API Post - Free Online API Workstation & Testing Client

A high-performance, browser-based API workstation for building, testing, and debugging REST, GraphQL, and WebSocket APIs without mandatory account sign-up.

1. Overview & Core Features

API Post is a modern, lightweight API development workstation engineered for developers, software QA engineers, and system architects. Designed as a zero-overhead alternative to heavy desktop applications like Postman and Insomnia, API Post runs directly in any modern browser at apipost.online as well as a native mobile application on Android.

  • Complete HTTP Method Support: Full support for GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS requests.
  • Dynamic Environment Substitution: Manage global and collection-scoped environment variables using {{variableName}} syntax.
  • cURL Command Importer & Exporter: Import raw cURL commands from terminal or documentation into workstation tabs with 1 click, and export configured requests as executable cURL syntax.
  • Postman Collection Import: Seamlessly import Postman v2.1 collection JSON files to import existing request suites, headers, and endpoints.
  • GraphQL & WebSocket Support: Send GraphQL queries, mutations, and variables, or establish real-time WebSocket socket connections for streaming protocols.
  • Zero Server-Side Storage: All environment keys, headers, collections, and request history remain isolated inside your browser's local storage.

2. Executing REST API Requests

To execute a REST request in API Post, select your HTTP method from the method dropdown selector, enter the target endpoint URL (e.g., https://jsonplaceholder.typicode.com/posts), and configure necessary headers or body payloads.

Headers & Authentication

Specify authorization headers including Bearer Token, Basic Auth, or custom API Keys. Use double curly braces for secret keys, such as Bearer {{API_KEY}}, to prevent hardcoding secret credentials across environments.

Body Payloads & Content-Types

API Post supports multiple request body formats including JSON (application/json), Form-Data, x-www-form-urlencoded, and raw text. The integrated syntax editor highlights JSON structure and formatting errors prior to transmission.

3. cURL Integration & Conversion

cURL (Client URL) is the standard command-line utility for transferring data over network protocols. API Post provides complete bidirectional cURL compatibility:

  • cURL Import: Paste any cURL command string directly into the cURL import modal. API Post automatically parses headers, parameters, and payload into individual workstation fields.
  • cURL Export: Click the cURL export button on any tab to generate a ready-to-run shell snippet for your terminal or documentation.

4. Frequently Asked Questions (FAQ)

Is API Post completely free?

Yes. API Post is 100% free to use for individual developers, software engineering teams, and QA testers without requiring paid subscriptions or login credentials.

Are my API keys and tokens secure?

Yes. All API requests are executed locally from your browser client. Your authorization tokens, request history, and collection data never pass through or get stored on external database servers.