Function Call, Data, Errors

function_data_errors.js

//////// Function Call
        pgQuery(`SELECT update_table_func ($1)`,
            [chartProperties], function(err, results){
                if(err){
                    console.log("error .........>", err);
                    return callback (err);
                }
                callback(null, results.rows[0]);
            });

//////// Data Passed into the $1 Variable
'[{"chart_id":1,"chart_x":4,"chart_y":4,"chart_row":4,"chart_col":4},{"chart_id":2,"chart_x":3,"chart_y":3,"chart_row":3,"chart_col":3}]'

//////// Error returned from postgres in Node console
error .........> { [error: invalid input syntax for type json]
  name: 'error',
  length: 217,
  severity: 'ERROR',
  code: '22P02',
  detail: 'Expected ":", but found ",".',
  hint: undefined,
  position: undefined,
  internalPosition: undefined,
  internalQuery: undefined,
  where: 'JSON data, line 1: ..."chart_y\\":2,\\"chart_row\\":0,\\"chart_col\\":0}",...',
  schema: undefined,
  table: undefined,
  column: undefined,
  dataType: undefined,
  constraint: undefined,
  file: 'src\\backend\\utils\\adt\\json.c',
  line: '1140',
  routine: 'report_parse_error' }