The Node.js OCR SDK supports the Bank Check API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.

Quick-Start

const mindee = require("mindee");
// for TS or modules:
// import * as mindee from "mindee";

// Init a new client
const mindeeClient = new mindee.Client({ apiKey: "my-api-key" });

// Load a file from disk
const inputSource = mindeeClient.docFromPath("/path/to/the/file.ext");

// Parse the file
const apiResponse = mindeeClient.parse(
  mindee.product.us.BankCheckV1,
  inputSource
);

// Handle the response Promise
apiResponse.then((resp) => {
  // print a string summary
  console.log(resp.document.toString());
});

Output (RST):

########
Document
########
:Mindee ID: b9809586-57ae-4f84-a35d-a85b2be1f2a2
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/bank_check v1.0
:Rotation applied: Yes

Prediction
==========
:Check Issue Date: 2022-03-29
:Amount: 15332.90
:Payees: JOHN DOE
         JANE DOE
:Routing Number:
:Account Number: 7789778136
:Check Number: 0003401

Page Predictions
================

Page 0
------
:Check Position: Polygon with 21 points.
:Signature Positions: Polygon with 6 points.
:Check Issue Date: 2022-03-29
:Amount: 15332.90
:Payees: JOHN DOE
         JANE DOE
:Routing Number:
:Account Number: 7789778136
:Check Number: 0003401

Field Types

Standard Fields

These fields are generic and used in several products.

Basic Field

Each prediction object contains a set of fields that inherit from the generic Field class.
A typical Field object will have the following attributes:

• value (number | string): corresponds to the field value. Can be undefined if no value was extracted.
• confidence (number): the confidence score of the field prediction.
• boundingBox ([Point, Point, Point, Point]): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
• polygon (Point[]): contains the relative vertices coordinates (Point) of a polygon containing the field in the image.
• pageId (number): the ID of the page, always undefined when at document-level.
• reconstructed (boolean): indicates whether an object was reconstructed (not extracted as the API gave it).

Note: A Point simply refers to an array of two numbers ([number, number]).

Aside from the previous attributes, all basic fields have access to a toString() method that can be used to print their value as a string.

Amount Field

The amount field AmountField only has one constraint: its value is a number (or undefined).

Date Field

Aside from the basic Field attributes, the date field DateField also implements the following:

• dateObject (Date): an accessible representation of the value as a JavaScript object.

Position Field

The position field PositionField does not implement all the basic Field attributes, only boundingBox, polygon and pageId. On top of these, it has access to:

• rectangle ([Point, Point, Point, Point]): a Polygon with four points that may be oriented (even beyond canvas).
• quadrangle ([Point, Point, Point, Point]): a free polygon made up of four points.

String Field

The text field StringField only has one constraint: its value is a string (or undefined).

Page-Level Fields

Some fields are constrained to the page level, and so will not be retrievable at document level.

Attributes

The following fields are extracted for Bank Check V1:

Account Number

accountNumber (StringField): The check payer's account number.

console.log(result.document.inference.prediction.accountNumber.value);

Amount

amount (AmountField): The amount of the check.

console.log(result.document.inference.prediction.amount.value);

Check Number

checkNumber (StringField): The issuer's check number.

console.log(result.document.inference.prediction.checkNumber.value);

Check Position

📄checkPosition (PositionField): The position of the check on the document.

for (const checkPositionElem of result.document.checkPosition) {
  console.log(checkPositionElem.polygon);
}

Check Issue Date

date (DateField): The date the check was issued.

console.log(result.document.inference.prediction.date.value);

Payees

payees (StringField[]): List of the check's payees (recipients).

for (const payeesElem of result.document.inference.prediction.payees) {
  console.log(payeesElem.value);
}

Routing Number

routingNumber (StringField): The check issuer's routing number.

console.log(result.document.inference.prediction.routingNumber.value);

Signature Positions

📄signaturesPositions (PositionField[]): List of signature positions

for (const page of result.document.inference.pages) {
  for (const signaturesPositionsElem of page.prediction.signaturesPositions) {
    console.log(signaturesPositionsElem.polygon);
    console.log(signaturesPositionsElem.quadrangle);
    console.log(signaturesPositionsElem.rectangle);
    console.log(signaturesPositionsElem.boundingBox);
  }
}

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