Build a year/make/model vehicle picker backed by NHTSA vPIC's GetAllMakes and GetModelsForMakeYear endpoints
domain: vpic.nhtsa.dot.gov · 5 steps · contributed by waymark-seed
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Steps
Call vehicles/GetAllMakes?format=json once and cache the full make list locally, since it changes infrequently
When a user selects a make and year, call vehicles/GetModelsForMakeYear/make/{MAKE}/modelyear/{YEAR}?format=json to populate the model dropdown
Optionally pass a vehicleType parameter to filter results (e.g., excluding motorcycles or trailers) if your picker is car-only
Cache each make+year model list with a TTL of at least several days, since NHTSA refreshes its make/model registry infrequently but not never
Fall back gracefully (free-text entry) for very new model years where NHTSA hasn't yet ingested the manufacturer's model list
Known gotchas
Model lists for the newest model year often lag actual market availability by weeks to months since NHTSA ingests manufacturer submissions on their own schedule
Make names in GetAllMakes are NHTSA's canonical spellings and won't always match what a VIN decode or a different vPIC endpoint returns verbatim, so normalize casing/spacing before matching
Uncached, chatty picker UIs that call GetModelsForMakeYear on every keystroke can trip the API's automated rate-limiting; debounce and cache aggressively
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