Documentation

JT から glTF への REST API | CADCON

CADCON REST API で Siemens JT ファイルを変換。認証、アップロード、変換状況の確認、glTF・GLB のダウンロードをコード例で解説します。

Authentication

All API requests require an API key sent as a request header. Your API key is available in your Workspace.

Header
X-Api-Key: YOUR_API_KEY
Sign in to see your personal API key in the examples below.

POST /api/convert

Convert a JT file to glTF, GLB, or both formats. Uses 1 credit per conversion.

Parameters

NameTypeRequiredDescription
filefileYesThe .jt file to convert
formatstringNogltf (default), glb, or both

curl

bash
# Convert a JT file to glTF
curl -X POST https://cadcon.io/api/convert \
  -H "X-Api-Key: YOUR_API_KEY" \
  -F "[email protected]" \
  -F "outputFormat=gltf"

JavaScript (fetch)

javascript
const form = new FormData()
form.append('file', fileInput.files[0])
form.append('outputFormat', 'glb')

const res = await fetch('/api/convert', {
  method: 'POST',
  headers: { 'X-Api-Key': 'YOUR_API_KEY' },
  body: form
})
const { gltfUrl, binUrl, glbUrl } = await res.json()

Python

python
import requests

with open('model.jt', 'rb') as f:
    r = requests.post(
        'https://cadcon.io/api/convert',
        headers={'X-Api-Key': 'YOUR_API_KEY'},
        files={'file': f},
        data={'outputFormat': 'glb'}
    )
data = r.json()
print(data['glbUrl'])

Response

json
{
  "jobId": 42,
  "status": "Completed",
  "fileName": "model",
  "gltfUrl": "/api/files/<token>",
  "binUrl":  "/api/files/<token>",
  "glbUrl":  null
}

GET /api/jobs

Returns your 20 most recent completed conversions with download URLs.

curl

bash
# List previous conversions
curl https://cadcon.io/api/jobs \
  -H "X-Api-Key: YOUR_API_KEY"

Response

json
[
  {
    "id": 42,
    "originalFileName": "part.jt",
    "outputFormat": "gltf",
    "completedAt": "2025-06-01T10:30:00Z",
    "creditsUsed": 1,
    "gltfUrl": "/api/files/<token>",
    "binUrl":  "/api/files/<token>",
    "glbUrl":  null
  }
]

GET /api/files/{token}

Download a converted file using the token returned by /api/convert or /api/jobs. Tokens expire after 24 hours.

bash
curl https://cadcon.io/api/files/<token> \
  -H "X-Api-Key: YOUR_API_KEY" \
  -o model.gltf

.NET NuGet Package

Use the Cadcon.Conversion NuGet package to convert JT files locally in your .NET application — no HTTP calls, no file uploads. One credit is deducted per conversion via the Cadcon API.

Install

bash
dotnet add package Cadcon.Conversion

Convert locally (offline)

csharp
using Cadcon.Conversion;

var converter = new JtConverter();
var result = converter.Convert("part.jt", "part.glb", new JtConversionOptions { WriteGlb = true });

if (result.Success)
    Console.WriteLine($"Done: {result.VertexCount} verts, {result.TriangleCount} tris");
else
    Console.WriteLine($"Error: {result.ErrorMessage}");

Convert with API key (metered)

Validate your key and fetch credits on startup, then deduct 1 credit per conversion.

csharp
using Cadcon.Conversion;

// Validate key + fetch credits on startup
var client = await CadconApiClient.CreateAsync("YOUR_API_KEY");
Console.WriteLine($"Credits: {client.Credits}");

// 1 credit deducted per Convert() call
var converter = new JtConverter(client);
var result = converter.Convert("part.jt", "part.glb", new JtConversionOptions { WriteGlb = true });
Console.WriteLine($"Credits remaining: {client.Credits}");

View on NuGet.org →

Error Codes

StatusMeaning
400Bad request — invalid file or parameters
401Unauthorized — missing or invalid API key
402Payment required — insufficient credits
500Conversion failed — see error message