Thedevtoolboxthatrunsinyourtab.

All five run on one parser that carries numbers through as raw text, so a 64-bit snowflake ID or a 19-digit order total comes out byte-identical instead of quietly rounded by JavaScript floats. The same engine repairs broken payloads and itemises what it changed, reports gzip size from the browser compression API rather than an estimate, and scans in-tab for tokens and personal data before you paste a snippet into a ticket.

These decode and then tell you what they found: the file type hiding behind a data URI, a payload peeled through several layers of encoding, a query string laid out as an editable table. The JWT tool goes further and verifies the signature — HMAC, RSA and ECDSA — inside your own tab, so you can prove a token is genuinely valid without handing a live credential to someone else’s server.

Paste a bare checksum with no label and verify mode works out the algorithm from its shape, then does the comparison for you. Files are streamed through Web Crypto in chunks, so a multi-gigabyte image hashes without being loaded into memory first. The identifier side does not only mint UUIDs, it reads them back — version, variant, and for v1 and v7 the timestamp buried inside.

Paste a value with no context and the format is detected for you across Unix seconds and milliseconds, ISO 8601, RFC 3339, Windows FILETIME, .NET ticks, Mongo ObjectIds and Excel serials. Both tools are timezone-aware instead of timezone-blind, so the cron preview lists real upcoming runs in the zone you choose and flags the daylight-saving transitions where a job silently runs twice or never runs at all.

The regex tester reads your pattern back to you in plain English, benchmarks it against adversarial input so catastrophic backtracking shows up as a measurement instead of a hunch, and emits the equivalent code for nine languages. The diff checker compares JSON by path rather than by line, so a reordered key stops being reported as a change, and it surfaces moved blocks and invisible characters that a line-based diff hides completely.

The SQL formatter does not stop at indentation — it reviews the query for the errors that cost money: a missing join condition that becomes a cartesian product, a DELETE with no WHERE, a NOT IN against a nullable column. The minifier re-parses its own output and compares the resulting DOM, so a saving is never a silent breakage. The colour converter scores contrast with both WCAG 2 and APCA and hands you the nearest passing colour instead of only reporting the failure.