NestJS CLI installation - Step-by-Step Execution

Concept Flow - NestJS CLI installation

Open Terminal

↓

Check Node.js Installed?

No→Install Node.js

Yes↓

Run npm install -g @nestjs/cli

↓

Verify CLI Installation with nest --version

↓

Ready to create NestJS projects

This flow shows the steps to install NestJS CLI: open terminal, ensure Node.js is installed, install CLI globally, verify installation, then start using it.

Execution Sample

NestJS

npm install -g @nestjs/cli
nest --version

Installs NestJS CLI globally and checks the installed version.

Execution Table

Step	Action	Command Run	Result	Next Step
1	Open terminal	N/A	Terminal ready	Check Node.js installed
2	Check Node.js	node -v	v18.15.0	Run npm install -g @nestjs/cli
3	Install NestJS CLI globally	npm install -g @nestjs/cli	CLI installed successfully	Verify CLI installation
4	Verify CLI installation	nest --version	9.0.0	Ready to create projects
5	End	N/A	NestJS CLI ready to use	N/A

💡 NestJS CLI installed and verified, ready for project creation.

Variable Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	Final
Node.js Version	Not checked	v18.15.0	v18.15.0	v18.15.0	v18.15.0
NestJS CLI Installed	No	No	Yes	Yes	Yes
NestJS CLI Version	N/A	N/A	N/A	9.0.0	9.0.0

Key Moments - 3 Insights

What if 'node -v' command fails at step 2?

If 'node -v' fails, Node.js is not installed or not in PATH. You must install Node.js first before installing NestJS CLI. See step 2 in execution_table.

Why do we use '-g' in 'npm install -g @nestjs/cli'?

The '-g' flag installs the CLI globally so you can run 'nest' command anywhere in the terminal. This is shown in step 3 of execution_table.

What does 'nest --version' confirm?

'nest --version' confirms the CLI installed correctly and shows its version. This verification is step 4 in execution_table.

Visual Quiz - 3 Questions

Look at the execution table, what is the Node.js version after step 2?

A v18.15.0

B v16.0.0

C Not installed

D v20.0.0

💡 Hint

Check the 'Result' column in row for step 2 in execution_table.

At which step does the NestJS CLI become installed?

A Step 2

B Step 4

C Step 3

D Step 1

💡 Hint

Look at the 'NestJS CLI Installed' variable in variable_tracker after each step.

If 'nest --version' shows an error, what should you check first?

A If Node.js is installed

B If NestJS CLI was installed globally

C If terminal is open

D If npm is updated

💡 Hint

Refer to key_moments about the '-g' flag and step 4 verification.

Concept Snapshot

NestJS CLI Installation:
1. Open terminal
2. Ensure Node.js installed (node -v)
3. Run npm install -g @nestjs/cli to install CLI globally
4. Verify with nest --version
5. CLI ready to create projects

Full Transcript

To install the NestJS CLI, first open your terminal. Check if Node.js is installed by running 'node -v'. If Node.js is not installed, install it first. Then run 'npm install -g @nestjs/cli' to install the CLI globally. After installation, verify it by running 'nest --version' which should show the CLI version. Once verified, you can start creating NestJS projects using the CLI commands.