So, I&#39;m diving deeper and deeper into **Clojure.Spec**.

One thing I stumbled upon is, **where to put my specs**. I see three options:


# Global Spec File

In most examples, I found online, there is one big `spec.clj` file, that gets required in the main namespace. It has all the `(s/def)` and `(s/fdef)` for all the &quot;data types&quot; and functions.

Pro: 

* One file to rule them all

Contra:

* This file can be big
* Single Responsibliy Principle violated?


# Specs in production namespaces

You could put your `(s/def)` and `(s/fdef)` right next to your production code. So that, the implementation and the spec co-exist in the same namespace.

Pro:

* co-location of implementation and spec
* one namespace - one concern?

Contra:

* production code could get messy
* one namespace - two concerns?

# Dedicated spec namespace structure

Then I thought, maybe Specs are a third kind of code (next to production and test). So maybe they deserve their own structure of namespaces, like this:

    ├─ src
    │&#160; └─ package
    │   &#160; ├─ a.clj
    │   &#160; └─ b.clj
    ├─ test
    │&#160; └─ package
    │   &#160; ├─ a_test.clj
    │   &#160; └─ b_test.clj
    └─ spec
     &#160; └─ package
        &#160; ├─ a_spec.clj
        &#160; └─ b_spec.clj

Pro:

* dedicated (but related) namespaces for specs

Contra:

* you have to source and require the correct namespaces

---

Who has experience with one of the approaches?  
Is there another option?  
What do you think about the different options?

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Where to put specs for Clojure.Spec?