Compare: Talend API Tester - Free Edition vs JSON Formatter

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Metric	Talend API Tester - Free Edition	JSON Formatter
User count	600,000	2,000,000
Average rating	4.76	4.27
Rating count	4,340	2,084
Last updated	2026-06-10	2026-05-16
Size	5.05 MB	0.02 MB
Version	25.17.0	0.10.2

Short description	Test and validate REST, SOAP, and HTTP APIs visually with Talend API Tester - Free Edition. Send requests, inspect responses, and manage your API projects easily.	Prettify and explore JSON in your browser with fast performance, dark mode, syntax highlighting, code folding, and convenient raw/parsed views.
Full summary	Talend API Tester - Free Edition is a powerful Chrome extension that enables developers and testers to visually interact with REST, SOAP, and HTTP APIs. Formerly known as Restlet Client, this tool simplifies sending requests and inspecting responses with an easy-to-use graphical interface. Users can handle all HTTP requests, including dynamic ones using variables, and fully support security and authentication features. The extension offers robust API validation through assertions on response headers, status, body, and response time. It also supports organizing requests into projects, viewing call history, and importing collections from popular API formats like Postman Collections and OpenAPI specs. With multiple response visualization options (JSON, XML, HTML, images), Talend API Tester streamlines API testing and debugging workflows, making it an essential tool for developers, QA engineers, and API consumers.	JSON Formatter automatically prettifies any JSON response opened in a browser tab, delivering fast rendering even for very long files with dark mode support. Enjoy features like syntax highlighting, code folding with indent guides, clickable URLs, and a raw/parsed toggle. The extension supports Code.org and may involve affiliate commissions that become donations to a charity of your choice.