Core Utilities
Base64 Encoder / Decoder
Encode or decode text in Base64. All conversion happens locally in your browser.
URL Encoder / Decoder
Encode and decode URL and query string values.
HTML / XML Escaper
Escape and unescape HTML/XML entities in clinical payloads and logs.
JSON Pretty Print / Validator
Validate JSON and format it for readability or compact transport.
JSON ↔ YAML Converter
Convert FHIR/JSON payloads into readable YAML.
CSV ↔ JSON Converter
Convert between header-based CSV/TSV and JSON arrays.
Regex Tester
Test JavaScript regular expressions against HL7, FHIR, and log snippets.
Security & Identity
UUID Generator
Generate random version 4 UUIDs for testing and correlation IDs.
UUID ↔ OID 2.25
Convert between UUIDs and 2.25. <decimal> OIDs used in IHE XDS and HIE document workflows.
JWT Inspector
Decode JSON Web Tokens (JWT) into header, payload, and signature for quick inspection.
SAML Decoder
Decode SAML messages for HTTP POST and HTTP Redirect bindings, step by step.
X.509 Certificate Inspector
Inspect PEM-encoded X.509 certificates, detect blocks, and compute SHA-256 / SHA-1 fingerprints.
NPI Validator
Validate National Provider Identifiers (NPIs) using the official check-digit algorithm.
Hash Calculator
Compute SHA-256 and SHA-1 hashes of text using Web Crypto.
JWS Inspector
Decode header and payload from compact JWS (no signature verification).
XML & Documents
XML Pretty Print/Validator
Validate and pretty-print XML documents such as CDA, FHIR XML, and XDS metadata.
CDA Pretty Print
Indent CDA XML for easier inspection.
OID Parser / Formatter
Inspect dotted-decimal OIDs and their arcs.
XDS Metadata Builder
Generate a minimal XDS.b ExtrinsicObject metadata snippet.
Time & Timestamps
Epoch ↔ ISO8601 Converter
Convert between Unix epoch timestamps and ISO8601, with UTC and local views.
HL7 v2 TS / DT Parser
Parse HL7 v2 timestamps into components and convert to UTC and local time.
Duration / Interval Calculator
Compute elapsed time between two timestamps.
Test Data Generator
Generate random MRNs, UUIDs, and sample FHIR Patient resources.
HL7 v2 Tools
HL7 v2 Pretty Print
Split HL7 v2 messages into segments and fields for easier inspection.
HL7 v2 Segment Inspector
View all segments of a given type and inspect their fields.
HL7 v2 Structural Checker
Run quick sanity checks on HL7 v2 message structure.
HL7 v2 Escape Sequences
Encode and decode HL7 v2 escape sequences for special characters.
HL7 v2 Field Extractor
Extract a specific field from all segments of a given type
FHIR & JSON Tools
FHIR Resource Pretty Print
Validate and pretty-print a single FHIR JSON resource.
FHIR Bundle Explorer
Inspect entries in a FHIR Bundle and drill into individual resources.
FHIRPath Sampler
Run simple dotted expressions with array indexes against FHIR JSON.
FHIR Coding Inspector
Inspect FHIR Coding / CodeableConcept values for system, code, and display.
SMART on FHIR Inspector
Decode JWT tokens and inspect key SMART on FHIR claims.
HTTP Helpers
HTTP Request Builder (curl)
Build curl commands for REST and FHIR calls.
HTTP Header Parser
Parse raw HTTP headers into a readable table.
Content-Type Helper
Pick appropriate Content-Type headers for FHIR, HL7, and other payloads.
Diff & Debug Utilities
Diff Viewer (Text / JSON)
Compare two text blobs line-by-line.
Hex / Base16 Viewer
Convert between text and hexadecimal byte sequences.
String Normalization Helper
Trim, collapse spaces, and normalize newline styles.