About
Last updated: 2026-06-25
DevTools is a free collection of online developer tools: JSON formatter, Base64, hash, JWT, UUID, regex, timestamp, color and base converters.
Every tool runs only in your browser (client side), and the data you enter is never sent to or stored on a server.
What is DevTools
DevTools (dev.moneycomon.com) is a free collection of tools that helps developers, students and IT professionals handle the conversion and validation tasks they meet every day. Small but repetitive jobs — formatting JSON, encoding, generating hashes, inspecting tokens, testing regex — can be done instantly in the browser, with no install or sign-up.
Our principles (E-E-A-T)
- Experience — the layout mirrors real development workflows so everything from input to copying the result happens on a single screen.
- Expertise — we follow standards: Web Crypto (SubtleCrypto) for hashing, RFC 4122 v4 for UUIDs, Base64URL decoding for JWTs, and standard parsers for JSON.
- Authoritativeness — we use only built-in browser APIs, with no external libraries or CDNs, so behavior is transparent and verifiable.
- Trustworthiness — all processing happens client side and we do not collect or store your input. We also state the limits clearly, such as the fact that the JWT decoder does not verify signatures.
Security — the client-side principle
Developer tools often handle sensitive data (tokens, internal JSON, identifiers). DevTools never sends this input to a server. JSON parsing and formatting, Base64 encoding, hash computation, JWT decoding, regex matching and every other operation run in your browser with JavaScript. Network requests are only for loading the page, styles and ads; nothing you enter is ever transmitted externally in any form.
That said, for highly security-sensitive work (production secret keys, verifying the signature of a real access token, etc.) we recommend re-checking in a trusted server environment.
Technical standards
- Web Crypto API (SubtleCrypto) — SHA hash computation
- crypto.randomUUID — RFC 4122 v4 UUID generation
- JSON (ECMAScript) — JSON parsing and serialization
- RFC 7519 (JWT) — decoding the JWT structure
A note on accuracy
DevTools results are reference aids for development. The tools follow standard algorithms, but there can be subtle differences from your production code and libraries, so cross-check important work. In particular, the JWT decoder does not verify signatures, and Base64 is not encryption.
Contact
Send suggestions or bug reports to contact@moneycomon.com. For details on how we handle data, see the Privacy Policy.
Last updated: 2026-06-25