{"id":1230,"date":"2015-02-16T08:35:37","date_gmt":"2015-02-16T08:35:37","guid":{"rendered":"http:\/\/www.nikola-breznjak.com\/blog\/?p=1230"},"modified":"2015-08-20T11:54:00","modified_gmt":"2015-08-20T11:54:00","slug":"redis-with-node-js","status":"publish","type":"post","link":"https:\/\/nikola-breznjak.com\/blog\/javascript\/nodejs\/redis-with-node-js\/","title":{"rendered":"How to use Redis with Node.js"},"content":{"rendered":"

Redis<\/a>\u00a0is an open source, BSD licensed, advanced\u00a0<\/span>key-value cache<\/span>\u00a0and\u00a0<\/span>store<\/span>. It is often referred to as a\u00a0<\/span>data structure server<\/span>\u00a0since keys can contain\u00a0<\/span>strings<\/a>,\u00a0<\/span>hashes<\/a>,\u00a0<\/span>lists<\/a>,\u00a0<\/span>sets<\/a>,\u00a0<\/span>sorted sets<\/a>,\u00a0<\/span>bitmaps<\/a>\u00a0and\u00a0<\/span>hyperloglogs<\/a>.<\/span><\/p><\/blockquote>\n

Comparison with Memcache and Memcached can be found here<\/a>, and the naming distinction can be found here<\/a>.<\/p>\n

You can download the installation zip file here<\/a>\u00a0(I used the Windows version), and extract it to C:\\redis<\/strong>. To run the Redis server (in order to be able to save to it and query it) you have to execute the redis-server.exe<\/strong> from this directory.<\/p>\n

To use Redis with Node.js you have install the redis module<\/a>:<\/p>\n

npm install redis<\/pre>\n
A simple\u00a0usage example:<\/p>\n
var redis = require(\"redis\"),\r\n    client = redis.createClient();\r\n\r\n\/\/ if you'd like to select database 3, instead of 0 (default), call\r\n\/\/ client.select(3, function() { \/* ... *\/ });\r\n\r\nclient.on(\"error\", function (err) {\r\n    console.log(\"Error \" + err);\r\n});\r\n\r\nclient.set(\"string key\", \"string val\", redis.print);\r\nclient.hset(\"hash key\", \"hashtest 1\", \"some value\", redis.print);\r\nclient.hset([\"hash key\", \"hashtest 2\", \"some other value\"], redis.print);\r\nclient.hkeys(\"hash key\", function (err, replies) {\r\n    console.log(replies.length + \" replies:\");\r\n    replies.forEach(function (reply, i) {\r\n        console.log(\"    \" + i + \": \" + reply);\r\n    });\r\n    client.quit();\r\n});<\/pre>\n
A lot<\/strong>\u00a0more examples here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Redis\u00a0is an open source, BSD licensed, advanced\u00a0key-value cache\u00a0and\u00a0store. It is often referred to as a\u00a0data structure server\u00a0since keys can contain\u00a0strings,\u00a0hashes,\u00a0lists,\u00a0sets,\u00a0sorted sets,\u00a0bitmaps\u00a0and\u00a0hyperloglogs. Comparison with Memcache and Memcached can be…<\/p>\n","protected":false},"author":1,"featured_media":1232,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1230","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nodejs"],"_links":{"self":[{"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/posts\/1230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/comments?post=1230"}],"version-history":[{"count":5,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/posts\/1230\/revisions"}],"predecessor-version":[{"id":2137,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/posts\/1230\/revisions\/2137"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/media\/1232"}],"wp:attachment":[{"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/media?parent=1230"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/categories?post=1230"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nikola-breznjak.com\/blog\/wp-json\/wp\/v2\/tags?post=1230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}