Dev Tools
Seven tools for the moments a developer reaches for a browser tab: a JSON formatter that validates, repairs and keeps big numbers exactly; a JWT decoder that explains every claim and says why a signature fails; a URL encoder and decoder that also takes a link apart and strips its tracking; a regex tester that highlights every match and explains the pattern in plain English; a cron expression parser that says in plain English when a schedule runs, lists its next runs in any time zone and says what a clock change does to them; a hash generator for MD5, the SHA families, BLAKE3, CRC-32 and HMAC; and a Unix timestamp converter that reads seconds, milliseconds, Excel dates and Discord IDs alike. Everything runs on your machine, so a token or a customer’s file pasted in never leaves it.
In this folder
- JSON Formatter: Format, validate, repair and explore JSON: tree view, sorted keys, and big numbers kept exactly.
- Regex Tester: Test JavaScript regular expressions live: highlighted matches, capture groups, replace, and a plain-English explanation.
- Hash Generator: Hash text or files with MD5, SHA-1, SHA-2, SHA-3, BLAKE3, CRC-32 and more; verify a checksum; compute an HMAC.For one job: SHA-256 Hash Generator, MD5 Hash Generator
- Unix Timestamp Converter: Turn Unix timestamps in seconds, milliseconds or nanoseconds into dates and back, many at once, with Excel, Windows and Discord times too.
- JWT Decoder: Decode a JSON Web Token, read every claim and its dates, and verify the signature with a secret, a PEM or a key set, told why when it fails.
- URL Encode & Decode: Percent-encode or decode text for a URL with the kinds of escaping told apart, and take a link apart: edit its query, strip its tracking, see its real host.
- Cron Expression Parser: Read a cron expression in plain English, see its next runs in any time zone and what a clock change does to them, or build one; Unix, Spring, Quartz and EventBridge.
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