firebase functions using expressjs routes get parameters undefined

Question

I want to use firebase functions to host my expressjs webapp, however all get parameters seem undefined. Whats the problem?

    import functions= require("firebase-functions");
    import admin= require("firebase-admin");
    import express= require("express");
    import bodyParser= require("body-parser");
    const app: express.Application = express();
    admin.initializeApp();

    app.get("/getstory", async (req,resp)=>{
        try{
            const preferred_storyid=req.params.preferred_storyid;
            console.log(`preferred_storyid ${preferred_storyid}`) //logs preferred_storyid undefined. Why?
resp.send("ok");
        }catch (e) {
            resp.send(`erequest_story. ${e}`);
        }
    });
    const faststoryapi = functions.https.onRequest(app);
    module.exports={faststoryapi}

Then the code is deployed with

firebase deploy --only functions

and get request sent by post man

PS: I have noticed that i cant have more than one route eg i cant have more than one post end point or else the second one is not called. How do you guys do it?

Vaibhav Vishal · Accepted Answer · 2020-04-08 11:21:40Z

2

+50

You can do something like this:

...
app.get(async (req,resp) => { // no need of path
    try{
        const preferred_storyid=req.params.preferred_storyid;
        console.log(`preferred_storyid ${preferred_storyid}`) //logs preferred_storyid undefined. Why?
        resp.send("ok");
    } catch (e) {
        resp.send(`erequest_story. ${e}`);
    }
});

const faststoryapi = functions.https.onRequest(app);
module.exports={faststoryapi}

Now you can use your function by hitting the url: https://us-central1-<project-id>.cloudfunctions.net/faststoryapi. The api endpoint will be same as your exported function name, so you can change your function name accordingly.

If you are hosting an express app in cloud function you need to use req.query for url params.
Also in express req.params is used for paths like these:

Route path: /users/:userId/books/:bookId
Request URL: http://localhost:3000/users/34/books/8989
req.params: { "userId": "34", "bookId": "8989" }

So, what you are looking for is req.query.
See this answer for more info

edited Apr 8, 2020 at 11:21

answered Apr 4, 2020 at 7:06

Vaibhav Vishal

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1 Comment

Vaibhav Vishal Over a year ago

btw, actually you can have a whole express app in one cloud function, my bad. realised that just today when I tried it myself.

255kb - Mockoon · Accepted Answer · 2020-04-04 06:51:08Z

0

In Firebase Functions req and res objects are the same than ExpressJS's. To get query params you must use req.query.xxxx, while req.params.xxxx can be used to access path params.

answered Apr 4, 2020 at 6:51

255kb - Mockoon

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