Every team that ships FHIR search queries eventually notices the same pattern: two developers write the same-shaped query with different conventions, and the second one costs a review round. Codifying the conventions is small work up front...
Category: Fhir Search Lint
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Linter Rules to Catch the Ten Most Common Search Mistakes
A FHIR search linter is a small pile of rules that check a query string before it hits the server. The site's FHIR search query auditor implements the rules below. They are the payoff-heavy list — each catches a class of mistake that...
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Sort Order That Survives Resource Updates
FHIR sort is a _sort parameter with a comma-separated list of parameter names, optionally negated with a leading dash for descending order. The mechanic looks simple. It becomes not-simple the moment two resources tie on the sort key and...
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Using _count and _offset Without Losing Consistency
FHIR search pagination is a topic where the spec is careful and the servers vary. _count requests a page size, servers may cap it, offset-style pagination via _offset produces inconsistent results when the underlying set changes between...
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Modifier Stacking: :not, :in, :missing Without Foot-Guns
FHIR search modifiers turn a plain parameter into a set-operation query. :not inverts, :in filters against a value set, :missing finds resources where the element is absent. Each is useful; each has edge cases; server support is uneven....
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Date Search Precision and the Range It Implicitly Covers
FHIR date search has a precision-implies-range rule that trips up callers who have not read the chapter. A search for ?date=2026 matches everything in that year. A search for ?date=2026-07-11 matches everything on that day. The precision...
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Reserved Characters in Search Values That Break Silently
FHIR search reserves a small set of characters for structural meaning inside a search value: comma, ampersand, pipe, dollar sign, and a couple of others. Values that carry any of them raw truncate silently at the first delimiter, and the...
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The FHIR Searches That Look Correct But Are Wrong
FHIR search is permissive on the way in. The server accepts the parameters, returns a searchset Bundle, and reports no error. That combination hides a category of queries that are syntactically valid, semantically wrong, and produce...