JSON Crack
What JSON Crack is
JSON Crack is a free online tool for turning JSON, YAML, CSV, and XML into graph or tree views. You can enter data in its editor, upload a JSON file, or provide a URL. It also converts between formats, formats JSON, and validates JSON, YAML, and CSV. For development work, it can generate TypeScript interfaces, Go structs, Rust serde, and JSON Schema. Schema tools validate JSON Schema, create mock data, and generate schemas from JSON, YAML, XML, and CSV.
Other tools 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 brings visualization into the editor. Developers can embed the tool with an iframe, postMessage API, or jsoncrack-react package. The maker says editor data is processed in the browser and not stored on its servers. Its privacy policy also allows usage-data and cookie collection and possible Google Analytics use. The stated capacity is approximately 300 KB, depending on data complexity and hardware.
Who it suits
JSON Crack suits developers, data analysts, and others working with structured data who want to inspect, convert, validate, or query it. Its VS Code extension and embedding options may also suit people who need visualization in an editor or another application.
What it does well
- Visualizes JSON, YAML, CSV, and XML
- Generates code types and JSON Schema
- Includes jq and JSONPath tools
- Exports graphs as PNG, JPEG, or SVG
- Editor data is processed in the browser
What to know first
- Capacity is approximately 300 KB and varies
- Privacy policy allows usage-data and cookie collection
- Premium features moved to ToDiagram.com
Limits
The maker says JSON Crack supports approximately 300 KB, with the limit varying by data complexity and hardware. Premium features have moved to ToDiagram.com.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | free-forever open-source online tool · approximately 300 KB, depending on data complexity and hardware | Free |
As jsoncrack.com lists them, read 4 Oct 2026. The maker's own page has the final word.
Getting started
- Open JSON Crack in a browser.
- Enter data in the editor, upload a JSON file, or provide a URL.
- Choose a graph or tree view for the structured data.
- Use conversion, formatting, validation, schema, or query tools as needed.
- Export a graph image as PNG, JPEG, or SVG, or use the VS Code extension or an embedding option.
Verdict
JSON Crack brings data visualization, conversion, validation, and query tools together in a free online viewer. Check its approximate size capacity and privacy terms before using it for a particular dataset.
Questions
How much does JSON Crack cost?
The Free plan is listed as free.
What data formats does it support?
It visualizes JSON, YAML, CSV, and XML. It can convert between formats and validates JSON, YAML, and CSV.
Is there a size limit?
The maker says it supports approximately 300 KB. The limit varies with data complexity and hardware.
Does JSON Crack have a VS Code extension?
Yes. The extension lets users visualize JSON directly in the editor.
Can developers embed JSON Crack?
Yes. Embedding options include an iframe widget, a postMessage API, and the jsoncrack-react package.
Where are the premium features?
The maker says premium features moved to ToDiagram.com. Prior subscribers can use the same credentials there.
Facts from JSON Crack's own pages
- Advanced tools
- It includes JWT decoding, data randomization, jq execution, and JSONPath commands. · jsoncrack.com, 4 Oct 2026
- Audience
- The maker describes the tool as suitable for developers, data analysts, and others working with structured data. · jsoncrack.com, 4 Oct 2026
- Code generation
- It can generate TypeScript interfaces, Go structs, Rust serde, and JSON Schema. · jsoncrack.com, 4 Oct 2026
- Conversion
- The tool converts between formats, including JSON to CSV, YAML to JSON, and XML to JSON. · jsoncrack.com, 4 Oct 2026
- Data handling
- The maker says editor data is processed in the browser and is not stored on its servers. · jsoncrack.com, 4 Oct 2026
- Data size
- The maker says it supports approximately 300 KB, with the limit varying by data complexity and hardware. · jsoncrack.com, 4 Oct 2026
- Export
- Users can export graph images as PNG, JPEG, or SVG. · jsoncrack.com, 4 Oct 2026
- Formatting and validation
- It formats JSON and validates JSON, YAML, and CSV. · jsoncrack.com, 4 Oct 2026
- Input
- Users can upload a JSON file, provide a URL, or enter data in the editor. · jsoncrack.com, 4 Oct 2026
- Integration
- Developers can embed JSON Crack using an iframe widget, a postMessage API, or the jsoncrack-react package. · jsoncrack.com, 4 Oct 2026
- Premium features
- The maker says premium features moved to ToDiagram.com, where prior subscribers can use the same credentials. · jsoncrack.com, 4 Oct 2026
- Privacy
- The privacy policy says the service may collect usage data and use cookies, and may use Google Analytics. · jsoncrack.com, 4 Oct 2026
- Product
- JSON Crack is an online viewer that visualizes JSON, YAML, CSV, and XML data as graphs or trees. · jsoncrack.com, 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, 4 Oct 2026
- VS Code
- A VS Code extension lets users visualize JSON directly in the editor. · jsoncrack.com, 4 Oct 2026
Where JSON Crack stands on Freedom251
- JSON Tools#13 of 29