API Client Pro

Advanced REST API Testing Tool

A comprehensive REST API testing tool that allows you to send HTTP requests, manage collections, configure environments with variables, and generate code snippets.

AdvancedAPIGenerator

Getting Started

The API Client Pro allows you to test REST APIs directly from your browser. To make a request, simply enter the URL, select the HTTP method, and click Send.

Quick Start Steps:

Enter a URL in the address bar (e.g., https://jsonplaceholder.typicode.com/posts/1)
Select the HTTP method (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
Add any required headers or body content
Click the Send button or press Ctrl + Enter
View the response in the Response tab

Request Builder

The Request Builder is the main interface for creating and sending HTTP requests. It supports various HTTP methods, headers, request body, and authentication.

HTTP Methods

The following HTTP methods are supported:

GET - Retrieve data

POST - Create resource

PUT - Update resource

DELETE - Remove resource

PATCH - Partial update

HEAD - Headers only

OPTIONS - Capabilities

Headers

Add custom headers to your request using the Headers tab. Common headers include:

Content-Type: application/json
Authorization: Bearer token
Accept: application/json
X-API-Key: your-api-key

Request Body

For POST, PUT, and PATCH requests, you can include a request body. The tool supports JSON, XML, and plain text formats.

{
  "title": "New Post",
  "body": "This is a new post",
  "userId": 1
}

Response Viewer

The Response Viewer displays the API response with detailed information including status code, headers, response body, and performance metrics.

Response Tabs

Body

Displays the response body in a formatted JSON viewer with syntax highlighting and search functionality.

Headers

Shows all response headers with key-value pairs for debugging and inspection.

Metrics

Provides detailed performance metrics including response time, size, and status.

Raw

Shows the raw, unformatted response data for debugging purposes.

Status Codes

Response status codes are color-coded for quick identification:

2xx - Success

3xx - Redirection

4xx - Client Error

5xx - Server Error

Collections

Collections help you organize your API requests into logical groups. You can create multiple collections, add requests to them, and export/import collections.

Creating a Collection

Click on the Collections tab in the sidebar
Click "New Collection"
Enter a name and optional description
Click "Create Collection"

Adding Requests to Collections

Save your current request to a collection for later use. This helps you build a library of reusable API requests organized by functionality.

Export & Import

You can export your collections to JSON files for backup or sharing, and import them back later.

Environments & Variables

Environments allow you to define variables and configuration that can be substituted in your requests. This is useful for managing different environments like development, staging, and production.

Variable Substitution

Use {{VARIABLE_NAME}} syntax to reference variables in your requests:

URL: https://{{BASE_URL}}/api/users
Headers:
  Authorization: Bearer {{ACCESS_TOKEN}}
Body:
{
  "name": "{{USER_NAME}}",
  "email": "{{USER_EMAIL}}"
}

Creating an Environment

Click "Environment" in the request builder
Click "New Environment"
Enter a name (e.g., "Development", "Production")
Add variables with keys and values
Optionally mark variables as secrets (values are hidden)
Click "Create Environment"

Variable Types

Regular Variables

Standard variables that are visible and can be used in any part of the request.

Secret Variables

Sensitive variables (like API keys) that are masked with asterisks for security.

Authentication

Configure authentication settings at the environment level to automatically include authentication headers in your requests.

Authentication Types

Bearer Token

JWT or API token in Authorization header. Adds:
Authorization: Bearer [token]

Basic Auth

Username and password authentication. Adds:
Authorization: Basic [base64(username:password)]

API Key

API key in header or query parameter. Adds:
[KeyName]: [value] or ?[KeyName]=[value]

OAuth 2.0

OAuth 2.0 access token. Adds:
Authorization: [TokenType] [accessToken]

Code Generation

Generate code snippets in multiple programming languages from your configured request. This helps you integrate API calls directly into your projects.

Supported Languages

cURL

JavaScript (Fetch)

Python (Requests)

Node.js (HTTPS)

Go (net/http)

Ruby (Net::HTTP)

Example cURL Output:

curl -X GET "https://jsonplaceholder.typicode.com/posts/1"   -H "Accept: application/json"

Request History

All API requests are automatically saved to history, allowing you to revisit previous requests and their responses. You can filter and search through your history.

