Free FHIR developer tools
Small, honest tools for people building on FHIR — each does one real job, with no signup and no upload. Run them in your browser; your data stays local.
FHIR Token, Cost & Context Calculator
Paste a record or a search query → exact token counts, per-resourceType breakdown, free-text share, context-window fit + per-model cost, and how much a projected slice would save. The first FHIR-aware one we know of.
Open the calculator →FHIR Validator + Repair
Paste a broken resource → what's wrong in TypeScript-type terms, plus a corrected resource and the typed builder code. Deterministic, typed, offline.
Open validator + repair →The Context Bomb
An overflowing ICU chart is ~1.3M tokens; your model holds ~1M. Watch one overflow every window, then watch a query-aware projection collapse it ~100× into a cited slice that keeps the earliest value.
Detonate it →Grade the Graders
The cheap single-LLM judge we audited is 61% accurate — 43 false negatives, 0 false positives. It rejects exact-right answers. Play "you be the judge."
Score the judges →Projection Explorer
Godbolt for clinical context: pick a question, watch a FHIR record compile to the query-aware slice your agent should see — with a coverage certificate, tokens-in vs out, and click-to-highlight source↔compiled mapping.
Open the explorer →Dense synthetic FHIR bundles soon
Download deterministic, clinically-dense synthetic patients (CC0) — the large records that actually overflow a context window. No Synthea jar, no PHI.
Coming soonAI-generate the workflow. Don't AI-generate the clinical data layer.
These tools point at one thing: an agent shouldn't see a raw multi-hundred-thousand-token FHIR record. bonfireDB projects a cited, ABAC-scoped slice that fits.