Function-as-a-Service (Faas)

Wasmer is a market leader for enabling WebAssembly on the server. It nearly eliminates all the challenges developers must deal with to fully adopt FaaS as a part of their application development strategy.


FaaS applications have many advantages. However, as with most technology, there are also equally as many challenges and tradeoffs.

Cold Starts

Functions are not always available in memory. The resulting delay in execution disqualifies FaaS from certain types of applications or forces developers to deploy workarounds that add to the cost of deployment.

Vendor Lock-in

Functions deployed to AWS Lambda may become difficult to push to a different cloud provider, especially if other AWS services like S3 or RDS are critical components of your application's architecture.

Local Reproducibility

Testing or reproducing vendor platform functionality on local infrastructure is complex and may rely on community-supported workarounds (e.g., Miniflare).

Hidden Costs

FaaS platforms are fully managed services obscure to the user and often create unintended costs during peak activity if left unsupervised.


Fully managed platforms may be slow to remediate security issues or may not fully adhere to regulations specific to your business needs (e.g., GDPR, SOX, HIPPA, etc.)

Wasmer Benefits

Fast Startup Times

Wasmer enables precompilation of Wasm modules for ultra-fast and responsive startup times.

No Vendor Lock-in

Wasm modules get compiled to universal binaries that can be adapted to run on any provider's infrastructure quickly.

Local Reproducibility

The Wasmer Runtime makes it possible to run and test all of your service components locally.

Legacy Support

Compile legacy server-side code to WebAssembly and run it as a function.

Development Efficiency

Eliminate extraneous development costs and enable developers to work with languages they know and love.

Wasmer is an open-source runtime for executing WebAssembly on the Server.