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JavaScript Express Basics Using Templates with Express Express’s Response.render Method

Caleb Evans
Caleb Evans
5,986 Points
Posted by Caleb Evans
Caleb Evans
5,986 Points

Having trouble using the objects/arrays I pass to the pug file through res.render. Says property of length is undefined.

TypeError: /Users/calebevans/Documents/software/projects/budget-app/views/sandbox.pug:18

Cannot read property 'length' of undefined at eval (eval at wrap (/Users/calebevans/Documents/software/projects/budget-app/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:85:32) at eval (eval at wrap (/Users/calebevans/Documents/software/projects/budget-app/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:112:4) at template (eval at wrap (/Users/calebevans/Documents/software/projects/budget-app/node_modules/pug-runtime/wrap.js:6:10), <anonymous>:117:7) at Object.exports.renderFile (/Users/calebevans/Documents/software/projects/budget-app/node_modules/pug/lib/index.js:454:38) at Object.exports.renderFile (/Users/calebevans/Documents/software/projects/budget-app/node_modules/pug/lib/index.js:444:21) at View.exports.__express as engine at View.render (/Users/calebevans/Documents/software/projects/budget-app/node_modules/express/lib/view.js:135:8) at tryRender (/Users/calebevans/Documents/software/projects/budget-app/node_modules/express/lib/application.js:640:10) at Function.render (/Users/calebevans/Documents/software/projects/budget-app/node_modules/express/lib/application.js:592:3) at ServerResponse.render (/Users/calebevans/Documents/software/projects/budget-app/node_modules/express/lib/response.js:1017:7)

Caleb Evans
Caleb Evans
5,986 Points
Caleb Evans
Caleb Evans
5,986 Points

const colors = [ 'red', 'orange', 'yellow', 'green', 'blue', 'purple' ];

```app.get("/sandbox", (req, res) => { res.render("sandbox", colors) })

1 Answer

jb30
jb30
44,805 Points

Try changing app.get("/sandbox", (req, res) => { res.render("sandbox", colors) }) to app.get("/sandbox", (req, res) => { res.render("sandbox", {colors}) })