FHIR JSON utility
FHIR JSON Formatter & Resource Viewer
Validate JSON syntax, inspect common FHIR resource details, explore Bundles, search paths, and check internal references without uploading the content.
Formatter and viewer
Paste a FHIR JSON resource or Bundle
The tool validates JSON structure and provides practical FHIR-aware summaries. It is not a certified FHIR validator and does not validate profiles or implementation guides.
The content stays in your browser and is not saved by this tool.
A collapsible JSON tree will appear here.
Formatted FHIR JSON will appear here.
Reference analysis will appear here.
Bundle explorer
Browse Bundle entries
Filter resources by type, inspect individual entries, and review duplicate identifiers or unresolved references.
Select a Bundle entry to inspect its resource.
FAQ
FHIR viewer questions
Does this validate FHIR conformance?
No. It validates JSON syntax and provides practical resource and Bundle checks, but it does not validate against the complete FHIR specification, profiles, terminology bindings, or implementation guides.
Which FHIR versions can it display?
The JSON tree works with any JSON-based FHIR resource. The built-in summaries focus on common R4-style fields and degrade gracefully when fields differ.
How are Bundle references checked?
The tool builds an index from Bundle fullUrl values and resourceType/id pairs, then checks reference strings that can be resolved within the Bundle. External references are listed separately rather than treated as automatically invalid.
Can I paste real patient data?
No. Use synthetic or appropriately de-identified test data only.