# Sharing tips and tricks with others in the Postman community

**URL:** <https://community.postman.com/t/sharing-tips-and-tricks-with-others-in-the-postman-community/5123>\
**Category:** Help Hub\
**Created:** [April 24, 2019, 12:15pm UTC](https://community.postman.com/t/sharing-tips-and-tricks-with-others-in-the-postman-community/5123 "2019-04-24T12:15:14Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![jameshd](https://avatars.discourse-cdn.com/v4/letter/j/da6949/32.png) [@jameshd](https://community.postman.com/u/jameshd)\
**Post date:** [April 26, 2019, 10:38am UTC](https://community.postman.com/t/sharing-tips-and-tricks-with-others-in-the-postman-community/5123/4 "2019-04-26T10:38:46Z")

</div>

# Loosely Detecting Headers

Whilst testing a collection of APIs recently I found myself in a situation whereby I needed to detect if the response was JSON - pretty straight forward really in the grand schema of things. Postman has the `pm.response.headers` collection and the `has` method. However, that’s quite strict and uses exact matching. Some of the responses I was dealing with where inconsistent in their `Content-Type` values. e.g.

```auto
Content-Type: application/json
Content-Type: application/json;charset=utf-8

```

At the time of writing there was no `.contains()` method, so I had to improvise and came up with the following:

```auto
const isJsonResponse = (pm.response.headers.filter((header) => header.value.indexOf('application/json') !== -1).length > 0);

if (isJsonResponse) { 
	... do stuff ... 
}

```

A JavaScript dev I know, improved upon the snippet using object destructing, making it:

```auto
const isJsonResponse = pm.response.headers.filter(({headerValue}) => headerValue.indexOf('application/json') > -1).length;

```

It’s probably not going to change your life, but it’s something to keep in the tool box.

### Oh, and one more thing!

The reason I needed a JSON detection snippet was because I was validating the JSON Schema of the API response. If you’re lazy like me, I can totally recommend a free tool for generating the JSON Schema from existing JSON over at Quicktype IO. Paste your JSON on the left hands side, and choose JSON Schema from the languages drop-down, thus:

[https://app.quicktype.io?share=GxkZCPp7lZ1g3NpWhS6j](https://app.quicktype.io?share=GxkZCPp7lZ1g3NpWhS6j).

---

_[View the full topic](https://community.postman.com/t/sharing-tips-and-tricks-with-others-in-the-postman-community/5123)._