# Apier – REST API Tester & HTTP Client

> Fast API client for HTTP, GraphQL, SOAP, WebSocket, and Socket.IO. Send requests, inspect responses, and debug APIs directly from your browser.

Canonical page: [https://chrome-stats.com/d/apier](https://chrome-stats.com/d/apier)

## Overview

- **ID:** `apier`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Leepverse
- **Category:** web-development
- **Daily users:** 26
- **Weekly downloads:** 8
- **Version:** 2.1.2
- **Last updated:** 2026-07-17
- **First published:** 2026-04-24
- **Size:** 2.94 MB
- **Data as of:** 2026-09-15
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/apier/)
- **Website:** [https://apier.leepverse.xyz/](https://apier.leepverse.xyz/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/apier/privacy/](https://addons.mozilla.org/firefox/addon/apier/privacy/)

## Description

Apier – Built Light. Runs Fast.

A lightweight API client for developers. Test HTTP, GraphQL, and SOAP APIs, connect to WebSocket and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a> servers, generate cURL commands, organize collections, manage variables, simulate network conditions, install official extensions, and debug APIs directly in your browser.

Apier is built for developers who want a fast, clean, and privacy-focused API client without installing heavy desktop applications.

What is Apier?

Apier is a modern API testing and debugging tool that lets you work with HTTP, GraphQL, SOAP, WebSocket, and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a> from one lightweight workspace.

Everything runs locally in your browser—no accounts, no cloud sync, and no unnecessary complexity.

Features

• HTTP API Testing
- GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
- Query Parameters
- Request Headers
- Cookies
- JSON, XML, Text &amp; Form Data
- File Upload (Multipart)
- Request Body Editor
- Request Cancellation

• GraphQL
- GraphQL Queries
- Variables Support
- Custom Headers
- Response Viewer

• SOAP
- SOAP Request Editor
- XML Request Body
- SOAPAction Header Support
- Custom Headers
- XML Response Viewer

• WebSocket &amp; <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a>
- WebSocket Client
- <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a> Client
- Send &amp; Receive Messages
- Real-time Event Logs

• Response Tools
- Pretty View
- Raw View
- Tree View
- Response Headers
- JSON Export
- XML Export
- TXT Export
- Multi-language Code Generation
- Response Size
- Response Time
- HTTP Status

• Organization
- Collections
- Nested Folders
- Saved Requests
- Request History
- Search &amp; Reuse Requests

• Variables
- Global Variables
- Variable Collections
- Dynamic Variable Replacement
- Reusable Environments

• Developer Tools
- cURL Generator
- Auto Runner
- Request Repetition
- Configurable Delay
- Network Latency Simulation
- Offline Mode

• Extensions
- Official Extension Marketplace
- Install Official Extensions
- Enable or Disable Extensions
- Built-in Productivity Tools
- Expand Apier Functionality

• Personalization
- Multiple Themes
- Avatar Selection
- Light &amp; Dark Mode
- Modern Interface

Privacy

Apier is privacy-first.
<ul><li>No account required</li><li>No cloud storage</li><li>No tracking</li><li>No analytics</li><li>No personal data collection</li><li>All requests, collections, variables, history, settings, and extensions remain on your device</li></ul>
Use Cases
<ul><li>Test HTTP APIs</li><li>Test GraphQL APIs</li><li>Test SOAP Services</li><li>Debug Backend Services</li><li>Connect to WebSocket Servers</li><li>Test <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a> Applications</li><li>Generate cURL Commands</li><li>Export API Responses</li><li>Organize API Collections</li><li>Simulate Network Conditions</li><li>Extend Apier with Official Extensions</li><li>Learn API Development</li></ul>
Whether you're building APIs, debugging backend services, integrating third-party services, or learning web development, Apier provides a fast, lightweight, and developer-friendly workspace for everyday API testing across HTTP, GraphQL, SOAP, WebSocket, and <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/8ba5b7ef5a6c5a1450cc42af480d60667c9f7fb6a5e783b776802e3225beec2f/http%3A//Socket.IO" rel="nofollow">Socket.IO</a>.

## Rankings

- #21,973 — Overall
- #27 — rest
- #135 — response
- #157 — debug

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `cookies`

### Host permissions

- `https://*/*`
- `http://*/*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/apier)