ULID GeneratorULID Generator API

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ULID Generator is a tool for generating Universally Unique Lexicographically Sortable Identifiers (ULIDs). ULIDs are 26-character strings that are sortable by time and collision-resistant.

The ULID Generator API provides reliable and fast access to ulid generator data through a simple REST interface. Built for developers who need consistent, high-quality results with minimal setup time.

To use ULID Generator, you need an API key. You can get one by creating a free account and visiting your dashboard.

GET Endpoint

URL
https://api.apiverve.com/v1/ulidgenerator

Code Examples

Here are examples of how to call the ULID Generator API in different programming languages:

cURL Request
curl -X GET \
  "https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000" \
  -H "X-API-Key: your_api_key_here"
JavaScript (Fetch API)
const response = await fetch('https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000', {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
});

const data = await response.json();
console.log(data);
Python (Requests)
import requests

headers = {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
}

response = requests.get('https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000', headers=headers)

data = response.json()
print(data)
Node.js (Native HTTPS)
const https = require('https');
const url = require('url');

const options = {
  method: 'GET',
  headers: {
    'X-API-Key': 'your_api_key_here',
    'Content-Type': 'application/json'
  }
};

const req = https.request('https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000', options, (res) => {
  let data = '';
  res.on('data', (chunk) => data += chunk);
  res.on('end', () => console.log(JSON.parse(data)));
});

req.end();
PHP (cURL)
<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, 'https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'X-API-Key: your_api_key_here',
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);
print_r($data);

?>
Go (net/http)
package main

import (
    "fmt"
    "io"
    "net/http"

)

func main() {
    req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000", nil)

    req.Header.Set("X-API-Key", "your_api_key_here")
    req.Header.Set("Content-Type", "application/json")

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, _ := io.ReadAll(resp.Body)
    fmt.Println(string(body))
}
Ruby (Net::HTTP)
require 'net/http'
require 'json'

uri = URI('https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
request['X-API-Key'] = 'your_api_key_here'
request['Content-Type'] = 'application/json'

response = http.request(request)
puts JSON.pretty_generate(JSON.parse(response.body))
C# (HttpClient)
using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        using var client = new HttpClient();
        client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key_here");

        var response = await client.GetAsync("https://api.apiverve.com/v1/ulidgenerator?count=5&timestamp=1609459200000");
        response.EnsureSuccessStatusCode();

        var responseBody = await response.Content.ReadAsStringAsync();
        Console.WriteLine(responseBody);
    }
}

Authentication

The ULID Generator API requires authentication via API key. Include your API key in the request header:

Required Header
X-API-Key: your_api_key_here

Learn more about authentication →

Interactive API Playground

Test the ULID Generator API directly in your browser with live requests and responses.

Parameters

The following parameters are available for the ULID Generator API:

Generate ULID

ParameterTypeRequiredDescriptionDefaultExample
countintegeroptional
Number of ULIDs to generate
Range: 1 - 100
15
timestampintegeroptional
Custom timestamp in milliseconds (optional, uses current time if not specified)
-1609459200000

Response

The ULID Generator API returns responses in JSON, XML, YAML, and CSV formats:

