Embed Validator API — CUB SOFTWARE Developer

Base URL

Base https://cubsoftware.site

Authentication

No API key required — this endpoint is publicly accessible.

Please include a descriptive User-Agent header identifying your app.

Embed Validator

GETPOST /api/embed/validate Discord

Check an embed against every limit Discord enforces, before it rejects it.

Parameter	Type	Required	Description
json	string	required	The embed JSON to check. May also be sent as a POST body.

Example Response

{
  "limits": {
    "author.name": 256,
    "description": 4096,
    "field.name": 256,
    "field.value": 1024,
    "fields": 25,
    "footer.text": 2048,
    "title": 256,
    "total": 6000
  },
  "problems": [],
  "total_characters": 2,
  "valid": true
}

curl 'https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D'
const res  = await fetch('https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D');
const data = await res.json();
console.log(data.valid, data.problems);
const https = require('https');

https.get('https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D', (res) => {
    let body = '';
    res.on('data', chunk => body += chunk);
    res.on('end', () => {
        const data = JSON.parse(body);
        console.log(data.valid, data.problems);
    });
});
import requests

res  = requests.get('https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D')
data = res.json()
print(data['valid'], data['problems'])
<?php
$res  = file_get_contents('https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D');
$data = json_decode($res, true);
echo $data['valid'], $data['problems'];
package main

import (
    "encoding/json"
    "fmt"
    "io"
    "net/http"
)

func main() {
    resp, _ := http.Get("https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D")
    defer resp.Body.Close()
    body, _ := io.ReadAll(resp.Body)
    var data map[string]any
    json.Unmarshal(body, &data)
    fmt.Println(data["valid"], data["problems"])
}
using System.Net.Http.Json;

var client = new HttpClient();
var data   = await client.GetFromJsonAsync<Dictionary<string, object>>(
    "https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D"
);
Console.WriteLine(data["valid"]);
Console.WriteLine(data["problems"]);
import java.net.URI;
import java.net.http.*;
import java.util.Map;
import com.fasterxml.jackson.databind.ObjectMapper;

var client = HttpClient.newHttpClient();
var req    = HttpRequest.newBuilder()
    .uri(URI.create("https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D"))
    .build();
var res  = client.send(req, HttpResponse.BodyHandlers.ofString());
var data = new ObjectMapper().readValue(res.body(), Map.class);
System.out.println(data.get("valid"));
System.out.println(data.get("problems"));
require 'net/http'
require 'json'

uri  = URI('https://cubsoftware.site/api/embed/validate?json=%7B%22title%22%3A%22hi%22%7D')
data = JSON.parse(Net::HTTP.get(uri))
puts data['valid'], data['problems']

Try It

Live request

Edit the path and send it. This runs against the real endpoint.

Press Send to run the request.

Rate Limits

10 requests per second per IP, across every endpoint.

Going over returns 429 — back off and retry.

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