Developer tools
Work with structured data without sending it away.
Open a focused tool, read its exact parser and whitespace rules, process supported input locally, and keep a visible result receipt.
Choose by format
Current browser-local developer tools
The collection starts with conservative XML formatting and grows only when a format has a clear, testable client-only contract.
Calculate an IPv4 CIDR network, mask, block range and carefully qualified /31 endpoints locally.
Open tool XML FormatterFormat or minify XML in your browser, with clear whitespace rules, local files and useful errors.
Open tool JWT DecoderDecode a compact JWT locally, inspect header and claims with UTC/local times, and see clearly that no signature verification ran.
Open toolBefore using an export
Check the format boundary, not just the file extension.
A source can be well formed without satisfying a schema, application profile, or downstream business rule. ToolNeko developer tools name the subset they handle and avoid broader conformance claims.
Common questions
Do ToolNeko developer tools upload my source?
No. Each listed tool states its boundary, processes supported input in the browser, and does not send the source to a ToolNeko task API.
Are formatting and validation the same task?
No. A formatter can change permitted layout while a validator checks a grammar. Read each tool's receipt and scope before using its result in a build or deployment.
Why do these tools have input limits?
Bounded size, depth, and token counts keep local processing responsive and make failures explicit instead of freezing the page or returning a partial result.