docs: add manual setup guide for Handlebarsdocs

[VikramSinghRakwal06]

Description

This PR addresses a documentation gap in the "Using template engines with Express" guide. Currently, the documentation assumes users are using the express-generator. Developers building applications manually often encounter Error: Module "handlebars" does not provide a view engine because the core handlebars package is not Express-compliant without a wrapper.

Changes

• Added a Manual Setup (Without Generator) section.
• Included a clear code example for manually configuring the express-handlebars engine using app.engine().
• Clarified the distinction between the core library and the necessary Express adapter.

Impact

Improves the developer experience (DX) for users building minimal or custom Express configurations, reducing common setup errors.

Related Issues

Fixes #2128

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[ShubhamOulkar]

Hi @VikramSingh-vartagram, new added section breaks original flow of the document. Also, I think these changes are irrelevant because line no.22 already shows how to set view engine.

[VikramSinghRakwal06]

Thank you for the feedback! While line 22 explains how to toggle the view engine setting, it assumes the engine is already Express-compliant out of the box (like Pug). ​Many users building apps manually (without the generator) run into issues with Handlebars because it requires an explicit app.engine() configuration to work with Express. My goal was to provide the missing setup logic for these non-default engines to prevent common 'Module does not provide a view engine' errors. ​If you feel the separate section breaks the flow, would you prefer I integrate this example directly into the 'Manual Setup' notes or as a sub-bullet under the view engine property?

…

On Tue, 13 Jan 2026, 11:48 shubham oulkar, ***@***.***> wrote: ***@***.**** requested changes on this pull request. Hi @VikramSingh-vartagram <https://github.com/VikramSingh-vartagram>, new added section breaks original flow of the document. Also, I think these changes are irrelevant because line no.22 already shows how to set view engine. — Reply to this email directly, view it on GitHub <#2154 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BISEOCBMSTK4MDGFHOEVLCL4GSE4NAVCNFSM6AAAAACRPM4K36VHI2DSMVQWIX3LMV43YUDVNRWFEZLROVSXG5CSMV3GSZLXHMZTMNJUGAZTENZWGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>