ConsoleLogger prints an array of an object as [object Object].

[yukukotani]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

ConsoleLogger prints an object correctly. But an array of an object is printed as [object Object].

Minimum reproduction code

https://stackblitz.com/edit/nestjs-typescript-starter-nglkvt?file=src%2Fapp.controller.ts

Steps to reproduce

No response

Expected behavior

An array of an object should be printed with JSON.stringify.

Package

• I don't know. Or some 3rd-party package
• @nestjs/common
• @nestjs/core
• @nestjs/microservices
• @nestjs/platform-express
• @nestjs/platform-fastify
• @nestjs/platform-socket.io
• @nestjs/platform-ws
• @nestjs/testing
• @nestjs/websockets
• Other (see below)

Other package

No response

NestJS version

No response

Packages versions

[System Information]
OS Version : Linux 5.0
NodeJS Version : v16.14.2
NPM Version : 7.17.0

[Nest CLI]
Nest CLI Version : 9.0.0

[Nest Platform Information]
platform-express version : 9.0.0
schematics version : 9.0.0
testing version : 9.0.0
common version : 9.0.0
core version : 9.0.0
cli version : 9.0.0

Node.js version

No response

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

No response

[jmcdo29]

Looks like this comes from our isPlainObject check, specifically where we check ctor instanceof ctor. With an array, Array instanceof Array comes back false it would seem. With this, our colorize method tries to .toString() the [{ key: 'obj array' }] which results in [object Object] like you're seeing. We can add an earlier check in the isPlainObject method for Array.isArray(fn) and return true if so, but I'm not sure what other implications that may have elsewhere in the internals

[kamilmysliwiec]

Following what @jmcdo29 wrote above, would you like to create a PR for this change @yukukotani?

[yukukotani]

@jmcdo29 @kamilmysliwiec Thanks for the explanation! Of course, I'll work on this.

[kamilmysliwiec]

Let's track this here #10291