PowerShell Webservice - Working with RESTful APIs using Invoke-RestMethod

Working with RESTful APIs using Invoke-RestMethod.
Making webservice api calls in PowerShell.

Let's see how to effortlessly retrieve data with GET requests, create new resources with POST requests, handle authentication, and gracefully manage errors.

jsonplaceholder API URL:
https://jsonplaceholder.typicode.com/

Example code used in this video

#GET Method

$response = Invoke-RestMethod -Uri "https://jsonplaceholder.typicode.com/posts/1"
$response

#POST Method
$newPost = @{
userId = 1
title = "New Post"
body = "This is the content of the new post."
}

$response = Invoke-RestMethod -Uri "https://jsonplaceholder.typicode.com/posts" -Method Post -Body ($newPost | ConvertTo-Json) -ContentType "application/json"
$response


#Basic Auth

$username = "your_username"
$password = "your_password"
$base64Auth = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes("${username}:${password}"))

$headers = @{
Authorization = "Basic $base64Auth"
}

$response = Invoke-RestMethod -Uri "https://api.example.com/data" -Headers $headers
$response

#Error handling

try {
$response = Invoke-RestMethod -Uri "https://nonexistent-api.com" -ErrorAction stop
} catch {
Write-Host "An error occurred: $($_.Exception.Message)"
}

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