postgres SELECT query returns unusable result - node.js

Question

I have a simple SELECT query that is returning an unusable result. I am using pg-promise in node.js
[
{
"function_name": "(f10d1988-4db5-49de-97ab-0c8b15bedfa7,image.jpg,Image)"
},
{
"function_name": "(f10d1988-4db5-49de-97ab-0c8b15bedfa7,image2.jpg,Image 2)"
}
]
but I was expecting a basic json structure like
[
{
id: '',
title: '',
image: ''
},
{...etc}
]
Why is it doing this? How do I get a normalized result?
My query looks like the below:
CREATE OR REPLACE FUNCTION get_photos(
title_param TEXT
)
RETURNS TABLE(
id UUID,
image varchar(200),
title varchar(200)
) AS
$func$
BEGIN
RETURN QUERY SELECT
i.id,
i.image,
i.title
FROM images AS i
WHERE i.title = title_param;
END;
$func$ LANGUAGE PLPGSQL;
Here is my db conenctor setup, almost all defaults.
require('dotenv').config();
const Promise = require('bluebird');
const pg = require('pg-promise')({
promiseLib: Promise
});
const config = {
user: process.env.USER,
host: process.env.HOST,
database: process.env.DATABASE,
password: process.env.PASSWORD
};
const db = pg(config);
export default db;
Here is the express endpoint that is calling the function:
export const getData = async (req, res) => {
const { title } = req.query;
let data;
try {
data = await db.many('SELECT function_name($1)', [title]);
} catch (err) {
data = err;
}
res.send(data);
};
EDIT
I ran the query manually instead of through a function and the data returned correctly which means that there is an issue with my TABLE() return. What could possibly cause this issue?
images = await db.many(`
SELECT
p.id,
p.img,
p.type,
p.title
FROM photos p
WHERE p.type = '${type}';
`, [type]);

Answer 1

Because the function is defined as returning a table, you need to use it like a table:
SELECT * FROM function_name($1)

Answer 2

Use func as the query method:
data = await db.func('function_name', [title]);
It assumes you return a table, and so will work for you by default.
And for stored procedures, there's proc method.
Also, your parameter formatting for the images query is wrong, see Named Parameters:
IMPORTANT: Never use the reserved ${} syntax inside ES6 template strings ...