Performance depends on your device's memory and processing power. For very large datasets (100,000+ rows), processing time may vary.
Keywords
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QueryJSON