dockerhub.tag

stable Standard

Details of one Docker Hub image tag.

GET /v1/dockerhub/tag

What you get#

One Docker Hub record in Onekey's unified shape, in data. If the record does not exist you get a 404 not_found and are not charged.

What it costs#

Standard · 1 credit for a fresh fetch, charged only when it succeeds.
Free when served from cache (0.2 credit for a cached response over 100 KB).
Free if the request is invalid (never charged) or the source fails or reports not found (refunded).

Parameters#

Name	Type	Required	Default	What it is	Constraints
`namespace`	string	yes	(required)	Docker Hub namespace (use library for official images)	max 255 chars; must match `[a-z0-9][a-z0-9_-]{1,254}`; trimmed, lowercased
`repo`	string	yes	(required)	Docker Hub repository	max 255 chars; must match `[a-z0-9][a-z0-9_.-]{0,254}`; trimmed, lowercased
`tag`	string	yes	(required)	Image tag	max 128 chars; must match `[A-Za-z0-9_][A-Za-z0-9_.-]{0,127}`; trimmed

Request#

curl "https://api.onekey.dev/v1/dockerhub/tag?namespace=library&repo=nginx&tag=latest" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

A real Docker Hub response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "entity": {
      "name": "latest",
      "updatedAt": "2026-09-19T04:53:15Z",
      "status": "active"
    },
    "ext": {
      "size": 63400795,
      "digest": "sha256:abe47724e466aeab9a345d8e46a221c2fa8953c7848bb4a3bd9976a7199f8cf2"
    },
    "author": {
      "username": "doijanky"
    }
  },
  "metadata": {
    "platform": "dockerhub",
    "endpoint": "tag",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 1,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}

Field mapping#

How this endpoint's source fields become Onekey's unified schema. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`name`	`entity.name`	-
`last_updated`	`entity.updatedAt`	`toIsoDate`
`full_size`	`ext.size`	`toNumber`
`digest`	`ext.digest`	-
`tag_status`	`entity.status`	-
`last_updater_username`	`author.username`	-

Caching and freshness#

Fresh for about 1 hour. Repeat calls in that window are served from cache and are free.
Between 1 hour and 1 day the cached copy is still served instantly and marked stale: true while Onekey refreshes it in the background.
If the source is down when a refresh is needed, the last copy can be served for up to 3 days more (marked stale).
A "not found" is remembered for 5 minutes and is free.
The cache is shared across all customers, which is what keeps repeat calls cheap.

What can go wrong#

Status	Code	What to do
401	`unauthorized`	Check the `x-api-key` header.
402	`insufficient_credits`	Add credits; your balance must cover the price.
404	`not_found`	That record does not exist. Free; do not retry.
422	`invalid_params`	Fix the parameters using the table above. Free.
429	`rate_limited`	Wait `Retry-After` seconds, then retry.
502	`upstream_error`	The source failed. Refunded; retry with backoff.

See Errors for the full list and retry guidance.

Status: stable (verified against the live source).