Features

Automatic recording of all requests and responses
Filter by HTTP method (GET, POST, etc.)
Filter by status (Success 2xx, Error 4xx/5xx)
Search through history entries
Quick reload of previous requests
Export and import history
Clear history option

Request Templates

Pre-built request templates for common API scenarios. Use these as starting points for your own requests or as examples of proper request configuration.

GETJSON API GET

Basic GET request with JSON headers

POSTJSON API POST

Create new resource with JSON payload

GETBearer Auth GET

GET request with Bearer token authentication

POSTGraphQL Query

GraphQL query request

POSTFile Upload

Multipart form data file upload

POSTWebhook Test

Test webhook endpoint

Performance Metrics

View detailed performance metrics for your API requests including response time, response size, and performance ratings.

Metrics Displayed

Response Time

Total time taken to receive the response. Performance ratings:

< 200ms - Excellent
200-500ms - Good
500-1000ms - Fair
> 1000ms - Slow

Response Size

Size of the response body in KB or MB. Helps identify large responses that may impact performance.

Keyboard Shortcuts

Speed up your workflow with these keyboard shortcuts:

Action	Shortcut
Send Request	`Ctrl` + `Enter`
New Request	`Ctrl` + `N`
Toggle Theme	`Ctrl` + `D`
Switch to Request Tab	`Ctrl` + `1`
Switch to Response Tab	`Ctrl` + `2`
Switch to Code Tab	`Ctrl` + `3`

Related Tools

WebSocket Tester

Test WebSocket connections for real-time communication

GraphQL Generator

Generate GraphQL queries and mutations

← Back to Documentation Open Tool

API Client Pro

Advanced REST API Testing Tool

A comprehensive REST API testing tool that allows you to send HTTP requests, manage collections, configure environments with variables, and generate code snippets.

AdvancedAPIGenerator

Getting Started

The API Client Pro allows you to test REST APIs directly from your browser. To make a request, simply enter the URL, select the HTTP method, and click Send.

Quick Start Steps:

Enter a URL in the address bar (e.g., https://jsonplaceholder.typicode.com/posts/1)
Select the HTTP method (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
Add any required headers or body content
Click the Send button or press Ctrl + Enter
View the response in the Response tab

Request Builder

The Request Builder is the main interface for creating and sending HTTP requests. It supports various HTTP methods, headers, request body, and authentication.

HTTP Methods

The following HTTP methods are supported:

GET - Retrieve data

POST - Create resource

PUT - Update resource

DELETE - Remove resource

PATCH - Partial update

HEAD - Headers only

OPTIONS - Capabilities

Headers

Add custom headers to your request using the Headers tab. Common headers include:

Content-Type: application/json
Authorization: Bearer token
Accept: application/json
X-API-Key: your-api-key

Request Body

For POST, PUT, and PATCH requests, you can include a request body. The tool supports JSON, XML, and plain text formats.

{
  "title": "New Post",
  "body": "This is a new post",
  "userId": 1
}

Response Viewer

The Response Viewer displays the API response with detailed information including status code, headers, response body, and performance metrics.

Response Tabs

Body

Displays the response body in a formatted JSON viewer with syntax highlighting and search functionality.

Headers

Shows all response headers with key-value pairs for debugging and inspection.

Metrics

Provides detailed performance metrics including response time, size, and status.

Raw

Shows the raw, unformatted response data for debugging purposes.

Status Codes

Response status codes are color-coded for quick identification:

2xx - Success

3xx - Redirection

4xx - Client Error

5xx - Server Error

Collections

Collections help you organize your API requests into logical groups. You can create multiple collections, add requests to them, and export/import collections.

Creating a Collection

Click on the Collections tab in the sidebar
Click "New Collection"
Enter a name and optional description
Click "Create Collection"

Adding Requests to Collections

Save your current request to a collection for later use. This helps you build a library of reusable API requests organized by functionality.

Export & Import

You can export your collections to JSON files for backup or sharing, and import them back later.

Environments & Variables

Environments allow you to define variables and configuration that can be substituted in your requests. This is useful for managing different environments like development, staging, and production.

Variable Substitution

Use {{VARIABLE_NAME}} syntax to reference variables in your requests:

URL: https://{{BASE_URL}}/api/users
Headers:
  Authorization: Bearer {{ACCESS_TOKEN}}
Body:
{
  "name": "{{USER_NAME}}",
  "email": "{{USER_EMAIL}}"
}

Creating an Environment

Click "Environment" in the request builder
Click "New Environment"
Enter a name (e.g., "Development", "Production")
Add variables with keys and values
Optionally mark variables as secrets (values are hidden)
Click "Create Environment"

Variable Types

Regular Variables

Standard variables that are visible and can be used in any part of the request.

