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Tools.Town
Free Online Tools for Everyone

Border Radius Generator API

Visually craft CSS border-radius with per-corner sliders, live preview, unit toggle (px/em/rem/%), and shorthand collapsing.

Category: Design Endpoint: /v1/design/border-radius Method: POST Auth: API Key

Fast & Accurate

Get precise results instantly.

Easy Integration

Simple REST API with JSON response.

Developer Friendly

Clear docs and SDK examples.

Free to Start

5,000 free requests/month.

Endpoint

All requests should be made to the following endpoint:

POST https://api.tools.town/v1/design/border-radius

Authentication

This endpoint requires an API Key. Include your API key in the request header.

Authorization: Bearer YOUR_API_KEY
You can get your API key from your dashboard.

Request Parameters

Send a POST request with JSON body.

Parameter Type Required Description Example
tl number The tl parameter. 100
tr number The tr parameter. 100
br number The br parameter. 100
bl number The bl parameter. 100
unit enum The unit parameter. px

Example Request

curl -X POST "https://api.tools.town/v1/design/border-radius" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tl": 100,
    "tr": 100,
    "br": 100,
    "bl": 100,
    "unit": "px"
  }'

Example Response 200 OK

application/json
{
  "success": true,
  "data": {
    "longhand": "string",
    "shorthand": "string",
    "cssRule": "string"
  }
}

Error Codes

Code Meaning
400 Bad Request — missing or invalid parameter
401 Unauthorized — API key missing or invalid
429 Rate limit exceeded — free tier: 5,000 requests/month
500 Internal Server Error — try again or contact support