javascript - SyntaxError: Use of const in strict mode -
i'm working node.js, , in 1 of js files i'm using const in "strict mode" . when trying run it, i'm getting error: syntaxerror: use of const in strict mode. what best practice this? edit: 'use strict' const max_image_size = 1024*1024; // 1 mb the const , let part of ecmascript 2015 (a.k.a. es6 , harmony), , not enabled default in node.js 0.10 or 0.12. since node.js 4.x, “all shipping [es2015] features, v8 considers stable, turned on default on node.js , not require kind of runtime flag.”. node.js docs has overview of es2015 features enabled default, , require runtime flag . upgrading node.js 4.x or newer error should disappear. to enable of ecmascript 2015 features (including const , let ) in node.js 0.10 , 0.12; start node program harmony flag, otherwise syntax error. example: node --harmony app.js it depends on side strict js located. recommend using strict mode const declarations on server side , start server harmony flag....