JSON & LLM developer tools that run in your browser.
No signup, no upload, no accounts. Every tool on jsonversal runs 100% on your device — paste JSON, infer schemas, count LLM tokens, and estimate API costs without your data ever leaving your browser.
Tools
LLM Token & Pricing Calculator
Estimate tokens and cost across GPT, Claude, Llama and Gemini.
Structured Output JSON Schema Generator
Create strict JSON Schema for LLM structured output.
JSON to Zod Schema
Infer a Zod validation schema from a JSON sample.
JSON to TypeScript Interface
Generate type-safe TypeScript interfaces from JSON.
UUID v7 Generator & Timestamp Decoder
Generate RFC 9562 UUID v7 in bulk and decode the embedded timestamp.
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.