If we want to send data using Node.js, we can use the following script, from https://github.com/gerhardsletten/express-openalpr-server:

POST /plates with json:
{
        image: (base64 encoded data),
        country_code: 'eu',
        pattern_code: 'no'
}
returns 
{
        plate: 'DP49829',
        confidence: 79.758995,
        matches_template: 1,
        plate_index: 0,
        region: 'no',
        region_confidence: 0,
        processing_time_ms: 66.374001,
        requested_topn: 10,
        coordinates : {
                ...
        },
        candidates : [
                { plate: 'DP498Z9', confidence: 87.328056, matches_template: 0 },
                { plate: 'DP98Z9', confidence: 83.397873, matches_template: 0 },
                ...
        ]