Free Fake Data Generator for Developers.

Mask real data or generate fake data that keeps useful structure. Same seed, same output, every run. No AI, no model training, no credit card.

Mask DataGenerate DataAPI Docs
No AIDeterministic SeedsPII-Safe MaskingJSON CSV SQL YAML

Mask, Generate, Reproduce

Data Masking

Mask real CSV data while preserving structure for staging, demos, contractors, and QA.

Explore Module

Schema Builder

Build deterministic relational test data with 200+ generators and seeded exports.

Explore Module

API Documentation

REST endpoints for reproducible fixtures in CI, demos, and high-volume test pipelines.

Explore Module

01_PII_PROTECT

Structure-preserving masking replaces sensitive values while keeping files usable for staging, demos, and QA.

02_REPRO_FIXTURES

Same seed and same schema regenerate identical records, so fixtures can be committed, diffed, and trusted in CI.

03_CORE_GEN

Rule-based generators and Markov text models produce realistic test data without AI or external model calls.

generate_users.js
// Reproduce the same fixture every run
const response = await fetch('https://derpdata.com/api/generate/person?count=1000&seed=4242', {
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY'
  }
});

const dataset = await response.json();
console.log(`Generated ${dataset.length} rows.`);