Open shoe-size data
Use our public brand JSON for footwear-size research, prototypes and reporting. Each record keeps its fit context and provenance; it is not a replacement for the official chart of a specific shoe.
Public brand endpoints
Each link returns a static JSON response with size records, width availability, confidence, provenance and freshness metadata. Responses allow cross-origin use and can be cached for 24 hours.
Use and attribution
The endpoint data is available under CC BY 4.0. Attribute ShoeSizeguide.com with a link, retain the provenance context, and do not present the data as an official brand chart or a guarantee of fit.
Foot length is the stable reference. Brand and model fit, width, socks and intended use can still change the right purchase decision.
Example request
GET https://shoesizeguide.com/api/sizes/nike.json