Documentation

JT to glTF REST API | CADCON

Convert Siemens JT files with the CADCON REST API. Authentication, upload, conversion status and glTF or GLB downloads, with code examples.

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