Is the ZeeSharp API Tester free to use?

Yes, completely free with no sign-up required for basic use. It works directly in your browser and sends requests through our server-side proxy so you don't need any software installed.

Does this tool bypass CORS restrictions?

Yes. Requests are routed through a server-side proxy (not your browser), so Cross-Origin Resource Sharing (CORS) restrictions that normally block browser-to-API requests do not apply here.

Is my request data stored or logged?

Requests are proxied in real time and not persisted on our servers. History, saved requests and variables are stored only in your browser's localStorage — never uploaded anywhere.

What HTTP methods are supported?

GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS are all supported, along with custom headers, authentication and a request body for methods that support one.

Can I test APIs that require authentication?

Yes. The Auth tab supports Bearer Token, Basic Auth (username/password) and a custom API Key header — each automatically builds the correct Authorization or custom header for you.

Can I save requests for later use?

Yes. Click Save in the toolbar to name and store the current request (method, URL, headers, body, auth). Saved requests and your last 30 sent requests (History) are both kept in your browser and reload with one click.

What are variables / the {{placeholder}} syntax for?

Variables let you define reusable values like {{baseUrl}} or {{token}} once in the Variables panel, then reference them anywhere in the URL, headers or body using double curly braces. They are substituted automatically right before the request is sent — useful for switching between environments without editing every field.

Can I test localhost or internal/private APIs?

No. For security, requests to private and internal IP ranges (localhost, 127.0.0.1, 192.168.x.x, 10.x.x.x, etc.) are blocked by the server proxy. Use this tool for public-facing APIs only; test local APIs with Postman, Insomnia or curl on your own machine.

How is this different from Postman or Insomnia?

ZeeSharp's API Tester runs entirely in the browser with no installation, account or desktop app required. It covers the core workflow — headers, auth, body, params, history, variables, timing and code generation — making it ideal for quick checks, sharing a link, or testing from a machine where you can't install software. Postman/Insomnia offer deeper features like collection runners, mock servers and team workspaces for larger projects.

Can I generate code from my request?

Yes. The Code tab in the response panel generates a ready-to-use snippet in cURL, JavaScript (fetch), Python (requests), Node.js (axios) and PHP (cURL) — matching your exact method, URL, headers and body.

What is the response timing breakdown?

Each response shows a breakdown of DNS lookup, TCP connect, TLS handshake, time-to-first-byte (TTFB) and content download time — helpful for diagnosing whether slowness comes from DNS, network latency, TLS negotiation or the server itself.

Free API Tester – Send GET/POST/PUT/DELETE Online

Request workspace

Configure, send and inspect a public HTTP endpoint from one focused workspace.

Private ranges blocked

🛡️Protect production credentials. Use scoped test tokens whenever possible. Secrets entered here are sent to the selected public endpoint through ZeeSharp's proxy; do not use administrator keys or long-lived credentials.

Type:

Add assertions to automatically check the response after each request.

What Is the ZeeSharp API Tester?

The ZeeSharp API Tester is a free, browser-based REST client for sending HTTP requests to any public API endpoint and inspecting the response in detail. It's built for developers, QA engineers and students who need to quickly check an API — verify a status code, debug a CORS issue, inspect response headers, or grab a working code snippet — without installing Postman, Insomnia or any desktop application.

Because requests are routed through a server-side proxy rather than directly from your browser, CORS restrictions don't apply, and you can test third-party APIs that would otherwise be blocked by the browser's same-origin policy. Nothing you send is logged on our servers; request history, saved requests and variables live entirely in your browser's local storage.

Key Features

🌐

All HTTP Methods

GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS — each with full header, auth and body support where applicable.

🔓

CORS-Free Proxy

Requests are sent server-side, so cross-origin restrictions that block direct browser calls never apply here.

🔑

Built-in Auth

Bearer Token, Basic Auth and API Key headers are generated automatically — no manual header formatting needed.

🧩

Params & Variables

Edit query params in a key/value table that syncs with the URL, and reuse values everywhere with {{variables}}.

🕘

History & Saved Requests

Your last 30 requests are kept automatically; save important ones with a name to reload them anytime.

✨

JSON Beautify & Validate

One-click JSON formatting with a live valid/invalid badge as you type the request body.

⏱️

Timing Breakdown

See DNS lookup, TCP connect, TLS handshake, time-to-first-byte and download time for every response.

💻

Code Generation

Instantly copy your request as cURL, JavaScript fetch, Python requests, Node.js axios or PHP cURL.

✅

Test Assertions

Add simple checks — status code, response time, body contains, header exists — and see pass/fail after every send.

How to Test an API Request

Choose the HTTP method (GET, POST, PUT, PATCH, DELETE, HEAD or OPTIONS).
Enter the endpoint URL — query parameters can be typed directly in the URL or added in the Params tab.
Add any required headers, or use the Auth tab for Bearer Token, Basic Auth or an API Key.
For POST/PUT/PATCH requests, switch to the Body tab, pick a content type and enter the payload — click Beautify to format JSON.
Click Send and review the status code, timing, headers, cookies and formatted body. Open the Code tab to copy a ready-to-use snippet in your language of choice.

Safer API Testing Practices

An API tester can transmit exactly what you place in the URL, headers and body. Treat request configuration as sensitive and use test environments for destructive methods such as PUT, PATCH and DELETE.

Use limited credentials

Prefer short-lived, least-privilege test tokens. Avoid production administrator keys and personal access tokens with broad scopes.

Verify the destination

Check the hostname before sending. Variables can change the resolved URL, so review the preview shown under the request bar.

Make writes repeatable

Use idempotency keys where supported and test write requests against disposable records before touching important data.

Understanding the Response

A 2xx status usually indicates success, 3xx indicates redirection, 4xx means the request needs attention, and 5xx indicates a server-side failure. A successful HTTP status does not guarantee the returned data is correct—use assertions to verify the expected status, headers, response time and body content.

The timing chart separates network setup from server processing. A high DNS or connection time suggests a network path issue, while a high time-to-first-byte commonly points to work happening at the destination server.

API Tester vs Postman vs Insomnia

Capability	ZeeSharp API Tester	Postman	Insomnia
Installation required	No — runs in browser	Desktop app / account	Desktop app
CORS-free testing	Yes (server proxy)	Yes (desktop app)	Yes (desktop app)
Headers, Auth, Body, Params	Yes	Yes	Yes
Request history & saved requests	Yes (local)	Yes (cloud)	Yes (local/cloud)
Code generation	cURL, JS, Python, Node, PHP	20+ languages	Several languages
Collection runner / CI	Not available	Yes	Yes
Mock servers / team workspaces	Not available	Yes (paid tiers)	Limited
Best for	Quick checks, sharing a link, no-install environments	Large teams, complex workflows	Power users wanting a lightweight desktop client

API Request Tester