API Tester
Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body.
Use the API Tester
Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body.
Calculations and transformations happen locally in your browser. The API Tester sends only the request you explicitly ask it to send to the URL you enter.
Local browser utility. Review transformed or calculated output before using it in production, procurement, publication or operational decisions.
How to use it
Start with the worked example, replace it with your real inputs, inspect the result and supporting details, then copy only after you have checked the assumptions or transformed output.
How the API Tester works
Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body. The methodology below explains the actual production transformation, the verified QA fixture and the support boundaries that prevent the page from overstating what it does.
Calculation breakdown
ToolLott will explain the current inputs and displayed result here.
Process the supplied data using the documented production transformation
The API Tester follows a deterministic production workflow using HTTP method, Request URL, Headers as JSON, Request body. It validates the supplied inputs, performs this tool-specific operation — Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body — and reports the verified result “Request ready: POST https://api.example.test/orders” without silently changing unsupported cases.
| Symbol / input | Meaning | Unit |
|---|---|---|
method | HTTP method | user input |
url | Request URL | user input |
headers | Headers as JSON | user input |
body | Request body | user input |
Step-by-step method
- Validate the required text, file, coordinates, options or output settings before processing.
- Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body.
- Return the production summary or downloadable artifact, while keeping unsupported formats, syntax or edge cases visible rather than silently guessing.
Worked example
Ethan, a web developer, A developer is preparing a POST /orders integration request with JSON body {sku: PUMP-0427-A, quantity: 2} and explicit JSON/test headers, and wants to inspect the exact browser request before pointing it at the staging API.
Example inputs
- HTTP method: POST
- Request URL: https://api.example.test/orders
- Headers as JSON: {"Content-Type":"application/json","X-Test":"ToolLott"}
- Request body: {"sku":"PUMP-0427-A","quantity":2}
Calculation / processing
Use the verified QA fixture: HTTP method: POST; Request URL: https://api.example.test/orders; Headers as JSON: {"Content-Type":"application/json","X-Test":"ToolLott"}; Request body: {"sku":"PUMP-0427-A","quantity":2}.Run the production API Tester workflow using the documented production transformation for the supplied data.The production QA case reports: Request ready: POST https://api.example.test/orders.
This verified result shows what the API Tester produces for the stated scenario. Interpret it together with the inputs, assumptions and limitations instead of treating the displayed summary as context-free advice.
Assumptions
- Input text/data follows the syntax, coordinate or formatting conventions stated on the page.
- Processing uses the browser/runtime features documented by ToolLott; no hidden correction is assumed unless the tool explicitly performs it.
Limitations
- Browser requests are limited to explicit HTTP or HTTPS URLs; browser CORS and target-server policy still apply.
- Formatting, testing and transformation utilities cannot prove application-level correctness, security or interoperability beyond the documented operation.
- Browser, encoding, coordinate-datum, syntax and environment edge cases can require separate validation in the target system.
Common questions
What does the API Tester actually calculate or change?
Compose and send an HTTP request directly from your browser, with explicit method, URL, headers and body. The methodology describes the production relationship or transformation rather than a generic description.
Does the worked example match the real ToolLott tool?
Yes. The example is linked to the production QA fixture for Build 0169, including its expected summary.
What should I check before relying on the output?
Review the stated assumptions, support boundaries and source references, and independently verify any result used for financial, engineering, legal, archival or production decisions.
Methodology sources
Related ToolLott tools
A realistic way Ethan could use this tool
Ethan is a web developer.
A developer is preparing a POST /orders integration request with JSON body {sku: PUMP-0427-A, quantity: 2} and explicit JSON/test headers, and wants to inspect the exact browser request before pointing it at the staging API.
Ethan runs the example with method = “POST”; URL = “https://api.example.test/orders”; headers = “{"Content-Type":"application/json","X-Test":"ToolLott"}”; body = “{"sku":"PUMP-0427-A","quantity":2}”. Processing that specific set gives Request ready: POST https://api.example.test/orders, making the result reproducible instead of relying on a generic claim about what the tool should do.
For this scenario, Request ready: POST https://api.example.test/orders. Ethan can use that specific result to inspect the exact browser request before pointing it at the staging API, while keeping the stated assumptions separate from the calculation itself. The page also keeps this limitation explicit: Browser-local utility.
Fictional scenario using realistic example data. For Ready tools, the worked result is tied to the tested example shown in the tool. Replace the figures with your own inputs and independently verify important professional, financial, legal, health or safety decisions.
What this tool is for
Use it to send HTTP API requests and inspect response status, headers and body.
It sits within ToolLott’s Developer Tools collection, where you can also test APIs and regex, encode Base64, format code and markup, minify CSS/JavaScript, generate hashes, UUIDs and cron expressions.