Secret Variables

Sensitive variables (like API keys) that are masked with asterisks for security.

Authentication

Configure authentication settings at the environment level to automatically include authentication headers in your requests.

Authentication Types

Bearer Token

JWT or API token in Authorization header. Adds:
Authorization: Bearer [token]

Basic Auth

Username and password authentication. Adds:
Authorization: Basic [base64(username:password)]

API Key

API key in header or query parameter. Adds:
[KeyName]: [value] or ?[KeyName]=[value]

OAuth 2.0

OAuth 2.0 access token. Adds:
Authorization: [TokenType] [accessToken]

Code Generation

Generate code snippets in multiple programming languages from your configured request. This helps you integrate API calls directly into your projects.

Supported Languages

cURL

JavaScript (Fetch)

Python (Requests)

Node.js (HTTPS)

Go (net/http)

Ruby (Net::HTTP)

Example cURL Output:

curl -X GET "https://jsonplaceholder.typicode.com/posts/1"   -H "Accept: application/json"

Request History

All API requests are automatically saved to history, allowing you to revisit previous requests and their responses. You can filter and search through your history.

Features

Automatic recording of all requests and responses
Filter by HTTP method (GET, POST, etc.)
Filter by status (Success 2xx, Error 4xx/5xx)
Search through history entries
Quick reload of previous requests
Export and import history
Clear history option

Request Templates

Pre-built request templates for common API scenarios. Use these as starting points for your own requests or as examples of proper request configuration.

GETJSON API GET

Basic GET request with JSON headers

POSTJSON API POST

Create new resource with JSON payload

GETBearer Auth GET

GET request with Bearer token authentication

POSTGraphQL Query

GraphQL query request

POSTFile Upload

Multipart form data file upload

POSTWebhook Test

Test webhook endpoint

Performance Metrics

View detailed performance metrics for your API requests including response time, response size, and performance ratings.

Metrics Displayed

Response Time

Total time taken to receive the response. Performance ratings:

< 200ms - Excellent
200-500ms - Good
500-1000ms - Fair
> 1000ms - Slow

Response Size

Size of the response body in KB or MB. Helps identify large responses that may impact performance.

Keyboard Shortcuts

Speed up your workflow with these keyboard shortcuts:

Action	Shortcut
Send Request	`Ctrl` + `Enter`
New Request	`Ctrl` + `N`
Toggle Theme	`Ctrl` + `D`
Switch to Request Tab	`Ctrl` + `1`
Switch to Response Tab	`Ctrl` + `2`
Switch to Code Tab	`Ctrl` + `3`

Related Tools

WebSocket Tester

Test WebSocket connections for real-time communication

GraphQL Generator

Generate GraphQL queries and mutations

← Back to Documentation Open Tool

API Client Pro

Table of Contents

Getting Started

Quick Start Steps:

Request Builder

HTTP Methods

Headers

Request Body

Response Viewer

Response Tabs

Body

Headers

Metrics

Raw

Status Codes

Collections

Creating a Collection

Adding Requests to Collections

Export & Import

Environments & Variables

Variable Substitution

Creating an Environment

Variable Types

Regular Variables

Secret Variables

Authentication

Authentication Types

Bearer Token

Basic Auth

API Key

OAuth 2.0

Code Generation

Supported Languages

Example cURL Output:

Request History

Features

Request Templates

Performance Metrics

Metrics Displayed

Response Time

Response Size

Keyboard Shortcuts

Related Tools

WebSocket Tester

GraphQL Generator

API Client Pro

Table of Contents

Getting Started

Quick Start Steps:

Request Builder

HTTP Methods

Headers

Request Body

Response Viewer

Response Tabs

Body

Headers

Metrics

Raw

Status Codes

Collections

Creating a Collection

Adding Requests to Collections

Export & Import

Environments & Variables

Variable Substitution

Creating an Environment

Variable Types

Regular Variables

Secret Variables

Authentication

Authentication Types

Bearer Token

Basic Auth

API Key

OAuth 2.0

Code Generation

Supported Languages

Example cURL Output:

Request History