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
Generate type-safe TypeScript interfaces from JSON. (Coming soon)
JSON to Zod Schema
Infer a Zod validation schema from a JSON sample. (Coming soon)
LLM Token & Pricing Calculator
Estimate tokens and cost across GPT, Claude, Llama and Gemini. (Coming soon)
Structured Output JSON Schema Generator
Create strict JSON Schema for LLM structured output. (Coming soon)