Example Responses

JSON Response
200 OK
{
  "status": "ok",
  "error": null,
  "data": {
    "ulids": [
      "01KCMMK564DMMCC17AVBZTVNT1",
      "01KCMMK565ZE4681DFAEWBF95G",
      "01KCMMK566K1REYH0JEK4Q8DKW",
      "01KCMMK5670W9EHFNX76R8FKWH",
      "01KCMMK568SFRY6DCZTZYMR66Y"
    ],
    "count": 5,
    "timestamp": 1765924246724,
    "format": "26 characters (10 timestamp + 16 random)",
    "sortable": true,
    "case_insensitive": true
  }
}
XML Response
200 OK
<?xml version="1.0" encoding="UTF-8"?>
<response>
  <status>ok</status>
  <error xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
  <data>
    <ulids>
      <ulid>01KCMMK564DMMCC17AVBZTVNT1</ulid>
      <ulid>01KCMMK565ZE4681DFAEWBF95G</ulid>
      <ulid>01KCMMK566K1REYH0JEK4Q8DKW</ulid>
      <ulid>01KCMMK5670W9EHFNX76R8FKWH</ulid>
      <ulid>01KCMMK568SFRY6DCZTZYMR66Y</ulid>
    </ulids>
    <count>5</count>
    <timestamp>1765924246724</timestamp>
    <format>26 characters (10 timestamp + 16 random)</format>
    <sortable>true</sortable>
    <case_insensitive>true</case_insensitive>
  </data>
</response>
YAML Response
200 OK
status: ok
error: null
data:
  ulids:
    - 01KCMMK564DMMCC17AVBZTVNT1
    - 01KCMMK565ZE4681DFAEWBF95G
    - 01KCMMK566K1REYH0JEK4Q8DKW
    - 01KCMMK5670W9EHFNX76R8FKWH
    - 01KCMMK568SFRY6DCZTZYMR66Y
  count: 5
  timestamp: 1765924246724
  format: 26 characters (10 timestamp + 16 random)
  sortable: true
  case_insensitive: true
CSV Response
200 OK
keyvalue
ulids[01KCMMK564DMMCC17AVBZTVNT1,01KCMMK565ZE4681DFAEWBF95G,01KCMMK566K1REYH0JEK4Q8DKW,01KCMMK5670W9EHFNX76R8FKWH,01KCMMK568SFRY6DCZTZYMR66Y]
count5
timestamp1765924246724
format26 characters (10 timestamp + 16 random)
sortabletrue
case_insensitivetrue

Response Structure

All API responses follow a consistent structure with the following fields:

FieldTypeDescriptionExample
statusstringIndicates whether the request was successful ("ok") or failed ("error")ok
errorstring | nullContains error message if status is "error", otherwise nullnull
dataobject | nullContains the API response data if successful, otherwise null{...}

Learn more about response formats →

Response Data Fields

When the request is successful, the data object contains the following fields:

Response fields marked with Premium are available exclusively on paid plans.View pricing
FieldTypeSample ValueDescription
ulidsarray["01KCMMK564DMMCC17AVBZTVNT1", ...]Array of generated ULID strings in proper format
countnumber5Number of ULIDs generated in this request
timestampPremiumnumber1765924246724Timestamp in milliseconds used for generation
formatstring"26 characters (10 timestamp + 16 random)"ULID format specification and component breakdown details
sortablebooleantrueWhether generated ULIDs maintain natural chronological sorting
case_insensitivebooleantrueWhether ULIDs are case-insensitive for comparison purposes

Headers

Required and optional headers for ULID Generator API requests:

Header NameRequiredExample ValueDescription
X-API-Keyrequiredyour_api_key_hereYour APIVerve API key. Found in your dashboard under API Keys.
Acceptoptionalapplication/jsonSpecify response format: application/json (default), application/xml, or application/yaml
User-AgentoptionalMyApp/1.0Identifies your application for analytics and debugging purposes
X-Request-IDoptionalreq_123456789Custom request identifier for tracking and debugging requests
Cache-Controloptionalno-cacheControl caching behavior for the request and response

Learn more about request headers →

GraphQL AccessALPHA

Access ULID Generator through GraphQL to combine it with other API calls in a single request. Query only the ulid generator data you need with precise field selection, and orchestrate complex data fetching workflows.

Test ULID Generator in the GraphQL Explorer to confirm availability and experiment with queries.

Credit Cost: Each API called in your GraphQL query consumes its standard credit cost.

GraphQL Endpoint
POST https://api.apiverve.com/v1/graphql
GraphQL Query Example
query {
  ulidgenerator(
    input: {
      count: 5
      timestamp: 1609459200000
    }
  ) {
    ulids
    count
    timestamp
    format
    sortable
    case_insensitive
  }
}

Note: Authentication is handled via the x-api-key header in your GraphQL request, not as a query parameter.

CORS Support

The ULID Generator API supports Cross-Origin Resource Sharing (CORS) with wildcard configuration, allowing you to call ULID Generator directly from browser-based applications without proxy servers.

CORS HeaderValueDescription
Access-Control-Allow-Origin*Accepts requests from any origin
Access-Control-Allow-Methods*Accepts any HTTP method
Access-Control-Allow-Headers*Accepts any request headers

Browser Usage: You can call ULID Generator directly from JavaScript running in the browser without encountering CORS errors. No proxy server or additional configuration needed.

