Randommer API

Test Data / API Key Intermediate HTTPS CORS
Varies by plan (check documentation)

Overview

Randommer is a multi-purpose random data API that generates names, phone numbers, credit card numbers, text, and more — all through a single key-authenticated endpoint. It is a great one-stop shop for filling test forms with believable fake data. Register for a free API key to get started.

💡

Beginner Tip

Pass your API key in the X-Api-Key request header rather than as a query parameter — this is the most common source of 401 errors for new users.

Available Data

randomly generated data
customizable output format
Use case: Integrate random data generator data into web and mobile applications

Example Response

JSON Response
{
  "status": "success",
  "data": {
    "result": "Data from Randommer",
    "description": "Random data generator",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

(array of strings) Most endpoints return a JSON array of generated strings, e.g. ["John Smith", "Jane Doe"]

Implementation Example

const url = "https://randommer.io/randommer-api";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

401 Unauthorized API key sent as query param instead of header
Send the key as the X-Api-Key HTTP header: -H "X-Api-Key: YOUR_API_KEY"
Unknown endpoint 404 Using a wrong path for the resource type
Check the Randommer API docs at randommer.io/randommer-api for the exact path per data type
Quota exceeded Free tier has a monthly request limit
Monitor your usage in the Randommer dashboard and upgrade if needed

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 5/20
🔒 Security 15/15
🛠 Developer XP 17/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS YES
Category Test Data
Difficulty Intermediate
Verified: 2026-04-04

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