Fake data, UUIDs and mock values for testing
Generate realistic fake test data, UUIDs, mock JSON and cron expressions for development and QA work.
Fake Test Data Generator
Generate realistic fake names, addresses, and phone numbers for testing.
Random for DevelopersMock JSON Data Generator
Generate an array of mock JSON objects with random field values.
Random for DevelopersRandom Cron Expression Generator
Generate a random valid cron expression with a plain-English explanation.
Random for DevelopersRaw Random Bytes Generator
Generate raw cryptographically secure random bytes, visualized as a color mosaic.
Random for DevelopersRandom IP & MAC Address Generator
Generate random IPv4, IPv6, or MAC addresses for test data.
Random for DevelopersRandom User-Agent String Generator
Generate a random realistic browser User-Agent string for testing.
Random for DevelopersTest Payment Card Picker
Pick an official Stripe sandbox test card number for a specific test scenario.
Random for DevelopersRandom Timezone Picker
Pick a random world timezone and see the current time there live.
Random for DevelopersFake US Phone Number Generator
Generate realistic-looking but guaranteed non-working US phone numbers for testing.
Random for DevelopersFake US Address Generator
Generate a realistic fake US mailing address — street, city, state, ZIP, county, and map location.
Random for DevelopersUS Full Name Generator
Generate realistic full US names — first, middle, last, with optional titles and suffixes.
Random for DevelopersFake Test Identity Generator
Generate a complete fake test persona — name, DOB, address, phone, email, job, and more — for filling out test forms in one click.
Random for DevelopersRandom PIN Code Generator
Generate a secure random numeric PIN, with an option to avoid weak patterns.
Random for DevelopersBackup / Recovery Code Generator
Generate a set of two-factor authentication style backup/recovery codes for testing.
Random for DevelopersBusiness Reference Number Generator
Generate realistic invoice, PO, SKU, tracking, ticket, and other business reference numbers.
Random for DevelopersULID / Nano ID Generator
Generate spec-compliant ULIDs and Nano IDs — modern alternatives to UUID.
Random for DevelopersRandom HTTP Status Code Generator
Generate a random real HTTP status code with its meaning, filterable by category.
Random for DevelopersFake Company Generator
Generate a fake company profile — name, industry, address, size, and website domain.
Random for DevelopersFake data, UUIDs and mock values for testing
A toolkit for the randomness developers actually need day to day: UUIDs, raw cryptographically secure random bytes, mock JSON fixtures, fake test records, IP and MAC addresses, User-Agent strings, and safe sandbox-only test payment card numbers pulled directly from Stripe's own published test documentation — never algorithmically generated, for reasons covered on that tool's page.
For anything touching real security — API keys, salts, tokens, session identifiers — randomness quality isn't optional. The password and entropy guide covers the same principles that apply to the Raw Random Bytes Generator: length and true unpredictability matter far more than superficial complexity rules.
Every tool here runs client-side with no server round-trip, which also means none of your test data, however sensitive-looking, ever leaves your browser.