Learn more about CORS support →

Rate Limiting

ULID Generator API requests are subject to rate limiting based on your subscription plan. These limits ensure fair usage and maintain service quality for all ULID Generator users.

PlanRate LimitDescription
Free5 requests/minHard rate limit enforced - exceeding will return 429 errors
StarterNo LimitProduction ready - standard traffic priority
ProNo LimitProduction ready - preferred traffic priority
MegaNo LimitProduction ready - highest traffic priority

Learn more about rate limiting →

Rate Limit Headers

When rate limits apply, each ULID Generator response includes headers to help you track your usage:

HeaderDescription
X-RateLimit-LimitMaximum number of requests allowed per time window
X-RateLimit-RemainingNumber of requests remaining in the current window
X-RateLimit-ResetUnix timestamp when the rate limit window resets

Handling Rate Limits

Free Plan: When you exceed your rate limit, ULID Generator returns a 429 Too Many Requests status code. Your application should implement appropriate backoff logic to handle this gracefully.

Paid Plans: No rate limiting or throttling applied. All paid plans (Starter, Pro, Mega) are production-ready.

Best Practices for ULID Generator:

  • Monitor the rate limit headers to track your ULID Generator usage (Free plan only)
  • Cache ulid generator responses where appropriate to reduce API calls
  • Upgrade to Pro or Mega for guaranteed no-throttle ULID Generator performance

Note: ULID Generator rate limits are separate from credit consumption. You may have credits remaining but still hit rate limits when using ULID Generator on Free tier.

Error Codes

The ULID Generator API uses standard HTTP status codes to indicate success or failure:

CodeMessageDescriptionSolution
200OKRequest successful, data returnedNo action needed - request was successful
400Bad RequestInvalid request parameters or malformed requestCheck required parameters and ensure values match expected formats
401UnauthorizedMissing or invalid API keyInclude x-api-key header with valid API key from dashboard
403ForbiddenAPI key lacks permission or insufficient creditsCheck credit balance in dashboard or upgrade plan
429Too Many RequestsRate limit exceeded (Free: 5 req/min)Implement request throttling or upgrade to paid plan
500Internal Server ErrorServer error occurredRetry request after a few seconds, contact support if persists
503Service UnavailableAPI temporarily unavailableWait and retry, check status page for maintenance updates

Learn more about error handling →

Need help? Contact support with your X-Request-ID for assistance.

Integrate ULID Generator with SDKs

Get started quickly with official ULID Generator SDKs for your preferred language. Each library handles authentication, request formatting, and error handling automatically.

Available for Node.js, Python, C#/.NET, and Android/Java. All SDKs are open source and regularly updated.

Integrate ULID Generator with No-Code API Tools

Connect the ULID Generator API to your favorite automation platform without writing code. Build workflows that leverage ulid generator data across thousands of apps.

All platforms use your same API key to access ULID Generator. Visit our integrations hub for step-by-step setup guides.

Frequently Asked Questions

How do I get an API key for ULID Generator?
Sign up for a free account at dashboard.apiverve.com. Your API key will be automatically generated and available in your dashboard. The same key works for ULID Generator and all other APIVerve APIs. The free plan includes 1,000 credits plus a 500 credit bonus.
How many credits does ULID Generator cost?

Each successful ULID Generator API call consumes credits based on plan tier. Check the pricing section above for the exact credit cost. Failed requests and errors don't consume credits, so you only pay for successful ulid generator lookups.

Can I use ULID Generator in production?

The free plan is for testing and development only. For production use of ULID Generator, upgrade to a paid plan (Starter, Pro, or Mega) which includes commercial use rights, no attribution requirements, and guaranteed uptime SLAs. All paid plans are production-ready.

Can I use ULID Generator from a browser?
Yes! The ULID Generator API supports CORS with wildcard configuration, so you can call it directly from browser-based JavaScript without needing a proxy server. See the CORS section above for details.
What happens if I exceed my ULID Generator credit limit?

When you reach your monthly credit limit, ULID Generator API requests will return an error until you upgrade your plan or wait for the next billing cycle. You'll receive notifications at 80% and 95% usage to give you time to upgrade if needed.

What's Next?

Continue your journey with these recommended resources

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