Free Developer Tools
for Test Data Generation
Generate custom JSON test data, disposable emails, secure passwords and UUIDs instantly. Built for developers, QA engineers and API testers — no account needed.
Disposable Email Generator
Create a real disposable inbox instantly. Receive OTPs, verification links and HTML emails — powered by a real Postfix mail server.
JSON Test Data Generator
Build custom JSON payloads — select identity fields, add custom types like UUID, dates, decimals and more. Perfect for API testing and database seeding.
JSON Formatter & Validator
Format, beautify, validate and minify JSON instantly. Detect syntax errors, view JSON structure and improve readability for APIs, testing and debugging.
Base64 Encoder & Decoder
Encode, decode and validate Base64 data instantly. Perfect for API testing, authentication tokens, file conversion, data transmission and debugging tasks.
Password Generator
Generate strong, secure passwords instantly. Customizable length, special characters, numbers and uppercase options — with a live strength meter.
UUID Generator
Generate RFC 4122 compliant v4 UUIDs instantly. Ideal for database primary keys, API request identifiers and distributed systems.
What is a JSON Test Data Generator?
A JSON Test Data Generator creates structured, realistic and randomized test data instantly — without manually typing dummy records or risking real user data in your development environment. Select the fields you need, add custom types like UUIDs, dates and decimals, and get clean formatted JSON ready to paste into Postman, your test script or database seed file.
FakeTools provides a free collection of developer utilities — from JSON test data generation to disposable email inboxes — designed to simplify development, API testing and QA workflows instantly.
Use Cases
- API testing with realistic JSON payloads
- Database seeding and development setup
- Web and mobile app testing
- Authentication and security testing
- UI/UX prototyping with real-looking data
- QA automation pipelines
- Form validation and input testing
- Privacy protection with disposable email
Instant Generation
No waiting — generate test data and JSON payloads in milliseconds
Privacy Focused
No data stored or logged after your session ends
No Registration
Open the site and start using instantly — always
Real Mail Server
Disposable emails actually arrive — OTPs, links, HTML
Custom JSON Fields
Add your own fields — UUID, dates, decimals, strings
100% Free
No hidden charges, no premium walls, no limits