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An application programming interface (API) key is a secret unique identifier used to authenticate and authorize a user, developer, or calling program to an API.cite-ref-0-1-0[1]cite-ref-3-2-0[2]

Cloud computing providers such as Google Cloud Platform and Amazon Web Services recommend that API keys only be used to authenticate projects, rather than human users.cite-ref-3[3]cite-ref-4[4]

• Usage

• HTTP APIs

• Security

• Incidents

• References

• Book sources

• External links

API keys for HTTP-based APIs can be sent in multiple ways:cite-ref-2-5-0[5]

The access token is often a JSON Web Token (JWT) in the HTTP Authorization header:

In the query string:

As a request header:

As a cookie:

API keys are generally not considered secure; they are typically accessible to clients, making it easy for someone to steal an API key. Keys often have no expiration, meaning a stolen key can be used indefinitely unless revoked or regenerated.cite-ref-1-6-0[6] Keys are supposed to be a secret known only by the client and server, so they should not be communicated over an insecure channel and can only be considered secure when used in conjunction with other security mechanisms such as HTTPS.cite-ref-2-5-1[5]

There are several risk scenarios when using API keys:

• Developers may write scripts that contain keys in plaintext.cite-ref-3-2-1[2]

• Developers may hard-code keys into source code, and forget that when they release the code.cite-ref-3-2-2[2]

• Having unprotected keys in mobile apps is dangerous.cite-ref-3-2-3[2]

These risks generally stem from the key being in plaintext, which is potentially accessible to adversaries.cite-ref-3-2-4[2]

In 2017, Fallible, a Delaware-based security firm examined 16,000 Android apps and identified over 300 which contained hard-coded API keys for services like Dropbox, Twitter, and Slack.cite-ref-7[7]

cite-note-0-11. ↑ "API Key - What is an API Key?". Last Call - RapidAPI Blog. Retrieved 2019-09-20.

cite-note-3-22. ↑ citerefluLu, HongQian 2014. Keeping Your API Keys in a Safe. IEEE 7th International Conference on Cloud Computing. doi:10.1109/CLOUD.2014.143.{{cite conference}}: CS1 maint: numeric names: authors list (link)

cite-note-33. ↑ "What is an API Key? - API Keys and Tokens Explained - AWS". Amazon Web Services, Inc. Retrieved 2024-09-01.

cite-note-44. ↑ "Why and when to use API keys | Cloud Endpoints with OpenAPI". Google Cloud. Retrieved 2024-09-01.

cite-note-2-55. ↑ "API Keys". Archived from the original on 2019-10-17.

cite-note-1-66. ↑ "Why and when to use API keys | Cloud Endpoints with OpenAPI". Google Cloud. Retrieved 2019-09-20.

cite-note-77. ↑ "Hundreds of popular Android apps contain hard-coded secret keys". ZDNet. Retrieved 2022-06-20.

• citerefde2017De, Brajesh (2017). API management: an architect's guide to developing and managing APIs for your organization (1st ed.). New York: Apress. ISBN 978-1-4842-1305-6. OCLC 978273106.

• Why and When to Use API Keys