{"id":33670,"date":"2023-02-11T15:41:54","date_gmt":"2023-02-11T10:11:54","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-node-js-how-do-i-save-json-data-without-filling-up-my-storage-closed\/"},"modified":"2023-02-11T15:41:54","modified_gmt":"2023-02-11T10:11:54","slug":"solved-node-js-how-do-i-save-json-data-without-filling-up-my-storage-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-node-js-how-do-i-save-json-data-without-filling-up-my-storage-closed\/","title":{"rendered":"[Solved] NODE.JS How do I save JSON data without filling up my storage [closed]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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config<\/strong><\/p>\n

For this answer we’ll establish a simple config<\/code> object to store any values –<\/p>\n

\/\/ config.json\n\n{\"counter\":0}\n<\/code><\/pre>\n
server<\/strong><\/p>\n
We will create a simple server using http.createServer<\/a>. We will use the request method and request URL to look up a handler<\/code> or respond with 404 when no handler is found –<\/p>\n
\/\/ server.js\n\nimport { createServer } from \"http\"\nimport { readFile, writeFile } from \"fs\/promises\"\n\nconst server = createServer(async (req, res) => {\n  const handler = routes?.[req.method.toLowerCase()]?.[req.url]\n  if (handler == null) {\n    res.writeHead(404, {'Content-Type': 'text\/plain'})\n    res.end(`No route for ${req.method} ${req.url}`)\n  }\n  else {\n    await handler(req, res)\n    res.end()\n  }\n})\n\nserver.listen(8000)\n<\/code><\/pre>\n
Next we define the routes<\/code> to \/getConfig<\/code> and \/saveConfig<\/code> –<\/p>\n
\/\/ server.js (continued)\n\nconst routes = {\n  get: {\n    \"\/getConfig\": async (req, res) => {\n      res.writeHead(200, {'content-type': 'application\/json'})\n      res.write(await readFile(\".\/config.json\"))\n    }\n  },\n  post: {\n    \"\/saveConfig\": async (req, res) => {\n      await writeFile(\".\/config.json\", await readBody(req))\n      res.writeHead(204)\n    },\n    \"\/reset\": async (req, res) => {\n      await writeFile(\".\/config.json\", JSON.stringify({ counter: 0 }))\n      res.writeHead(204)\n    }\n  }\n}\n<\/code><\/pre>\n
This depends on a reusable helper, readBody<\/code> –<\/p>\n
\/\/ server.js (continued)\n\nfunction readBody(req) {\n  return new Promise((resolve, reject) => {\n    const body = []\n    req.on('data', chunk => body.push(Buffer.from(chunk)))\n    req.on('end', _ => resolve(Buffer.concat(body).toString()))\n    req.on('error', reject)\n  })\n}\n<\/code><\/pre>\n
client<\/strong><\/p>\n
In this case your bot is the http client. The node docs for http.get<\/a> include this long-winded example, but don’t let it worry you –<\/p>\n
\/\/ example from node docs\n\nhttp.get('http:\/\/localhost:8000\/', (res) => {\n  const { statusCode } = res;\n  const contentType = res.headers['content-type'];\n\n  let error;\n  \/\/ Any 2xx status code signals a successful response but\n  \/\/ here we're only checking for 200.\n  if (statusCode !== 200) {\n    error = new Error('Request Failed.\\n' +\n                      `Status Code: ${statusCode}`);\n  } else if (!\/^application\\\/json\/.test(contentType)) {\n    error = new Error('Invalid content-type.\\n' +\n                      `Expected application\/json but received ${contentType}`);\n  }\n  if (error) {\n    console.error(error.message);\n    \/\/ Consume response data to free up memory\n    res.resume();\n    return;\n  }\n\n  res.setEncoding('utf8');\n  let rawData=\"\";\n  res.on('data', (chunk) => { rawData += chunk; });\n  res.on('end', () => {\n    try {\n      const parsedData = JSON.parse(rawData);\n      console.log(parsedData);\n    } catch (e) {\n      console.error(e.message);\n    }\n  });\n}).on('error', (e) => {\n  console.error(`Got error: ${e.message}`);\n});\n<\/code><\/pre>\n
You’re not expected to copy this verbatim. Imagine writing that much code each time you wanted to fetch some JSON. You can think of the http<\/a> module as a low-level API that enables you to design higher-level functions –<\/p>\n
