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yutils
Example

Input (auto-detected)

eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.signature

Recommended tools

Detected: JWT · confidence 0.95
Suggested:
  1. JWT Decoder (best match)
  2. Base64 (for the encoded parts)

Note

Detects 24 formats: JSON, JWT, Base64, URL, UUID, ULID, Hex, Color, Timestamp, XML, HTML, CSS, JS, Cron, SQL, CSV, INI, TOML, YAML, EJSON, User-Agent, IP/CIDR, and more.

Usage / FAQ

When to use

  • Paste any text when you're unsure which tool to reach for
  • Quickly recognize unfamiliar tokens (e.g. from an Authorization header)
  • Inspect what type of data an API response contains
  • Tell apart CSV vs TSV and other near-identical formats
  • Plan a multi-tool workflow by previewing matches side by side

FAQ

Q.What if detection misclassifies?
A.Only matches with confidence ≥ 0.5 appear. If your intended tool is missing, search directly via the header (`Cmd+K`).
Q.Can multiple formats be detected at once?
A.Yes — e.g. a Base64 string that decodes to JSON shows both tools. Results are ranked by confidence.
Q.Is the text sent anywhere?
A.No — every detection runs locally in the browser.
Fun facts

  • Automatic content-type detection traces back to the Unix `file` command (Ian Darwin, 1986), which checks 'magic numbers' — distinctive file-header patterns. JSON's `{`, XML's `<?xml`, PNG's `89 50 4E 47` — they're all magic numbers.

    Wikipedia — file command

  • Apple's Universal Clipboard (2016, macOS Sierra) syncs the clipboard between devices on the same Apple ID over Bluetooth + Wi-Fi. It transmits not just the data but also its content type, enabling things like 'copy a color on iPhone, paste a hex code on Mac.'

    Apple — Universal Clipboard

  • Determining content type from text alone is a heuristic game — is `123` a number? string? date? JSON fragment? The first character isn't enough; you have to inspect the overall structure. yutils' smart-paste runs 20+ pattern checks in priority order (JSON → YAML → URL → …).

    Wikipedia — Content sniffing

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