Troubleshooting the ERR_OSSL_EVP_UNSUPPORTED Error in Node.js Projects

Troubleshooting the ERR_OSSL_EVP_UNSUPPORTED Error in Node.js Projects

Encountering errors while running Node.js projects can be frustrating, especially when they’re related to cryptographic operations like the ERR_OSSL_EVP_UNSUPPORTED error. In this guide, we’ll delve into the causes of this error and explore effective solutions to resolve it. Additionally, we’ll discuss the recent changes in Node.js 17 integrating OpenSSL 3.0 and how they impact compatibility with older code or modules.


The ERR_OSSL_EVP_UNSUPPORTED error indicates issues with OpenSSL’s cryptographic operations. OpenSSL, a widely used open-source cryptographic library, imposes stricter rules on algorithms and key sizes with version 3.0 compared to previous versions. This discrepancy in cryptographic standards often triggers the ERR_OSSL_EVP_UNSUPPORTED error.


1. Incompatible Cryptographic Algorithms

 Not all cryptographic algorithms are supported or enabled by default in OpenSSL. Attempting to use an unsupported algorithm can lead to this error.

2. Outdated OpenSSL Version

 Older OpenSSL versions might lack support for newer cryptographic algorithms or features, necessitating an upgrade to resolve compatibility issues.

3. Misconfigurations

 Incorrect configurations in applications or systems utilizing OpenSSL, such as specifying unsupported algorithms or incorrect key sizes, can also cause this error.

Solutions to Fix ERR_OSSL_EVP_UNSUPPORTED Error:

  1. Upgrade Node.js: Ensure you’re using the latest Node.js LTS version to leverage compatibility fixes and enhancements.
  2. Utilize the –openssl-legacy-provider Option: Node.js 17 introduced the –openssl-legacy-provider command-line option, allowing temporary reverting to the legacy OpenSSL provider to bypass tightened restrictions. This option serves as a short-term solution until a permanent fix is implemented.

Implementing the –openssl-legacy-provider Option:

Before running the start command in your terminal, execute the following commands:

– For Mac / Linux:

export NODE_OPTIONS=–openssl-legacy-provider

– For Windows:

 set NODE_OPTIONS=–openssl-legacy-provider


Resolving the ERR_OSSL_EVP_UNSUPPORTED error requires a systematic approach and familiarity with OpenSSL configurations. By upgrading Node.js to the latest LTS version and leveraging the –openssl-legacy-provider option, you can overcome compatibility hurdles and ensure the smooth operation of your cryptographic applications. 

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