Open Source Developer Tools

Generate Dev Data
Instantly

Streaming synthetic data for developers. Lorem ipsum, datasets, dummy files, fake APIs, and more — all from a single API.

terminal
$ curl "https://api.devsim.dev/api/lorem?words=25"
{
  "text": "Lorem ipsum dolor sit amet, consectetur
  adipiscing elit, sed do eiusmod tempor incididunt
  ut labore et dolore magna aliqua. Ut enim ad minim
  veniam, quis nostrud exercitation..."
}

Everything you need, nothing you don't

Six categories of synthetic data, all streaming, all deterministic, all from a single HTTP call.

Lorem Ipsum

Generate words, sentences, or paragraphs on demand. Classic lorem or modern alternatives with deterministic seeds.

Datasets

Users, products, orders, and more in JSON, CSV, or NDJSON. Streaming output for any volume of records.

Dummy Files

Stream binary files from 1KB to 1GB instantly. Perfect for upload testing, bandwidth benchmarks, and CI pipelines.

Placeholder Images

SVG placeholder images in any dimension with customizable colors, text, and patterns. No external service needed.

Mock APIs

Fake REST endpoints that return realistic data with configurable latency, status codes, and pagination.

Logs & Events

Nginx access logs, system events, and SSE streams. Realistic timestamps, IPs, and user agents on the fly.

Quick Start

Three lines of curl. That's it.

LoremGET
$ curl "https://api.devsim.dev/api/lorem?words=50"
{
  "text": "Lorem ipsum dolor sit amet, consectetur
  adipiscing elit. Sed do eiusmod tempor incididunt
  ut labore et dolore magna aliqua. Ut enim ad minim
  veniam, quis nostrud exercitation ullamco laboris
  nisi ut aliquip ex ea commodo consequat..."
}
DatasetGET
$ curl "https://api.devsim.dev/api/dataset/users?rows=2"
[
  {
    "id": 1,
    "name": "Alice Chen",
    "email": "alice.chen@example.com",
    "role": "engineer"
  },
  {
    "id": 2,
    "name": "Bob Martinez",
    "email": "bob.martinez@example.com",
    "role": "designer"
  }
]
FileGET
$ curl -o test.bin "https://api.devsim.dev/api/dummy-file/10mb"
  % Total    % Received % Xferd  Speed
 100 10.0M  100 10.0M    0     0  45.2M      0 --:-- --:--

 Downloaded: test.bin (10,485,760 bytes)
Edge-powered
Streaming
Deterministic Seeds
Zero Storage

Ready to generate?

No signup, no API key, no rate limits. Just data.

Open Playground