Toolivaro

Developer text and JSON toolkit

A working day for a developer is full of small text chores: pretty-printing a JSON blob, shrinking an API response, converting rows between CSV and JSON, or comparing two config files. These tools do those jobs locally in your browser — nothing is uploaded, and the code is the same tested code that runs in this repository.

Popular tools

JSON Formatter & Validator Stable Format and validate JSON with readable indentation, precise error messages, and byte-size stats — fully local.
JSON Minifier Stable Compress JSON to its smallest valid form — strip all whitespace, count the bytes saved, and copy or download.
JSON to CSV Converter Stable Convert a JSON array of objects into RFC 4180 CSV with correct quoting, column union, and copy or download.
CSV to JSON Converter Stable Convert CSV files and pasted tables into JSON objects with automatic delimiter detection and header mapping.
Text Diff Checker Stable Compare two blocks of text line by line with added, removed, and unchanged highlighting plus change statistics — fully local.
Regex Tester Stable Test regular expressions live against your own text with match highlighting, capture groups, and flags — fully local.
AI Token Counter Stable Estimate tokens and API cost for any prompt across GPT-4o, Claude Sonnet 4, and other models — fully local.
Password, hashing, and security tools Generate strong passwords, hash text with SHA-2, decode JWTs, and encode data — security utilities that run entirely in your browser. Format and conversion tools Convert between data sizes, number bases, color formats, and image types — quick conversions for developers and designers.