Send GET, POST, PUT or DELETE requests with headers and body, and inspect the response. API Tester is a browser-native developer utility — everything executes in your own tab using standard web APIs, so there is no backend, no account and no usage quota. It is designed for the quick jobs that interrupt real work: checking a response, generating a value, or turning a snippet into something you can share in a ticket or a pull request. Nothing you type is sent to Toolzer's servers, so you can work with internal endpoints, sample payloads and throwaway keys without leaking anything.
How to use API Tester
1
Enter Your Input
Add the request details, source code or generation options you want to work with.
2
Configure the Options
Set the method, headers, theme, length or format so the output matches your project.
3
Generate the Result
Run it — the response, image or key is produced right in your browser tab.
4
Copy or Download
Save the output or copy it into your codebase, documentation or password manager.
Why Use API Tester
API Tester is built for people who want a fast, honest answer without wading through ads, sign-up walls, or feature bloat. Load the page, use the tool, get on with your day. Toolzer's design philosophy is simple: privacy-first (no tracking of your data), instant results, and zero cost.
Tips & Best Practices
1Bookmark this page — API Tester works on any device, so having it one click away saves you a search next time.
2Everything runs in your browser, so you can safely use this tool with private or confidential data.
3If a result looks off, refresh the page and try again — no session state is stored between visits.
Common Use Cases
1Checking an API endpoint quickly while debugging an integration.
2Turning a code snippet into a shareable image for documentation or social posts.
3Generating strong random keys and tokens for environment variables.
4Demonstrating a request or snippet during a code review or tutorial.
5Working with sensitive values safely because generation happens offline in the browser.
Frequently asked questions
Is API Tester free?
Yes, free and unlimited, with no account and no API key.
Does anything I enter reach your servers?
No. The tool runs entirely in your browser, so requests, snippets and generated values stay on your machine.
Can I use it with internal or localhost services?
Only if your browser can reach them and CORS allows it — the request comes from your own browser, not from Toolzer.
Is the output safe for production use?
Generated values use the browser's cryptographic random source, which is suitable for real secrets. Always store them in your platform's secret manager, never in source control.
Does it work on mobile?
Yes, though a desktop browser is more comfortable for longer payloads and code.
Do I need to create an account to use Toolzer?
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Is Toolzer safe to use with sensitive inputs?
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
Does Toolzer work on mobile?
Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser.
Can I link to or bookmark a result?
Yes. Every Toolzer page has a clean permanent URL you can bookmark or share.
