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Cachelos\n[![npm version](https://badge.fury.io/js/%40merlos%2Fcachelos.svg)](https://badge.fury.io/js/%40merlos%2Fcachelos)\n\nSimple browser cache for storing JSON requests in a Local Storage cache.\n\n## Usage\n\n```\nnpm install --save @merlos/cachelos\n```\n\nThen in your code:\n\n\n```js static\nimport { Cache } from 'cachelos'\n\n/**\n * Basic example\n */\nexport const example1 = async () =\u003e {\n  const cache = Cache()\n  const url = './users.json'\n  try {\n    console.log('==== example 1 ========')\n    console.log('1) A fetch that makes a request to server')\n    const users = await cache.fetch(url)\n    console.log('   Response:', users) // an array with users\n    console.log('   isValid', cache.isValid(url)) // true\n    console.log('   expiresOn:', Date.parse(cache.getExpiresOn()))\n\n    console.log('2) Second fetch gets JSON from cache, not from server')\n    const users2 = await cache.fetch(url)\n    console.log('   Response:', users2) // an array with users\n  } catch (error) {\n    console.log(error)\n  }\n  //Clear cache\n  cache.clear()\n}\n\n//Sleep function\nfunction sleep(sec) {\n  return new Promise((resolve) =\u003e setTimeout(resolve, sec * 1000))\n}\n\nconst example2 = async () =\u003e {\n  try {\n    const config = {\n      name: 'MyCacheName', //If you need have more than one cache at a time, set a name\n      expiresAfter: 5, // Time an item in the cache will persist as valid in ms}\n    }\n    console.log('==== example 2  ========')\n    console.log(`Cache items will expire after ${config.expiresAfter} sec`)\n    const cache = Cache(config)\n    const url = './users.json'\n\n    console.log('1) A fetch that makes a request to server')\n    const users = await cache.fetch(url)\n    console.log('   isValid? ', cache.isValid(url)) // true\n    console.log('   expiresOn:', Date(cache.getExpiresOn()))\n\n    console.log('2) Waiting 6 seconds:')\n    await sleep(6)\n    console.log('   done waiting')\n    console.log('   isValid? ', cache.isValid(url)) // false\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nconst example3 = async () =\u003e {\n  try {\n    const config = {\n      expiresAfter: 5, // Time an item in the cache will persist in seconds\n    }\n    console.log('==== example 3 ========')\n    console.log(`Cache items will expire after ${config.expiresAfter} sec`)\n    const cache = Cache(config)\n    const url = './users.json'\n\n    // If you want to have a lower level control of the cache\n    // you can create your own fetch\n    const myCacheFetch = async (url) =\u003e {\n      if (cache.isValid(url)) {\n        console.log('myCacheFetch: data from cache')\n        return cache.get(url)\n      }\n      console.log('myCacheFetch: data from server')\n      const res = await fetch(url)\n      if (res.ok) {\n        const data = await res.json()\n        //save item to cache\n        cache.set(url, data)\n        return data\n      }\n      throw Error(res.errorText)\n    }\n\n    console.log('1) myCacheFech fetch ')\n    const users = await myCacheFetch(url)\n    console.log('2) Waiting 6 seconds:')\n    await sleep(6)\n    console.log('   done waiting')\n    console.log('   isValid?', cache.isValid(url))\n    const users2 = await myCacheFetch(url)\n  } catch (error) {\n    console.log(error)\n  }\n}\n\nconst runExamples = async () =\u003e {\n  await example1()\n  await example2()\n  await example3()\n}\n\nrunExamples().then('finished running example')\n```\n\nNote that the cache uses the URL as part of the key.\n\nThe cache expects the responses to be JSON valid contents.\n\n## Development\n\n```bash\ngit clone https://github.com/merlos/cachelos.git\nnpm install\n```\n\n### `npm start`\n\nRuns a server in `http://localhost:3000/` in watch mode pointing to the [examples folder](https://github.com/merlos/cachelos/tree/master/examples)\n\n### `npm run build`\n\nBuilds the package for distribution\n\n### `npm test`\n\nRuns the tests\n\n\n## License MIT\n\nMIT License\n\nCopyright (c) 2020 Juan M. Merlos (@merlos)\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in all\ncopies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\nSOFTWARE.\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmerlos%2Fcachelos","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmerlos%2Fcachelos","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmerlos%2Fcachelos/lists"}