Free Online JSON Toolkit
Format, validate, inspect, and convert JSON, XML, CSV, and Excel workbooks directly inside your browser. No signups, no rate limits, and zero server uploads.
JSON Formatter & Validator
Format, beautify, minify, and validate JSON data online with detailed syntax error detection and key sorting.
- ✓Beautify with 2, 3, 4, 8 spaces or tab indentation
- ✓Alphabetical object key sorter (A-Z)
- ✓Minify / compact JSON into single line
XML to JSON Converter
Convert XML code or uploaded XML files into clean, structured JSON with attributes and namespaces preserved.
- ✓Paste XML or upload .xml files up to 5MB
- ✓Preserves attributes with clean @attr naming
- ✓Collates repeated child tags into arrays
XML to CSV Converter
Transform structured XML records into clean CSV spreadsheets with interactive table preview.
- ✓Auto-detects repeated record candidate elements
- ✓Flattens nested elements and attributes into headers
- ✓Interactive paginated table preview before download
JSON to Excel Converter
Convert JSON arrays and objects into real Microsoft Excel (.xlsx) spreadsheets, tables, or CSV files.
- ✓Generates real Microsoft Excel .xlsx files
- ✓Interactive JSON to table preview grid
- ✓CSV download fallback included
JSON File Viewer
Open and inspect JSON files in an interactive collapsible tree view with search, types, and path inspection.
- ✓Upload .json or .jsonl files or paste raw JSON text
- ✓Collapsible interactive tree hierarchy
- ✓Data type badges (string, number, boolean, object, array, null)
XLSX to CSV Converter
Convert modern Excel (.xlsx) workbooks to CSV format. Choose sheets, preview, or export all sheets in a ZIP.
- ✓Read modern Excel (.xlsx) files directly in browser
- ✓Select any worksheet from multi-sheet workbooks
- ✓Interactive preview table for the chosen sheet
HTML Decoder & Encoder
Decode HTML entities into readable plain text or encode special characters into safe HTML entities.
- ✓Two-way conversion: Decode entities or Encode text
- ✓Supports 250+ named entities, decimal, and hex formats
- ✓Displays decoded text safely without executing HTML/JS
JavaScript Object Notation Guide
The complete guide to JavaScript Object Notation (JSON): syntax rules, creating JSON files, valid types, and formatting.
- ✓What JSON stands for and why it became the web standard
- ✓Step-by-step instructions on creating a JSON file
- ✓The 6 primitive & compound data types supported by JSON
Why In-Browser Processing Matters for Developers
Most online formatters and converters silently transmit your data to remote backend servers or third-party AI APIs. Here is how our architecture protects you:
Zero Remote Transmission
JSON parsing, XML traversal, Excel decompression, and HTML entity decoding execute entirely within your browser runtime. If you disconnect your internet, the tools will continue functioning normally.
No AI API Logging
We deliberately do not route data through LLM APIs (such as OpenAI, Gemini, or Claude). Your proprietary schemas, customer databases, and API keys are never ingested for model training.
Sanitized File Exports
Our CSV and Excel generators neutralize malicious formula injection attacks (DDE), while our XML engine disables external entity expansion (XXE) and external DTD fetching by design.
Common Tasks & Quick-Start Workflows
Jump straight into the exact tool configured for your workflow:
Clean & Debug Minified API Responses
Paste minified JSON from curl or Postman to format with 2-space indentation and pinpoint syntax errors.
Migrate Legacy SOAP or RSS Feeds to JSON
Upload XML feeds and automatically preserve attributes, namespaces, and repeated tags as arrays.
Export Database Records to Excel (.xlsx)
Turn MongoDB or Supabase JSON arrays into genuine formatted Microsoft Excel workbooks for stakeholders.
Bulk Convert Multi-Sheet Workbooks to CSV
Convert complex Excel workbooks into CSV files with one-click multi-tab ZIP export for data pipelines.
Convert XML Feeds to Tabular CSV
Transform repeating XML tags and nodes into standard CSV spreadsheets with real-time table preview.
Inspect JSON in Interactive Tree Viewer
Visualize complex JSON hierarchies, collapse nested nodes, filter paths, and search object properties.
Decode Escaped HTML Entities & Text
Cleanly decode named, decimal, and hex HTML entities into readable UTF-8 text with instant copy.
Comprehensive JSON Specification Guide
Master JSON syntax rules, RFC 8259 specs, data types, security principles, and parser best practices.
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Frequently Asked Questions About the JSON Toolkit
- What is the AI Digital Genius JSON Toolkit?
- The JSON Toolkit is a unified suite of free, client-side developer utilities designed for formatting, validating, exploring, and converting structured data formats including JSON, XML, CSV, and Microsoft Excel (.xlsx) workbooks.
- Are my JSON or XML files uploaded to an external server?
- No. Every tool in this toolkit runs 100% locally in your browser memory via native JavaScript and Web APIs. Your confidential files, sensitive database dumps, and API keys are never uploaded, logged, or sent to any server.
- Do any of these tools use paid AI APIs (like Gemini, OpenAI, or Claude)?
- No. All formatting, syntax parsing, tree building, and spreadsheet conversions are performed deterministically in your browser without any remote AI API calls. The tools are completely free with zero usage caps.
- Can I use these tools on mobile devices?
- Yes! The JSON Toolkit is fully responsive across desktop, tablet, and smartphone viewports with touch-friendly editors, pagination, and tree expanders.
- How do I report a bug or request an additional conversion tool?
- You can reach out through our contact page or suggestion channels. We actively expand our developer utility offerings based on user feedback.