# ERROR - Cert-verifier-js XMLHttpRequest

**URL:** <https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516>\
**Category:** Technical\
**Created:** [June 18, 2020, 2:50pm UTC](https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516 "2020-06-18T14:50:00Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Cristian](https://avatars.discourse-cdn.com/v4/letter/c/a698b9/32.png) [@Cristian](https://community.blockcerts.org/u/Cristian)\
**Post date:** [June 18, 2020, 2:50pm UTC](https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516/1 "2020-06-18T14:50:00Z")

</div>

Hi all, i have installes cert-verifier-js…and i am work with node js but when use ES to import the module “@blockcerts/cert-verifier-js” i´m getting the next error:

TypeError: F.XMLHttpRequest is not a constructor

Here is my import code:

import { Certificate } from ‘@blockcerts/cert-verifier-js’;

---

<div class="post-metadata">

**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\
**Post date:** [June 22, 2020, 11:43am UTC](https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516/2 "2020-06-22T11:43:12Z")

</div>

Hi @Cristian,

to run in a node environment you need to use the code exposed in the `lib` directory, as follows:

```auto
const certVerifierJs = require('@blockcerts/cert-verifier-js/lib');

```

This is highlighted in the readme: [https://github.com/blockchain-certificates/cert-verifier-js#running-in-nodejs](https://github.com/blockchain-certificates/cert-verifier-js#running-in-nodejs). This readme is fairly comprehensive so you can use it for reference.

---

<div class="post-metadata">

**Author:** ![Cristian](https://avatars.discourse-cdn.com/v4/letter/c/a698b9/32.png) [@Cristian](https://community.blockcerts.org/u/Cristian)\
**Post date:** [June 23, 2020, 7:38pm UTC](https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516/3 "2020-06-23T19:38:24Z")

</div>

Hi @lemoustachiste thanks…  
But a tried this way too and I got the same error.

---

<div class="post-metadata">

**Author:** ![lemoustachiste](https://avatars.discourse-cdn.com/v4/letter/l/7c8e57/32.png) [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\
**Post date:** [June 23, 2020, 8:35pm UTC](https://community.blockcerts.org/t/error-cert-verifier-js-xmlhttprequest/2516/4 "2020-06-23T20:35:27Z")

</div>

could you open a detailed issue in the cert-verifier-js repo?

Thanks