#rest

Expand URI Templates (RFC 6570) — the standard used by GitHub, OpenAPI/Swagger, HAL and many hypermedia APIs — to build URLs from a template and a set of variables. The expand endpoint takes a template such as /users/{user}{?page,per_page} and a JSON object of variables, and returns the finished URI with everything correctly percent-encoded. It implements all four levels of the spec: simple expansion {var}; reserved {+var} and fragment {#var} expansion; the label {.var}, path {/var}, path-style-parameter {;var}, query {?var} and query-continuation {&var} operators; multiple variables {x,y}; and the value modifiers — prefix {var:3} (first N characters) and explode {var*} (expand lists and maps element by element). Variables can be strings, lists or associative maps. The parse endpoint inspects a template and lists its expressions, operators and variable names. Everything is computed locally and deterministically, so it is instant and private. Ideal for REST and hypermedia clients, API SDKs and code generators, OpenAPI tooling, and link building. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This expands URI templates; for building or parsing query strings use a query-string API and for canonicalising URLs use a URL API.

api.oanor.com/uritemplate-api

Every HTTP status code as an API. Look up any code (e.g. 404, 429, 503) and get its standard reason phrase, its class (1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, 5xx Server Error), a plain-English description, the RFC that defines it, and handy flags for whether it is an error and whether it is commonly safe to retry (408, 425, 429, 500, 502, 503, 504). List every assigned code or filter by class, and enumerate the five status classes. Perfect for API clients and gateways, error pages, logging and monitoring dashboards, documentation and teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from host/uptime checkers that report a live status — this is the reference dictionary of the codes themselves.

api.oanor.com/httpstatus-api