ExtendsClass JSON Generator
Mockaroo
JSON Generator
MockTurtle.net
ThreadMine.dev
This free online tool allows to generate JSON dataset. You can generate multiple JSON files exported to a zip archive. No limits. No registration.
ThreadMine analyzes Java/JVM thread dumps in seconds. Upload or paste a dump (no signup, up to 10 MB) and get automatic detection of deadlocks, thread leaks, pool exhaustion, CPU hotspots and virtual thread pinning (Project Loom), plus a health score and a shareable report.
Parses HotSpot, OpenJ9, Zing and GraalVM. Paid plans add an AI assistant that explains the root cause and suggests a fix, multi-dump comparison/timeline, history, integrations and an API. A free, no-login web analyzer is the entry point โ the same low-friction flow as fastThread.io or jstack.review, but with automatic problem detection and AI on top.
Privacy: no account, TLS + AES-256, temporary dumps, zero AI-data retention.
ExtendsClass JSON Generator
ThreadMine.devNo features have been listed yet.
Mockaroo - A realistic data generator to test your app
JSON Generator - Create mock and sample JSON using a powerful template syntax
MockTurtle.net - Generate realistic random JSON data through a simple and intuitive GUI.