Skip to content

Fake / Test Data Generator

Build a schema and generate realistic mock data in bulk — export JSON, NDJSON, CSV or SQL. Seeded for reproducible fixtures, 100% private.

Schema fields
Quick presets
Schema changed — regenerate
rows fields
Preview
#
Output 

    


    

        🔒 100% private & offline — every value is synthesised in your browser from built-in lists; nothing is uploaded. The same seed + schema always reproduces the exact same data set. Generated content is fictional; credit-card numbers use known test ranges and are not real.
    




    

    

        
        
        
    

    





    

        
Why you’ll love Fake / Test Data Generator

        

                            

                    
                    Instant & freeNo signup, no paywall, no limits — Fake / Test Data Generator works the moment the page loads.
                

                            

                    
                    Completely privateEverything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
                

                            

                    
                    Works on any deviceFully responsive and touch-friendly — use it on your phone, tablet or desktop.
                

                            

                    
                    Built by developersAccurate, fast and keyboard-friendly — the details developers care about.
                

                    

        
How to use it

        
    
                            
  1. 01
    Open it
    No download and no login — the tool is ready right at the top of this page.
    2. 
                            
  2. 02
    Use it
    Enter your details or start interacting. Everything updates live as you go.
    3. 
                            
  3. 03
    Get your result
    Copy, download or share your result in a single tap. That’s it.
    4. 
                    

    






    

                    
About Fake / Test Data Generator

            
Generate realistic test data instantly with this free fake data generator. Build custom schemas and produce mock data in bulk — perfect for populating databases, testing APIs, or running load tests without risk. Export your dummy data as JSON, NDJSON, CSV, or SQL directly. Everything runs in your browser with no signup required, and your data never leaves your device, ensuring complete privacy for your test datasets.
This mock data generator uses seeded generation to create completely reproducible test datasets, letting you regenerate identical fixtures whenever you need them for consistent testing. Define your schema once, set a seed value, and get identical sample data across multiple runs. Ideal for developers testing new features, QA teams validating systems, database administrators preparing test environments, or anyone building reliable dummy data for integration tests.
Built for developers who need quality sample data fast. No installation, no accounts, no complicated workflows — just define your data structure and generate as much dummy data as you need in seconds. Export in whatever format your project requires: JSON for APIs, CSV for spreadsheets, SQL for databases, or NDJSON for streaming pipelines. Perfect for filling test environments without manual data entry.

                            
Popular uses

            
  • ✦ Test REST APIs with realistic mock data without touching production systems
  • ✦ Seed development databases with dummy data that matches your actual schema
  • ✦ Run load tests and performance testing with large volumes of sample data
  • ✦ Generate test fixtures for unit and integration tests with consistent seeded data
  • ✦ Populate staging environments with CSV or JSON test data before QA cycles

            






    

        
Frequently asked questions

        
Does my data stay private?
Yes. This test data generator runs entirely in your browser — all processing happens on your device, and nothing is sent to any server. Your generated mock data never leaves your computer.
Can I regenerate the same test data?
Yes. The seeded generation feature ensures reproducible results. Set a seed value when defining your schema, and you'll get identical sample data every time you generate it. Perfect for consistent test fixtures.
What formats can I export my dummy data to?
You can export as JSON (single file), NDJSON (newline-delimited for streaming), CSV (for spreadsheets), or SQL (INSERT statements for direct database loading).
Do I need to install anything or sign up?
No. This fake data generator is completely free and runs in your web browser. No installation, no account creation, no login required.
Is Fake / Test Data Generator free to use?
Fake / Test Data Generator is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Is my code or data sent anywhere?
Never. Everything is processed locally in your browser — safe for secrets, tokens and proprietary code.

    






    

                    

                
More developer tools

                All developer tools
            

            

                                    WCAG Contrast CheckerCheck colour contrast for accessibility — AA/AAA pass-fail with live preview.
                                    Cron Expression BuilderBuild and decode cron schedules in plain English, with the next run times.
                                    JSON ⇄ YAML ⇄ CSV ConverterConvert between JSON, YAML and CSV instantly, with validation and pretty-print.
                            

                            
People also use

            

                                    Free Resume Builder — No Signup, Print to PDFFree resume builder with live preview — make an ATS-friendly resume and save it...
                                    Income Tax Calculator (Canada)Estimate your federal + provincial income tax and take-home pay in Canada.
                                    Image Resizer & CompressorResize, convert and compress images to a target size (e.g. under 100 KB) — JPG/P...
                            

                
Browse all 317 free tools

    






    

        
We built this. We can build yours.

        
Fake / Test Data Generator is one of our free tools. Need a website, app, AI agent or automation? Fixed price — and you own the code.

        
Start a projectOur services