DEVELOPER TOOLS
Detect Website Tech Stack API
Analyze any website to detect its technology stack — frameworks (Next.js, Nuxt, WordPress, Shopify), hosting (Vercel, Netlify, AWS), analytics (GA, Plausible, Segment), CDNs, CSS frameworks, payment providers, and more. Uses HTTP headers, HTML patterns, and script analysis.
How to call it
Send one POST to api.upapi.io/detect-tech-stack.post with your key in the X-Api-Key header and the parameters below as a JSON body. Each call spends 1 weighted unit of your monthly quota. The operation times out after 25 seconds. Identical requests are served from cache for 3600 seconds, unbilled.
POST https://api.upapi.io/detect-tech-stack.post
Detect Website Tech Stack API reference
Request parameters
- url
- stringrequired — URL to analyze (e.g. https://stripe.com)
Response fields
- url
- stringrequired
- server
- stringrequired
- finalUrl
- stringrequired
- fetchedAt
- stringrequired
- poweredBy
- stringrequired
- statusCode
- integerrequired
- contentType
- stringrequired
- technologies
- arrayrequired
- technologies[].name
- stringrequired
- technologies[].category
- stringrequired
- technologies[].evidence
- stringrequired
- technologies[].confidence
- stringrequired
Example request and response
The example response is generated from this operation’s published output schema — it shows the shape and field names, not values from a recorded call.
{
"url": "https://stripe.com"
}{
"url": "https://github.com",
"server": "example",
"finalUrl": "example",
"fetchedAt": "example",
"poweredBy": "example",
"statusCode": 1,
"contentType": "example",
"technologies": [
{
"name": "example",
"category": "example",
"evidence": "example",
"confidence": "example"
}
]
}Code snippets
cURL
curl -X POST https://api.upapi.io/detect-tech-stack.post \
-H 'Content-Type: application/json' \
-H 'x-api-key: YOUR_API_KEY' \
-d '{ "url": "https://stripe.com" }'JavaScript
const response = await fetch('https://api.upapi.io/detect-tech-stack.post', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'x-api-key': 'YOUR_API_KEY',
},
body: JSON.stringify({
"url": "https://stripe.com"
}),
});
const data = await response.json();
console.log(data);Python
import requests
response = requests.post(
'https://api.upapi.io/detect-tech-stack.post',
headers={
'Content-Type': 'application/json',
'x-api-key': 'YOUR_API_KEY',
},
json={
"url": "https://stripe.com"
},
)
print(response.json())Go
package main
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
)
func main() {
payload := []byte(`{ "url": "https://stripe.com" }`)
req, _ := http.NewRequest("POST", "https://api.upapi.io/detect-tech-stack.post", bytes.NewBuffer(payload))
req.Header.Set("Content-Type", "application/json")
req.Header.Set("x-api-key", "YOUR_API_KEY")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := io.ReadAll(resp.Body)
var result map[string]any
json.Unmarshal(body, &result)
fmt.Println(result)
}PHP
<?php
$payload = json_encode([
'url' => 'https://stripe.com',
]);
$ch = curl_init('https://api.upapi.io/detect-tech-stack.post');
curl_setopt_array($ch, [
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $payload,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => [
'Content-Type: application/json',
'x-api-key: YOUR_API_KEY',
],
]);
$response = curl_exec($ch);
curl_close($ch);
$data = json_decode($response, true);
var_dump($data);Ruby
require 'net/http'
require 'uri'
require 'json'
uri = URI('https://api.upapi.io/detect-tech-stack.post')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == 'https'
request = Net::HTTP::Post.new(uri.path)
request['Content-Type'] = 'application/json'
request['x-api-key'] = 'YOUR_API_KEY'
request.body = { "url": "https://stripe.com" }.to_json
response = http.request(request)
puts JSON.parse(response.body)Java
import okhttp3.*;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.util.Map;
OkHttpClient client = new OkHttpClient();
ObjectMapper mapper = new ObjectMapper();
String json = "{ \"url\": \"https://stripe.com\" }";
RequestBody body = RequestBody.create(json, MediaType.get("application/json"));
Request request = new Request.Builder()
.url("https://api.upapi.io/detect-tech-stack.post")
.post(body)
.addHeader("Content-Type", "application/json")
.addHeader("x-api-key", "YOUR_API_KEY")
.build();
try (Response response = client.newCall(request).execute()) {
Map<?, ?> result = mapper.readValue(response.body().string(), Map.class);
System.out.println(result);
}C#
using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");
var payload = JsonSerializer.Deserialize<object>("{ \"url\": \"https://stripe.com\" }");
var response = await client.PostAsJsonAsync("https://api.upapi.io/detect-tech-stack.post", payload);
var result = await response.Content.ReadFromJsonAsync<JsonElement>();
Console.WriteLine(result);Frequently asked questions
How much does the Detect Website Tech Stack API cost per call?
Each call spends 1 weighted unit of your plan's monthly quota. Full pricing is at https://upapi.io/pricing.
How do I authenticate to the Detect Website Tech Stack API?
Send your key in the X-Api-Key header. A free guest key is available without creating an account.
Are Detect Website Tech Stack API responses cached?
Yes — identical requests are served from cache for 3600 seconds, and a cache hit is not billed.