Firebase cloud functions catch/handle error

Question

Update Question: error: TypeError: res.json is not a function

I use Firebase Cloud Functions with Express app. I use middleware for handle error, but it is not working. How to catch/handle error when using throw new Error()?

My code below:

app.get('/test', (req, res) => { throw new Error('this is error') }) function errorHandler(err, req, res, next) { res.json({error: err.message}) // error here } app.use(errorHandler) exports.api = functions.https.onRequest(app)

Please help me. Thanks very much.

Can you share what documentation you used for the code and how you are planning to implement the error catcher? — Andres Fiesco Casasola
– Andres Fiesco Casasola, Commented Mar 9, 2022 at 15:08

Bullfrog · Accepted Answer · 2022-08-13 23:26:42Z

I had the same issue. You need a try/catch to capture the error and then use the next function to pass it down the middleware chain.

app.get('/test', (req, res, next) => { try { throw new Error('this is error') } catch (err) { next(err) } }) function errorHandler(err, req, res, next) { res.json({error: err.message}) // error here } app.use(errorHandler) exports.api = functions.https.onRequest(app)

Wrap the whole handler in the try block and it will always pass it down to the error handler.

Shahzaib Ayyub · Accepted Answer · 2022-03-08 23:30:04Z

0

You can use try/catch to handle error like this:

app.get('/test', (req, res) => { try { // Your Code } catch (e) { console.error("error: ", e); res.status(500).send(e.message); } })

answered Mar 8, 2022 at 23:30

Shahzaib Ayyub

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1 Comment

PhongBM Over a year ago

I want to handle errors in one common place, because I have many functions. With Express app only, it work well. With express app only, it work well.

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