Fast, free developer tools that run in your browser.
No signup, no upload, no accounts. Every tool on jsonversal runs 100% on your device — your data never leaves your browser.
Tools
UUID v7 Generator & Timestamp Decoder
Generate RFC 9562 UUID v7 in bulk and decode the embedded timestamp.
JSON to TypeScript Interface
Coming soonGenerate type-safe TypeScript interfaces from JSON.
JSON to Zod Schema
Coming soonInfer a Zod validation schema from a JSON sample.
LLM Token & Pricing Calculator
Coming soonEstimate tokens and cost across GPT, Claude, Llama and Gemini.
Structured Output JSON Schema Generator
Coming soonCreate strict JSON Schema for LLM structured output.
More from the jsonversal brand matrix
DevOps Tools (devops.jsonversal.com)
YAML/JSON converter, Base64, crontab, JWT decoder, regex tester.
Code Generators (codegen.jsonversal.com)
.gitignore, license, README, CI workflow, commit message.
Security Tools (sec.jsonversal.com)
Hash, AES encryption, password strength, CSP generator, CSR decoder.