Code Beautify JSON Validator
JSONLint
JSONFormatter.org
FreeFormatter
ExtendsClass JSON Formatter
JSON Formatter & Validator
Site24x7 JSON Formatter and Validator
betterjson.com
ThreadMine.dev
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.
Code Beautify JSON Validator
ThreadMine.devJSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
JSONFormatter.org - Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON
FreeFormatter - Freeformatter is a platform that contains free online tools for developers, including formatters (json, html, xml, sql, etc.), minifiers (css, javascript), compactors, validators, and much more.
ExtendsClass JSON Formatter - ExtendsClass JSON Formatter is a tool that allows you to beautify, minify, validate, view, and escape JSON code.
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
Site24x7 JSON Formatter and Validator - Site24x7 JSON Formatter and Validator is a tool that converts JSON input into a human-readable format, thereby enabling you to read it at a glance.