邮递员x-www-form-urlencoded会为POST请求返回空值，即使输入字段已填写

Question

I used the postman's raw option and it worked, my input value returned as expected. But when I use the x-form-urlencoded option, "null" is returned. The get request all works well. Find below the screenshot of the postman cross-section:

Postman Snapshot

I manually created the tables and rows with the following postgres scripts:

CREATE TABLE graduates (id SERIAL PRIMARY KEY, name TEXT);

CREATE TABLE offers (id SERIAL PRIMARY KEY, title TEXT, graduate_id INTEGER REFERENCES graduates (id) ON DELETE CASCADE);

INSERT INTO graduates (name) VALUES ('Elie'), ('Michael'), ('Matt'), ('Joel');

INSERT INTO offers (title, graduate_id) VALUES ('Teacher', 1), ('Super Teacher', 2), ('Mathematician', 3), ('Developer', 4), ('Super Doctor 1', 3), ('Super Doctor 2', 4), ('Super Developer 1', 2);

A snippet of my graduates' route for POST request is as follows;

// This route is mounted on /graduates in app.js

router.post("/", async (req, res, next) => {
    try {
        const result = await db.query(
            "INSERT INTO graduates (name) VALUES ($1) RETURNING *", 
            [req.body.name]
        );
        return res.status(201).send(result.rows[0]);
    } catch(err) {
        return next(err);
    }
});

I look forward to an answer. Thanks.

Answer 1

You need a parser to getthe name from request body. Now there's one unbuilt with express. Add these two lines at the top and it will work:

app.use(express.json())
app.use(express.urlencoded({ extended: false }))