{"library":"polkadot-middleware","title":"Polkadot Middleware","description":"The `polkadot-middleware` package provides a familiar middleware pattern for the `polkadot` HTTP server, streamlining request handler composition. Currently at version 1.0.1, it offers a functional alternative to manual function nesting, simplifying the development of server-side logic. This library addresses the current lack of a native pipeline operator in JavaScript, allowing developers to chain asynchronous request/response functions linearly. It serves a specific niche for users of the lightweight `polkadot` server who desire an Express.js-like middleware experience without significant overhead, focusing on readability and maintainability for simple API servers.","language":"javascript","status":"active","last_verified":"Wed Apr 22","install":{"commands":["npm install polkadot-middleware"],"cli":null},"imports":["import middleware from 'polkadot-middleware'","import polkadot from 'polkadot'"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import polkadot from 'polkadot';\nimport middleware from 'polkadot-middleware';\n\nasync function handleErrors(next) {\n\treturn async (req, res) => {\n\t\ttry {\n\t\t\treturn await next(req, res);\n\t\t} catch (err) {\n\t\t\tres.statusCode = 500;\n\t\t\treturn err.message || err;\n\t\t}\n\t};\n}\n\nasync function setCacheControl(next) {\n\treturn async (req, res) => {\n\t\tres.setHeader(`Cache-Control`, `public, max-age=` + 3600);\n\t\treturn next(req, res);\n\t};\n}\n\nmiddleware(\n\tpolkadot,\n\thandleErrors,\n\tsetCacheControl,\n\t(req, res) => 'Sup dawg'\n).listen(8080, () => console.log('Server listening on http://localhost:8080'));","lang":"javascript","description":"Demonstrates chaining multiple middleware functions for error handling and cache control with a basic response using `polkadot-middleware`.","tag":null,"tag_description":null,"last_tested":null,"results":[]},"compatibility":null}