China National ID - Didit Documentation

curl -X POST "https://verification.didit.me/v3/database-validation/" \
  -H "x-api-key: YOUR_API_KEY" \
  -F "issuing_state=CHN" \
  -F "services=chn_national_id" \
  -F "vendor_data=user-1234" \
  -F "consent=true" \
  -F "full_name=王新伟" \
  -F "date_of_birth=1990-01-01" \
  -F "national_id=11010519900101003X"

{
  "request_id": "req_01H…",
  "status": "Approved",
  "issuing_state": "CHN",
  "match_type": "full_match",
  "validations": [
    {
      "outcome_code": "MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": true,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "full_match",
        "identification_number": "full_match"
      }
    }
  ]
}

{
  "request_id": "req_01H…",
  "status": "In Review",
  "issuing_state": "CHN",
  "match_type": "partial_match",
  "validations": [
    {
      "outcome_code": "PARTIAL_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": false,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "no_match",
        "identification_number": "full_match"
      }
    }
  ]
}

{
  "request_id": "req_01H…",
  "status": "Declined",
  "issuing_state": "CHN",
  "match_type": "no_match",
  "validations": [
    {
      "outcome_code": "NO_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "NO_MATCH",
        "full_name": "NO_MATCH",
        "identification_number": "NO_MATCH"
      },
      "validation": {
        "date_of_birth": "no_match",
        "full_name": "no_match",
        "identification_number": "no_match"
      }
    }
  ]
}

POST

database-validation

curl -X POST "https://verification.didit.me/v3/database-validation/" \
  -H "x-api-key: YOUR_API_KEY" \
  -F "issuing_state=CHN" \
  -F "services=chn_national_id" \
  -F "vendor_data=user-1234" \
  -F "consent=true" \
  -F "full_name=王新伟" \
  -F "date_of_birth=1990-01-01" \
  -F "national_id=11010519900101003X"

{
  "request_id": "req_01H…",
  "status": "Approved",
  "issuing_state": "CHN",
  "match_type": "full_match",
  "validations": [
    {
      "outcome_code": "MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": true,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "full_match",
        "identification_number": "full_match"
      }
    }
  ]
}

{
  "request_id": "req_01H…",
  "status": "In Review",
  "issuing_state": "CHN",
  "match_type": "partial_match",
  "validations": [
    {
      "outcome_code": "PARTIAL_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": false,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "no_match",
        "identification_number": "full_match"
      }
    }
  ]
}

{
  "request_id": "req_01H…",
  "status": "Declined",
  "issuing_state": "CHN",
  "match_type": "no_match",
  "validations": [
    {
      "outcome_code": "NO_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "NO_MATCH",
        "full_name": "NO_MATCH",
        "identification_number": "NO_MATCH"
      },
      "validation": {
        "date_of_birth": "no_match",
        "full_name": "no_match",
        "identification_number": "no_match"
      }
    }
  ]
}

Verifies input data against the official data service in China. Didit exposes this service through POST /v3/database-validation/ so you can verify the submitted data against the authoritative source and receive normalized match results.

Coverage

Coverage: ~ 100%
Country: China
Service ID: chn_national_id
Data domain: Identity
Category: NationalIDRegistry

Inputs

Field	Required	Example
`full_name`	Yes	`王新伟`
`date_of_birth`	Yes	`1990-01-01`
`national_id`	Yes	`11010519900101003X`
`vendor_data`	No	`user-1234`

Required inputs: full_name, date_of_birth, national_id
Optional inputs: vendor_data
Consent: Required
Workflow availability: Available in workflow
Coverage: ~ 100%
Price: $0.30 per successful query

Not every document this service accepts carries the identifier it queries by. When the identifier is not extracted from the document the check is recorded as not applicable - no database is queried and you are not charged - which for some countries is a large share of real users. To cover them, also collect the identifier from a Questionnaire answer, a Document AI extraction field, or a value you send when you create the session, and map it on the Database Validation step.

