REST Insight is a free, portable HTTP(S) client developed by TMS Software for testing and analyzing REST APIs without writing code. It allows developers to build fully customizable requests, inspect responses, and generate Delphi classes from JSON output. The tool runs on Windows (32/64-bit), macOS (Intel & Apple ARM), and Linux Ubuntu, enabling seamless cross-platform API testing.

Features

• Test REST APIs without code: Quickly craft and send REST API requests with no programming required, allowing developers to interact with endpoints efficiently during exploration or debugging.
• Customizable HTTP(S) requests: Configure headers, methods, parameters, and body content for any API request, providing full flexibility when working with diverse APIs and authentication mechanisms.
• Instant response analysis: Inspect JSON, HTML, images, PDFs, and entire web pages directly within the tool, enabling immediate understanding of API behavior and returned data.
• Response export: Save responses to files for further processing, documentation, or comparison, supporting workflows that require persistent response tracking or auditability.
• JSON → Delphi class generation: Automatically convert REST JSON responses into Delphi classes, significantly accelerating development by reducing the need for manual model creation.
• Save & load configured requests: Reuse frequently tested API calls to maintain consistency across sessions and streamline repetitive testing workflows.
• Theme customization: Enable light or dark mode with OS-level integration to align with personal interface preferences and improve usability.
• Cross‑platform availability: Designed to run on Windows 32/64 bit, macOS (Intel & ARM), and Linux Ubuntu, ensuring maximum flexibility across different development environments.

Benefits

• Boosts developer productivity by eliminating manual coding for API prototyping and model generation.
• Enhances debugging with immediate visibility into complete API responses, including multimedia formats.
• Improves testing accuracy through saved and reusable request templates.
• Supports modern Delphi development with automated class generation from JSON.
• Flexible and portable, allowing use across different operating systems without complex installation.