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GoldieKit
A FOCUSED COLLECTION

Developer tools

Format data, inspect tokens, convert encodings, and test expressions without a processing API.

Start with a common task

JSON formatterJWT decoderRegex testerSHA hash generator

Find a tool

20 tools available

Developer tools
JSON formatter

Validate and indent JSON with clear syntax errors.

Developer tools
JSON minifier

Remove insignificant whitespace from valid JSON.

Developer tools
JSON to CSV

Convert an array of objects to correctly quoted CSV.

Developer tools
CSV to JSON

Parse quoted CSV rows and optional headers into JSON.

Developer tools
YAML to JSON

Parse YAML 1.2 and export JSON with alias limits.

Developer tools
JSON to YAML

Serialize valid JSON as readable YAML.

Developer tools
Base64 encoder and decoder

Convert UTF-8 text or local binary files to and from Base64.

Developer tools
URL encoder and decoder

Encode or decode a URL component or complete URL.

Developer tools
JWT decoder

Inspect a token header, payload, and timestamps without transmitting it.

Developer tools
UUID generator

Generate RFC 4122 version 4 UUIDs with secure browser randomness.

Developer tools
Password generator

Generate configurable passwords using secure browser randomness.

Developer tools
SHA hash generator

Hash text or local files with SHA-256, SHA-384, or SHA-512.

Developer tools
Unix timestamp converter

Convert Unix seconds, milliseconds, and ISO dates to local and UTC time.

Developer tools
Regex tester

Test bounded JavaScript expressions in a timed worker and inspect captures.

Developer tools
Color converter

Convert HEX, RGB, and HSL colors with a preview.

Developer tools
Color contrast checker

Calculate text contrast and WCAG AA/AAA thresholds.

Developer tools
URL parser

Inspect protocol, host, port, path, query, and fragment of HTTP URLs.

Developer tools
HTML entity converter

Encode or decode common HTML entities as safe text.

Developer tools
CSS unit converter

Convert px, rem, em, vw, vh, and percentages with explicit references.

Developer tools
Number base converter

Convert large integers between binary, octal, decimal, and hexadecimal.

Choose the right workflow

The JSON formatter reports syntax errors; the JWT decoder only reads claims and does not verify signatures. Avoid treating decoded values as trusted input.