cURL Builder
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Build curl commands from method, URL, headers, and body.
- On your device
- No signup
Private on your device
Your information stays on your device and is not uploaded.
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cURL Formatter
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Parse and format curl commands for readability.
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JSON Formatter
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API Response Formatter
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Pretty-print JSON or XML API responses with auto-detection.
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JWT Decoder
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Decode JWT header, payload, and expiry—including Bearer tokens—on your device.
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Compare two JSON documents and list structural differences.
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XML Formatter
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Format, minify, and validate XML with readable indentation.
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Compare two XML documents and list structural differences.
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Build GET, POST, PUT, PATCH, and DELETE requests with headers, query parameters, and JSON or raw bodies. Inspect status, timing, headers, and response bodies locally. Requests go directly from your browser—there is no Utilnivo proxy, so CORS and mixed-content rules still apply.
How to use this tool
Enter an absolute https URL, choose a method, add headers if needed, and click Run. Copy cURL when you want to reuse the request in a terminal.
Worked example
GET https://httpbin.org/get returns JSON describing the request your browser made.
How it works
Build an HTTP request with method, URL, headers, query parameters, and an optional body, then send it directly from your browser. The response status, headers, timing, and body appear locally. There is no Utilnivo proxy—CORS and mixed-content rules still apply.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data stays on your device and is not uploaded.
FAQ
Frequently asked questions
Is API Tester free?
Yes. It is free to use and you do not need to sign in or create an account.
Is my data private?
See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.
Can I use API Tester on mobile?
Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.
Part of these workflows
This tool is one step in a longer job. Jump straight to your step or open the full workflow guide.
Related pages
- API debugging tools — compare developer tools and read FAQs
- Debug a failing API — step-by-step workflow
- Browse all free online tools on Utilnivo
- Explore more developer tools on Utilnivo
- cURL Builder — Build curl commands from method, URL, headers, and body.
- cURL Formatter — Parse and format curl commands for readability.
- JSON Formatter — Format, minify, and validate JSON with optional key sorting.
- API Response Formatter — Pretty-print JSON or XML API responses with auto-detection.
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