Developer Tools
JSON, Base64, URL, UUID, hashing, JWT, regex and other coding utilities.
JSON Formatter
Format and pretty-print JSON with validation and clear error messages.
Open tool →Developer ToolsJSON Minifier
Minify valid JSON into a compact one-line form.
Open tool →Developer ToolsJSON Validator
Check JSON syntax and report where parsing fails.
Open tool →Developer ToolsBase64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 back to text.
Open tool →Developer ToolsURL Encoder / Decoder
Encode or decode URL components safely in the browser.
Open tool →Developer ToolsUUID Generator
Generate RFC 4122-style version 4 UUIDs using the browser crypto API.
Open tool →Developer ToolsPassword Generator
Generate strong random passwords with adjustable length and character sets.
Open tool →Developer ToolsSHA-256 Hash Generator
Create a SHA-256 hash from text using the browser Web Crypto API.
Open tool →Developer ToolsUnix Timestamp Converter
Convert between Unix timestamps and local or UTC date-time values.
Open tool →Developer ToolsJWT Decoder
Decode JWT header and payload data locally without sending the token anywhere.
Open tool →Developer ToolsHTML Entity Encoder / Decoder
Encode special HTML characters or decode HTML entities back to text.
Open tool →Developer ToolsRegex Tester
Test a JavaScript regular expression against text and inspect matching results.
Open tool →Why this category exists
Costovia groups related utilities so visitors can move from one task to the next without starting another search. Every tool has a dedicated URL and links back to this hub.