Developer Tools · head to head
ESLint vs Fastly
The short version
- Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Fastly bandwidth is priced per region, and delivery to India, Africa and South Korea is $0.28 per GB against $0.12 in North America and Europe
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which ESLint and Fastly actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in ESLint
Nothing recorded that Fastly does not also cover.
Only in Fastly
- Edge Compute
- CDN
- DDoS Protection
- Real-time Analytics
- Image Optimization
- Video Streaming
- API
- Instant Purge
What people use each for
The jobs each tool is most often brought in to do.
ESLint
- Statically analysing JavaScript and JSX to find problems before runtimenot Fastly
- Automatically fixing issues with syntax-aware rewritesnot Fastly
- Enforcing a consistent code style across a teamnot Fastly
- Running as a CI step to block non-conforming codenot Fastly
- Writing custom rules for project-specific conventionsnot Fastly
Fastly
- Serving static and dynamic content through a global CDNnot ESLint
- Running edge logic and caching in front of an origin applicationnot ESLint
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
ESLint
- Slow performance on large codebases compared to newer tools like Oxlint and Biome
- Complexity in configuration from scratch, particularly for TypeScript support
- Limited built-in TypeScript support, requiring separate parsers and coordination with new TypeScript features
Fastly
- Bandwidth is priced per region, and delivery to India, Africa and South Korea is $0.28 per GB against $0.12 in North America and Europe
- The same traffic therefore costs more than twice as much depending on where the audience is, which is invisible until the bill arrives
- The free allowance is 100 GB of bandwidth and 1M requests a month
- Requests are billed separately from bandwidth, at $0.01 per 10,000 above the first million
- High volume rates past 50 TB are not published and require contacting sales
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
Fastly
Free- Free TrialFree
- CDN
- DDoS protection
- Real-time analytics
- Pay-As-You-GoFree
- Usage-based pricing
- Advanced features
- Priority support
Which should you pick?
Choose ESLint if
- You want to start without paying.
- You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
Choose Fastly if
- You need edge compute.
- You want to start without paying.
- You work on Web, Api.
- You also want cdn.
Questions people ask
- Is ESLint or Fastly better?
- Neither clearly leads. ESLint starts at Free and Fastly at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or Fastly?
- ESLint starts at Free and Fastly at Free.
- Does ESLint or Fastly run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Fastly runs on Web, Api.
- Can I use ESLint for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is ESLint best used for?
- ESLint is most often used for statically analysing javascript and jsx to find problems before runtime, automatically fixing issues with syntax-aware rewrites, enforcing a consistent code style across a team, running as a ci step to block non-conforming code. Of those, statically analysing javascript and jsx to find problems before runtime and automatically fixing issues with syntax-aware rewrites are not what Fastly is typically brought in for.
- What can ESLint do that Fastly cannot?
- Fastly covers Edge Compute, CDN, DDoS Protection, Real-time Analytics.
Answered from the vendors’ own pages
ESLint: Does ESLint automatically fix code issues?
Many problems ESLint finds can be automatically fixed via the --fix flag. ESLint fixes are syntax-aware so you won't experience errors introduced by traditional find-and-replace algorithms.
SourceFastly: Does Fastly charge based on usage or a flat monthly fee?
Fastly operates on a usage-based model with volume discounts. They offer a free tier with 100 GB bandwidth and 1M requests for experimentation, then customers pay per unit consumed with tiered discounts as consumption increases.
SourceESLint: How much does ESLint cost?
ESLint is completely free and open-source software maintained by the OpenJS Foundation. The project accepts voluntary donations from sponsors.
SourceFastly: What are Fastly's main service packages and their costs?
Fastly offers Network Services Packages ($1,500-$6,000/month baseline), Security Packages (custom pricing), Compute Packages ($500/month entry level), and Observability Packages ($1,500/month entry level). Enterprise solutions include custom quotes for high-volume deployments.
SourceESLint: Can I write custom ESLint rules?
Yes. You can develop custom rules that work alongside built-in functionality through ESLint's plugin system, allowing complete customization for your project needs.
SourceFastly: Can I start using Fastly for free?
Yes, Fastly offers a free tier with generous allowances for experimentation including 100 GB bandwidth and 1M requests. You can start building free and only pay when you use additional resources.
SourceFastly: Are there surprise overage charges with Fastly?
Fastly advertises predictable pricing with no surprise overages. The pricing structure is designed to be transparent as consumption grows.
SourceRelated pages
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- Fastly vs DigitalOcean
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- Fastly vs Akamai
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- Fastly vs Jaeger
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