Toolinium
Mini Postman API Tester
Fast Requests
Instant API response preview
JSON Formatter
Readable formatted responses
Download Support
Save responses instantly
Secure Tool
Browser based API testing
About API Tester
Mini Postman API Tester lets you send GET, POST, PUT and DELETE requests to any REST API and inspect the response instantly, right in your browser. Add custom headers, a JSON body, and see status code, response time and payload size at a glance — a lightweight Postman alternative for quick checks without installing anything.
How To Use
- Enter the API endpoint URL
- Select the request method (GET, POST, PUT, DELETE)
- Add custom headers in JSON format
- Enter a request body if the method requires one
- Click Send Request and view the response instantly
- Copy or download the response for later use
Frequently Asked Questions
Is this tool free?
Yes, the API Tester is completely free to use with no sign-up needed.
Can I send POST, PUT and DELETE requests?
Yes, all four common HTTP methods are supported.
Does it support JSON responses?
Yes, JSON responses are automatically pretty-printed for readability.
Is my request data stored anywhere?
No, requests are sent directly from your browser and nothing is logged or stored.
Related Tools
What does Mini Postman API Tester do?
Test REST APIs online with Toolinium's free API Tester. Send GET, POST, PUT and DELETE requests with headers, JSON body and a response viewer.
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Updated October 11, 2026