faast.js
faast.js: A focused way to run JavaScript batch workloads on AWS Lambda or locally. Ranked #26 of 36 in Serverless Development Frameworks by our editors (6.2/10); pricing: Free plan; best for javaScript teams deploying small AWS Lambda functions.
At a glance
- Editor score6.2 / 10
- PricingFree plan
- Best forJavaScript teams deploying small AWS Lambda functions
- Free planYes
- Paid fromFree
- Deployment targetsAws
- Facts checked23 Oct 2026
Where it wins
- Bundles JavaScript and TypeScript dependencies with webpack
- Offers local process execution for development and testing
- Includes concurrency controls, cost analysis, logs, and infrastructure cleanup
Where it doesn't
- AWS Lambda is the only documented cloud deployment target
- Cloud execution requires users to supply their own AWS account
- Community and documentation are the listed support channels
Our verdict on faast.js
faast.js is an open-source Node.js library that turns exported JavaScript and TypeScript functions into callable serverless functions on AWS Lambda. Its batch-workload focus suits solo developers and small teams who want to invoke functions concurrently without managing packaging and infrastructure steps themselves. A local provider runs functions in separate processes for development and testing, so the library can also fit workflows that need local execution before cloud runs.
The main appeal is the focused execution workflow: webpack bundles dependencies, and configurable concurrency, memory allocation, and timeouts help shape workload behavior. Async generators can yield intermediate results, while invocation links provide access to logs. Cost snapshots and workload cost analysis add visibility into execution costs. Integrations include AWS SNS, AWS SQS, and AWS CloudWatch Logs alongside Lambda. This is a library rather than a hosted service, so cloud execution relies on the user's AWS account, and provider usage costs are separate from the library.
Its cloud scope is narrow: AWS Lambda is the documented deployment target, with no Kubernetes support. That makes faast.js a sensible fit when JavaScript or TypeScript batch functions map cleanly to Lambda and local process execution is useful during development. Teams seeking deployment across multiple cloud providers, or a hosted service that abstracts away an AWS account, should look elsewhere. Support is through community and documentation, so buyers should be comfortable working within that model.
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faast.js pricing
faast.js fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Deployment targets | Aws |
| Local testing | Yes |
| Application packaging | Yes |
| Kubernetes support | No |
| Supported languages | Javascript |
| Deployment rollback | Not verified |
| Deployment model | Cloud_functions |
| Deployment | Cloud, Self-hosted |
| Platforms | Linux, macOS, Windows |
| Support | Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 4 integrations: AWS Lambda, AWS SNS, AWS SQS, AWS CloudWatch Logs |
| Pricing | Free plan |
| Website | faastjs.org |
| Facts checked | 23 Oct 2026 |
faast.js integrations
faast.js lists 4 integrations on its own site.
- AWS Lambda
- AWS SNS
- AWS SQS
- AWS CloudWatch Logs
Alternatives to faast.js
- Serverless FrameworkAn open-source, YAML-driven AWS framework with optional hosted deployment and monitoring tools.9.2
- AWS Serverless Application Model (AWS SAM)A free AWS-focused toolkit for defining, deploying, and locally debugging serverless apps.9.1
- Apache OpenWhiskA portable, self-managed framework for event-driven functions, with Kubernetes and Docker support.8.8
See all faast.js alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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