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[BUG] Cannot validate webhook

See original GitHub issue

Bug Report

Describe the bug There is an error during Webhook validation (the code used to work previously) This happened in middleware when /webhook was called

To Reproduce

Steps to reproduce the behavior: 0. You may or may not use the code from my repo (

  1. Used node line bot sdk and created a /webhook that looks like this'/webhook', line.middleware(config), (req, res) => {
        .then((result) => res.json(result));
  1. Test webhook from Line developers website and check the log
2020-06-15T08:15:23.078099+00:00 heroku[router]: at=info method=POST path="/webhook" request_id=5b01db7e-532a-436b-8ba5-c55993174f61 fwd="" dyno=web.1 connect=1ms service=23ms status=500 bytes=404 protocol=https
2020-06-15T08:15:23.079280+00:00 app[web.1]: TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Object
2020-06-15T08:15:23.079323+00:00 app[web.1]:     at Hmac.update (internal/crypto/hash.js:82:11)
2020-06-15T08:15:23.079324+00:00 app[web.1]:     at Object.validateSignature [as default] (/app/node_modules/@line/bot-sdk/dist/validate-signature.js:14:69)
2020-06-15T08:15:23.079325+00:00 app[web.1]:     at _middleware (/app/node_modules/@line/bot-sdk/dist/middleware.js:36:42)
2020-06-15T08:15:23.079326+00:00 app[web.1]:     at processTicksAndRejections (internal/process/task_queues.js:97:5)

The error seems to happen in validate-signature and the type of data seems to be incorrect but I can’t investigate any further.

Expected behavior There should be no error

Environment (please complete the following information):

  • OS: Mac OS X 10.15.5
  • Node.js 12.6.0
  • line-bot-sdk-nodejs 6.8.4

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:7 (3 by maintainers)

github_iconTop GitHub Comments

gie3dcommented, Jun 16, 2020

Thanks @xingoxu @EriecTanijaya, it really was because of the body-parser. My apologise, the code I pushed to heroku was a little different from the git as I didn’t push it to my github repo 😥

Changing from

app.use('/webhook', line.middleware(config));'/webhook', (req, res) => {
	Promise.all( => res.json(result));


app.use('/webhook', line.middleware(config));
app.use(bodyParser.json());'/webhook', (req, res) => {
	Promise.all( => res.json(result));

as suggested in did solve the problem.

Many thanks 👍

xingoxucommented, Jun 15, 2020
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