FHIR Message Analyzer

Analyzer help

Parse

Paste a FHIR R4 JSON resource or Bundle. Format pretty-prints JSON or converts common FHIR XML. Import opens a JSON or Inspect CSV file from this computer. The analyzer shows structure, meta, highlights, and educational validation hints. Nothing is uploaded.

Inspect

Overview shows key facts and a flat, searchable path list (easiest for most pastes). Structure shows the nested JSON tree when you need to dig deeper. Show empty lists null and blank paths in both views. Export CSV and Export JSON download the visible Overview rows; JSON also includes the FHIR resource. Import rebuilds from that JSON or CSV.

PHI scrub

Nothing is uploaded. Use How it works under the message box (or Client-side only in Config) for the details, benefits, and limits. Scrub replaces names, identifiers, phones, and addresses with synthetic values for safer screenshots. Prefer synthetic data; this is not a formal de-ID algorithm.

OperationOutcome

A minimal OperationOutcome, the FHIR analogue of an ACK, built live from the pasted resource. When the resource has errors it starts as an error outcome naming the first problem; information is only allowed for a clean resource and always uses the informational code. Use Inspect outcome to open it in the tree.

Compare

Use Compare… next to Copy outcome (or in Config) for a side-by-side path diff of changed, removed and added values — useful for reference and identifier mismatches. FHIR XML is read as JSON.

Message

Original paste — always kept

Runs in this browser. Nothing you paste is uploaded.

Snippets and remember

Remember last message in this browser

Pasting parses right away · Ctrl/⌘ + Enter re-parses after edits · Format pretty-prints JSON or converts FHIR XML; nothing else changes your paste · Import opens JSON or CSV · Related templates never overwrite this field

Inspect

Nothing to parse yet.

Show empty

resourceType—

id—

lastUpdated—

Filter fields

A flat list of important paths — easier than digging through nested JSON.

Path	Description	Value
Nothing to parse yet.

Respond

Related stubs & OperationOutcome builder

OperationOutcome builder

Paste or load a resource to build an OperationOutcome for it.

Generated replies are stubs. Check them before sending to a live interface.

Severity

Code

Diagnostics

Expression (optional)

Next messages and templates

Related messages

Response / related JSON

Pick a related template to see its JSON here.

Message

Inspect

Respond

Compare messages

Client-side only

How it works

Benefits

Limits