Body parameters

string

default:"CHN"

required

ISO 3166-1 alpha-3 country code for this database service.Example: CHN

string

default:"chn_national_id"

required

Array containing this service ID. Pinning the service keeps the request scoped to this exact database.Example: chn_national_id

Explicit end-user consent for this service.Example: true

string

default:"王新伟"

required

Full legal name to validate.Example: 王新伟

string

default:"1990-01-01"

required

Date of birth in YYYY-MM-DD format.Example: 1990-01-01

string

default:"11010519900101003X"

required

National identity number for this service.Example: 11010519900101003X

string

default:"user-1234"

Your stable user reference for this person, such as your internal user ID. Didit uses it to link standalone checks to the same end user and reduce duplicate-detection noise.Example: user-1234

Input rules & validation notes

Date of birth must match the birth date encoded in the Chinese national ID (digits 7-14 of an 18-character number, 7-12 of a legacy 15-digit one)
date_of_birth must match the birth date encoded in national_id; the source rejects the request outright when the two disagree, so a mismatch is refused before the lookup and is not charged.
national_id must match (\d{15}|\d{17}[\dXx]).
The final Chinese Resident Identity Card check character is validated.
full_name must be the original Chinese-script name as it appears in the registry or on the document. Do not send the Latin transliteration for China database checks.

How to call it

curl -X POST "https://verification.didit.me/v3/database-validation/" \
  -H "x-api-key: YOUR_API_KEY" \
  -F "issuing_state=CHN" \
  -F "services=chn_national_id" \
  -F "vendor_data=user-1234" \
  -F "consent=true" \
  -F "full_name=王新伟" \
  -F "date_of_birth=1990-01-01" \
  -F "national_id=11010519900101003X"

Every successful call returns HTTP 200. The outcome_code field tells you what actually happened — distinguishing, for example, a real biometric mismatch (BIOMETRIC_NO_MATCH) from a selfie that could not be read (BIOMETRIC_IMAGE_UNUSABLE). The status shown is the default feature status; your configured Partial Match / No Match actions can override it.

MATCH — The registry confirmed the identity and every checked field matched.

{
  "request_id": "req_01H…",
  "status": "Approved",
  "issuing_state": "CHN",
  "match_type": "full_match",
  "validations": [
    {
      "outcome_code": "MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": true,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "full_match",
        "identification_number": "full_match"
      }
    }
  ]
}

PARTIAL_MATCH — The identification number was found but one or more personal fields (usually name or date of birth) did not fully match.

{
  "request_id": "req_01H…",
  "status": "In Review",
  "issuing_state": "CHN",
  "match_type": "partial_match",
  "validations": [
    {
      "outcome_code": "PARTIAL_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "1990-01-01",
        "identification_number": "11010519900101003X",
        "verifications": {
          "date_of_birth": true,
          "full_name": false,
          "identification_number": true
        }
      },
      "validation": {
        "date_of_birth": "full_match",
        "full_name": "no_match",
        "identification_number": "full_match"
      }
    }
  ]
}

NO_MATCH — The registry returned no match for the submitted data.

{
  "request_id": "req_01H…",
  "status": "Declined",
  "issuing_state": "CHN",
  "match_type": "no_match",
  "validations": [
    {
      "outcome_code": "NO_MATCH",
      "service_id": "chn_national_id",
      "service_name": "China National ID",
      "source_data": {
        "date_of_birth": "NO_MATCH",
        "full_name": "NO_MATCH",
        "identification_number": "NO_MATCH"
      },
      "validation": {
        "date_of_birth": "no_match",
        "full_name": "no_match",
        "identification_number": "no_match"
      }
    }
  ]
}

Returned data

The exact fields surfaced in source_data depend on what the registry returns. The generated example for chn_national_id currently documents this normalized shape:

date_of_birth
identification_number

Pricing & SLAs

China National ID queries are billed only when Didit receives a conclusive result from the validation source.

Per-call price: $0.30 USD.
Billing: per successful query. You are not charged when the registry is unreachable, when required fields are missing, or when the request is rejected before reaching the source.
Latency: typical p95 < 2 s.
Availability: 99.9% per quarter on Didit’s side; downstream source availability varies by country and dataset.

​Coverage

​Inputs

​Body parameters

​Input rules & validation notes

​How to call it

​Returned data

​Pricing & SLAs

​Continue reading

Coverage

Inputs

Body parameters

Input rules & validation notes

How to call it

Returned data

Pricing & SLAs

Continue reading