Utils
A collection of small developer utilities. All processing happens client-side.
Extract MongoDB ObjectID Timestamp
Extract the creation timestamp from a MongoDB ObjectID. The first 4 bytes of an ObjectID encode the Unix timestamp when the document was created.
Timestamp Conversion
Convert between Unix timestamps and human-readable dates. Supports both seconds and milliseconds.
JSON Destringify
Recursively unwrap JSON strings embedded within JSON. Useful for logs or APIs that double-encode JSON data.
Cron Expression Explainer
Explain what a cron schedule expression means in plain English.
Color Converter
Convert colors between hex, RGB, and HSL formats with a visual preview.
Byte Size Converter
Convert between byte size units. Supports both SI (KB, MB, GB) and binary (KiB, MiB, GiB) units.
ASCII Table
Searchable ASCII character reference. Search by character, decimal, hex, or description.
| Dec | Hex | Binary | Char | Description |
|---|
Go Time Format Cheatsheet
Reference for Go's time.Format. Use parts of the reference time Mon Jan 2 15:04:05 MST 2006 as format placeholders.
2006-01-022006-01-02T15:04:05Z07:00Mon, 02 Jan 2006 15:04:05 MSTJanuary 2, 20062006年01月02日 15:043:04 PMJWT Decoder
Decode and inspect JSON Web Tokens. This tool only decodes the token — it does not validate the signature.