\/\/ client.js \n\nimport * as http from \"http\"\n\nfunction request (href, { body = \"\", ...options } = {}) {\n  return new Promise((resolve, reject) =>\n    http.request(href, options, res => {\n      const data = []\n      res.on('data', chunk => data.push(chunk))\n      res.on('end', _ => resolve({\n        status: res.statusCode,\n        headers: res.headers,\n        data: Buffer.concat(data).toString()\n      }))\n    })\n    .on('error', reject)\n    .end(body)\n  )\n}\n<\/code><\/pre>\n
Above our request<\/code> function resolves a { status, headers, data }<\/code> object, and we can write specialized forms get<\/code> and getJson<\/code> that make it even easier to intereact with –<\/p>\n
\/\/ client.js (continued)\n\nasync function get (href) {\n  const { status, headers, data } = await request(href)\n  if (status < 200 || status >= 300)\n    throw Error(status)\n  return { status, headers, data }\n}\n\nasync function getJson (href) {\n  const { headers, data } = await get(href)\n  if (!headers['content-type'].startsWith(\"application\/json\"))\n    throw Error(`expected application\/json but received ${headers['content-type']}`)\n  return JSON.parse(data)\n}\n<\/code><\/pre>\n
We can do the same for post<\/code> –<\/p>\n
\/\/ client.js (continued)\n\nasync function post (href, body = \"\") {\n  const { status, headers, data } = await request(href, { body, method: \"POST\" })\n  if (status < 200 || status >= 300)\n    throw Error(status)\n  return { status, headers, data }\n}\n<\/code><\/pre>\n
Finally here is our bot<\/code> code. It reads the config via get<\/code>, updates the config via post<\/code>, and re-reads it via get<\/code> to return the confirmed result –<\/p>\n
\/\/ client.js (continued)\n\nasync function bot() {\n  const config = await getJson(\"http:\/\/localhost:8000\/getConfig\")\n  await post(\"http:\/\/localhost:8000\/saveConfig\", JSON.stringify({counter: config.counter + 1}))\n  return getJson(\"http:\/\/localhost:8000\/getConfig\")\n}\n\nbot().then(console.log, console.error)\n<\/code><\/pre>\n
run<\/strong><\/p>\n
Start the server<\/code> in your terminal –<\/p>\n
$ node .\/server.js\n<\/code><\/pre>\n
In a separate terminal<\/strong>, run the client<\/code> a few times –<\/p>\n
$ node .\/client.js\n<\/code><\/pre>\n
{ counter: 1 }\n<\/code><\/pre>\n
$ node .\/client.js\n<\/code><\/pre>\n
{ counter: 2 }\n<\/code><\/pre>\n
$ node .\/client.js\n<\/code><\/pre>\n
{ counter: 3 }\n<\/code><\/pre>\n
node modules<\/strong><\/p>\n
Above we took a sort of DIY approach to the problem. But this kind of problem has been solved many ways before. There are popular libraries like express<\/a> and koajs<\/a> that would make much of this a lot easier. Now that you know the purpose they serve, give ’em a try!<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
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solved NODE.JS How do I save JSON data without filling up my storage [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
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We will use the request method and request URL to look up a handler or respond with 404 when no handler is found – \/\/ server.js import … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[819,333,356,902],"class_list":["post-33670","post","type-post","status-publish","format-standard","hentry","category-solved","tag-discord-js","tag-javascript","tag-json","tag-node-js"],"yoast_head":"\n[Solved] NODE.JS How do I save JSON data without filling up my storage [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-node-js-how-do-i-save-json-data-without-filling-up-my-storage-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] NODE.JS How do I save JSON data without filling up my storage [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] config For this answer we’ll establish a simple config object to store any values – \/\/ config.json {"counter":0} server We will create a simple server using http.createServer. 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