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---
layout: ../../layouts/content.astro
title: SSL Certificates
description: How to use HTTPs during development and generate SSL certifcates for your Snowpack build.
---
<div class="notification">
This guide has an example repo:
<a href="https://github.com/snowpackjs/snowpack/tree/main/examples/https-ssl-certificates/">
examples/https-ssl-certificates
</a>
</div>
```
npm start -- --secure
```
Snowpack provides an easy way to use a local HTTPS server during development through the use of the `--secure` flag. When enabled, Snowpack will look for a `snowpack.key` and `snowpack.crt` file in the root directory and use that to create an HTTPS server with HTTP2 support enabled.
### Generating SSL Certificates
You can automatically generate credentials for your project via either:
- [devcert (no install required, but openssl is a prerequisite)](https://github.com/davewasmer/devcert-cli): `npx devcert-cli generate localhost`
- [mkcert (install required)](https://github.com/FiloSottile/mkcert): `mkcert -install && mkcert -key-file snowpack.key -cert-file snowpack.crt localhost`
In most situations you should add personally generated certificate files (`snowpack.key` and `snowpack.crt`) to your `.gitignore` file.
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