What libraries do you pull in for a fresh project?

CompareChain!

Mishka Chelekom, igniter, Ash

freedom_formatter, ecto_dev_logger, mix_test_interactive

If you aren’t Ash’ing then Flop along with Flop.Phoenix along with Let Me covers all of pagination/filtering/sorting/authz in a pretty nice way. Ash was, in part, born out of not having these basic necessities but if you aren’t going to use Ash (which is of course totally fine) then these help a lot (and play nicely together). I really don’t like to ping but these libs are all by @woylie who has another very helpful one in ecto_nested_changeset. Really, I wish Phoenix had out-of-the-box solutions for all of these thing, even just as generators (a la phx_gen_auth) as it’s all stuff every project needs.

There’s also Sobelow.

To be a little catty and flip the question, I intentionally shun any type of “helper” libraries (I’ll pick on Moar as an example) and argue loudly against them in a team situation. At best they are unnecessary.

Quokka for formatting,
Faker for fuzzing test data.

Keep it lightweight is my usual advice.

Here’s my list off the top of my head.

For application code

Flop
Oban
Req
TypedEctoSchema

Formatting / tools etc

BlitzCredoChecks
Credo
CredoContrib
CredoNaming
Dialyxir
Sobelow

Testing

mix test.interactive
PhoenixTest

For virtually every application:

• credo
• dialyxir (probably not needed any more once the type system is finished?)
• excoveralls
• ex_machina
• logger_json
• mix_audit
• sobelow

The rest depends on the need of the application.

I’m a co-author of Moar and I agree with your statement … check out the very first line in its readme:

A dependency-free utility library containing 100+ useful functions. Add the library to your project, or just copy and paste the bits that you want.

The library was extracted from a bunch of code that I copied and pasted between projects (I’ve built 20+ Phoenix projects by now) and putting it in a public library is the easiest way to reuse it.

Moar and similar libraries probably have at least a few functions that are useful for others, so I’d recommend perusing the docs to see if anything jumps out at you, and then consider copying that code (and modifying it as needed), or adding the library to your project (Moar is dependency-free, and I assume most other utility libraries are). Moar’s docs have a short list of other utility libraries; if you are the author of such a library, feel free to add it to Moar’s docs.

Besides Moar (see above), I add these libraries to all my projects (I’m an author of some of them):

• Boundary
• Credo
• Dialyxir
• HtmlQuery
• Magritte
• MixAudit
• Pages
• SchemaAssertions
• Supra
• Tablerone
• TinyMaps

I like to avoid dependencies whenever I can, there is only one I’d add without much thinking:

Timex

On more serious projects:

Mox
ExMachina
Credo
Dialyxir