JSON Crack
Open-source JSON viewer that turns JSON, YAML, XML, and CSV into interactive graph visualizations. All processing happens in the browser, so your data never leaves the machine.
Use Cases
Free Tier
Free forever and open source: unlimited graphs, client-side processing, ~300 KB data size limit, free VS Code extension. Premium features moved to ToDiagram.com.
How to Maximize the Free Tier
JSON Crack is free-forever open source — there is no paid tier on the core tool anymore (premium features moved to ToDiagram.com, which is where the pricing page now lives). The real constraint is data size: the FAQ says roughly 300 KB, so trim large payloads server-side or paste a representative slice instead of the full response. Because everything is processed client-side, you can safely visualize production JSON with secrets without worrying about a server storing it. Use the free VS Code extension to visualize JSON files directly in your editor, bypassing browser upload entirely. The graph view shines for nested webhook payloads and API responses — combine with Pipedream (already in the directory) to inspect step outputs visually. Export graphs as PNG/SVG for docs or GitHub issues; this works on the free tier.
Getting Started
Go to jsoncrack.com and open the editor (no signup needed) → paste JSON or drag-and-drop a file → the interactive graph renders instantly → click nodes to collapse/expand and use search to find keys → export as image or share a link. For editor workflow: install the free VS Code extension → open a .json file → run 'JSON Crack: Show Graph'.
Pros
- Free forever: Fully open source with no paid tier on the core tool — no trial, no feature-gated graphs
- Privacy by design: Data processed entirely in-browser, never uploaded to a server
- Multi-format: Visualizes JSON, YAML, XML, and CSV with JSON Schema generation and format conversion built in
Cons
- Size limit: ~300 KB practical cap — large production logs or DB dumps must be sampled first
- Premium migration: Advanced features (team workspaces, API) moved to ToDiagram.com, splitting the product
- Browser-only for sharing: Collaboration and hosted diagrams require the ToDiagram ecosystem, not the core tool