Introduction

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Getting Started

Visit the ProbeCore API testing interface via the browser. Begin creating and sending requests without registration or setup. All functionalities are accessible immediately and operate fully within the browser environment.

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Key Capabilities

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Comprehensive HTTP Method Support

ProbeCore supports all standard HTTP methods:

• GET: Retrieve data
• POST: Create new resources
• PUT: Replace existing resources
• DELETE: Remove resources
• PATCH: Modify resources partially
• OPTIONS: Identify supported methods
• HEAD: Retrieve headers without body content

Users can select the desired method within the request interface for full flexibility during test execution.

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Tabbed Request Interface

Multiple request tabs allow concurrent testing workflows without losing progress. This structure supports productivity and ease of comparison between requests.

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Request History

Requests are stored locally within the browser, enabling retrieval, review, and reuse of past interactions without cloud dependencies.

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Collection Management

• Export collections in standard JSON format for backup or version control.
• Import collections from other tools.
• Easily share API scenarios with team members or collaborators.

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Authorization Support

ProbeCore supports the following authorization mechanisms:

• No Authorization
• Bearer Token
• Basic Authentication
• API Key (header, query)
• Custom-defined authorization headers

Authorization can be configured in the dedicated Auth panel.

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Query Parameter Management

• Add, remove, and manage key-value pairs
• Enable or disable parameters per request
• Bulk edit mode
• Built-in URL encoding
• Array parameter support

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Advanced Response Rendering

JSON responses are presented using structured formatting and syntax highlighting, improving readability and debugging efficiency.

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Protocol-Level Controls

Advanced settings per request include:

• HTTP version selection (1.1 or 2.0)
• SSL certificate verification toggle
• Automatic redirect handling
• Redirect method and header retention
• HTTP parser behavior
• URL encoding enforcement
• Cookie storage management
• Cipher suite configuration
• Redirect limit settings
• Protocol enablement/disabling (e.g., TLS versions)

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No Account Requirement

No user registration is necessary. All features are accessible instantly without submitting personal data.

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Pricing

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Free Forever

There are no usage tiers or hidden costs. The full feature set is available at no charge, including:

• Unlimited API requests
• Multiple tab support
• Request history
• Collection export/import
• Advanced authorization types
• Query parameter management
• SSL verification
• No rate limits
• No account required

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About ProbeCore

ProbeCore was developed to provide developers—regardless of budget or experience—with unrestricted access to high-quality API testing tools. The platform is built for performance, privacy, and usability, removing unnecessary friction from the development process.

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Mission Statement

To make API testing accessible, efficient, and privacy-respecting for all developers, without imposing costs or registration barriers.

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Core Values

• Free Access: All features available with no subscription required.
• Privacy First: No data is transmitted to external servers; everything remains local.
• Developer-Centric: Designed by developers to meet actual API testing needs.
• High Performance: Optimized for responsiveness and speed within browser constraints.

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API Tester Example:

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Without Request Body

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With Request Body

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Feature Comparison Table

• ULD = Unlimited (Self-Hosted only)

Feature	ProbeCore	Postman
No account required	✅	❌
Unlimited API requests	✅	Limited in free tier
All HTTP methods supported	✅	✅
Multiple tab support	✅	✅
Request history (local)	✅	✅
Collection export/import	✅	✅
JSON syntax highlighting	✅	✅
Advanced SSL and HTTP controls	✅	✅
Bearer, Basic, API Key auth	✅	✅
Custom authorization headers	✅	❌
Query parameter management	✅	✅
Dark/light theme support	✅	✅
Real-time in-browser execution	✅	✅
Rate limits	None	Yes (in free tier)
Pricing	Free	Free tier available, Paid tiers for advanced features
API Client Support (HTTP)	✅	✅
Custom headers support	✅	✅
SSL certificate verification	✅	✅
(Windows/Mac/Linux) App	❌	✅
Self Hosted	✅	❌