Online API Testing Tool

HTTP application programming interfaces let systems exchange data quickly and securely. You need dependable tools to inspect requests and responses during development, debugging, or onboarding new endpoints. This page introduces a lightweight, browser‑based interface that helps you compose calls, view live server replies, and iterate faster. One clear workflow reduces context switching and encourages consistent testing habits.

With the online tester you craft queries using familiar form controls, toggle authentication, and add query strings or headers in dedicated tabs. Press one button and a live fetch shows status, headers, and a prettified body instantly. Save frequently used calls locally for repeat work. For example, store a “User‑login POST” to replay while tuning backend validation.

Use this tool when you prototype a new service, reproduce a tricky bug, or document an integration for cross‑functional teammates, ensuring rapid feedback loops and transparent change management throughout staging, testing, and release cycles, but avoid embedding production tokens, personal identifiers, or confidential data in any saved preset to prevent accidental disclosure.

Technical Details:

The tester runs entirely in your browser using the built‑in fetch API and a reactive interface layer. Each click updates state instantly without network latency. Because all processing stays client side, sensitive payloads never leave your machine, and connections occur directly between your browser and the target server.

State objects persist through the browser’s localStorage to support offline reuse. Query, header, and body data assemble into a standards‑compliant request string that mirrors common command‑line tools. The viewer automatically formats JSON responses for readability while leaving other media untouched. You can copy raw bodies for downstream analysis or documentation.

Request Composer

Build any HTTP request quickly with dropdowns and inputs. Example: send a PATCH to update user status. Caution: invalid URLs trigger browser errors without additional guidance.

Query Parameter Builder

Toggle checkboxes to include or exclude each query pair before execution. Example: disable pagination for a full export. Caution: leaving keys blank may generate duplicated ampersands.

Header Manager

Add or remove custom headers directly in a table. Example: set Accept: application/json when testing versioned endpoints. Caution: conflicting content‑type headers may override server negotiation.

Authentication Helper

Switch between None, Basic, or Bearer modes from one select box. Example: paste a JWT to reach protected routes. Caution: clear stored credentials before sharing your screen.

Response Explorer

View status, headers, and prettified bodies in a scrollable panel. Example: copy the response to clipboard for tickets. Caution: large binary data may appear unreadable.

Step‑by‑Step Guide:

Follow these steps to send and inspect your first call.

1. In the Name: field, type a descriptive label such as user‑lookup.
2. Select GET (or another verb) from the method dropdown, then enter the endpoint in the URL box.
3. Click the Params tab and use Add param to append id and a value.
4. Switch to the Headers tab, add Accept → application/json, and ensure the checkbox stays checked.
5. If authentication is required, open Auth, choose Bearer, and paste your token.
6. Press the Send button to execute the request; watch the Response panel populate.
7. Click Save to store the request locally for later reuse.

FAQ:

Find quick answers to common questions.

Troubleshooting:

Resolve frequent issues quickly.

Empty body received: Confirm the endpoint actually returns content and that you selected the correct HTTP verb.

Token expired: Regenerate credentials and re‑paste them in the Auth tab.

Unsupported Media Type 415: Add or correct the Content‑Type header before sending.

Lost preset after browser cleanup: Export important requests regularly; clearing site data removes localStorage entries.

Advanced Tips:

Pursue deeper productivity.

• Use keyboard shortcut Ctrl+Enter to trigger Send instantly.
• Prefix the URL with // to inherit the page’s protocol automatically.
• Combine multiple Authorization schemes by duplicating the header rows for edge‑case tests.
• Paste a full curl command in the URL box to auto‑parse method, headers, and body.
• Pin frequently accessed domains using your browser’s autocomplete for faster typing.

Glossary:

Clarify essential terms.