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JSON Crack
What it is
JSON Crack is a free online viewer that turns JSON, YAML, CSV and XML data into graph or tree visualizations. Users can enter data in an editor, upload a JSON file or provide a URL. The tool converts between formats, formats JSON, and validates JSON, YAML and CSV. It can generate TypeScript interfaces, Go structs, Rust serde and JSON Schema; schema tools also validate schemas, create mock data and generate schemas from supported data formats. Other utilities include JWT decoding, data randomization, jq execution and JSONPath commands. Graph images can be exported as PNG, JPEG or SVG, and a VS Code extension supports JSON visualization in the editor. Developers can embed it using an iframe widget, postMessage API or jsoncrack-react package. The maker says editor data is processed in the browser and not stored on its servers, while the privacy policy permits usage-data and cookie collection and possible Google Analytics use. The stated capacity is approximately 300 KB, varying with data complexity and hardware.
For and against
For
- Visualizes JSON, YAML, CSV and XML.
- Includes format conversion and validation tools.
- Exports graphs as PNG, JPEG or SVG.
- Free online tool.
Against
- Capacity is approximately 300 KB.
- Capacity varies with data complexity and hardware.
- Privacy policy allows usage-data and cookie collection.
The verdict
JSON Crack combines visualizations with conversion, validation and schema utilities in a free web tool. Keep its approximate data capacity and stated privacy practices in mind when choosing it.
Who it suits
JSON Crack suits developers, data analysts and others working with structured data who want to inspect, convert or validate it. The VS Code extension and embedding options may suit users incorporating visualization into their workflow.
Plans and prices
Free
free-forever open-source online tool · approximately 300 KB, depending on data complexity and hardware
Read 4 Oct 2026 · jsoncrack.com
On the record
- Advanced tools
- It includes JWT decoding, data randomization, jq execution, and JSONPath commands.jsoncrack.com · read 4 Oct 2026
- Audience
- The maker describes the tool as suitable for developers, data analysts, and others working with structured data.jsoncrack.com · read 4 Oct 2026
- Code generation
- It can generate TypeScript interfaces, Go structs, Rust serde, and JSON Schema.jsoncrack.com · read 4 Oct 2026
- Conversion
- The tool converts between formats, including JSON to CSV, YAML to JSON, and XML to JSON.jsoncrack.com · read 4 Oct 2026
- Data handling
- The maker says editor data is processed in the browser and is not stored on its servers.jsoncrack.com · read 4 Oct 2026
- Data size
- The maker says it supports approximately 300 KB, with the limit varying by data complexity and hardware.jsoncrack.com · read 4 Oct 2026
- Export
- Users can export graph images as PNG, JPEG, or SVG.jsoncrack.com · read 4 Oct 2026
- Formatting and validation
- It formats JSON and validates JSON, YAML, and CSV.jsoncrack.com · read 4 Oct 2026
- Input
- Users can upload a JSON file, provide a URL, or enter data in the editor.jsoncrack.com · read 4 Oct 2026
- Integration
- Developers can embed JSON Crack using an iframe widget, a postMessage API, or the jsoncrack-react package.jsoncrack.com · read 4 Oct 2026
- Premium features
- The maker says premium features moved to ToDiagram.com, where prior subscribers can use the same credentials.jsoncrack.com · read 4 Oct 2026
- Privacy
- The privacy policy says the service may collect usage data and use cookies, and may use Google Analytics.jsoncrack.com · read 4 Oct 2026
- Product
- JSON Crack is an online viewer that visualizes JSON, YAML, CSV, and XML data as graphs or trees.jsoncrack.com · read 4 Oct 2026
- Schema tools
- Its schema tools validate JSON Schema, create mock data, and generate schemas from JSON, YAML, XML, and CSV.jsoncrack.com · read 4 Oct 2026
- VS Code
- A VS Code extension lets users visualize JSON directly in the editor.jsoncrack.com · read 4 Oct 2026
