Check if a Douban username is taken

What we check on Douban

Standard tier - checked on every full lookup

Douban is checked from a username. The response says whether that handle exists on Douban - registered: true or registered: false - with the moment that was established in checkedAt. An email address on its own cannot reach Douban; if you only have an email, its local part is tried as a handle and any hit is labelled as derived, never counted as a confirmed match.

Douban is checked on every full lookup (?wait=true or streaming), alongside every other platform. It is not in the sub-second instant subset, which is reserved for the highest-value platforms for each input type.

If Douban blocks the check, times out, or answers ambiguously, it is omitted from results[] entirely rather than returned as registered: false. Absence from the response means "unconfirmed", never "no account".

Who checks Douban accounts

Identity providers, link-in-bio pages and everyday utilities are checked because almost everyone has an account on at least one of them. An email with no presence even here is unusual, which makes these platforms a useful baseline in any footprint.

More on this: Email fraud detection.

Inputs Douban accepts

• Username: send the handle as query. Douban is checked for that exact handle - useful when a person reuses the same name across platforms.

One request

curl -X POST "https://api.digifootprint.dev/v2/lookup?wait=true" \
  -H "Authorization: Bearer dfp_your_key" \
  -H "Content-Type: application/json" \
  -d '{"query": "someuser"}'

What a Douban result looks like

{
  "platform": "douban",
  "registered": true,
  "checkedAt": "2026-10-15T09:53:19.388Z",
  "identity": "username"
}

The full response shape - breaches, web mentions, matches versus socialMatches, and what method means - is in running a lookup.

Related platforms

Every one of these is checked in the same request as Douban.

More accounts & identity platforms: Npmpackage, About.me, Instructables, Ameblo, Huggingface, Pypi · all accounts & identity

Douban lookup FAQ

Can I check a phone number on Douban?

Not directly. Douban can be reached from username. Phone numbers are checked on the messaging and social apps that sign people up by phone.

How fast is a Douban check?

Douban is checked on a full lookup, which streams results as they land - the first matches arrive in around 60 milliseconds and the whole set typically completes in a few seconds.

What happens if Douban blocks the check?

Douban is left out of the response. We never report a platform we could not confirm as "not registered" - a missing platform means unconfirmed, not absent.

Does the API return the Douban account details?

No. You get whether an account exists for the input you sent, and when that was established. No profile contents, photos, followers or private data are collected or returned.