Technology · head to head
Envoy vs ESLint
Envoy
Technology
A high-performance L7 proxy written in C++ that is configured by an API rather than a config file, and is usually deployed under a control plane.
- From
- Free
- Free plan
- Yes
The short version
- Each has a real cost: Envoy the configuration surface is very large and hand-written bootstrap YAML runs to hundreds of lines for routing that Nginx expresses in twenty, which is why nearly every production deployment sits under a control plane and inherits that control plane's constraints as well.; ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Envoy and ESLint 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 Envoy
- xDS dynamic configuration
- Protocol breadth
- Filter chain architecture
- Observability by default
- Outlier detection
- Traffic shaping
- mTLS termination and origination
- Hot restart
Only in ESLint
Nothing recorded that Envoy does not also cover.
What people use each for
The jobs each tool is most often brought in to do.
Envoy
- Acting as the data plane under a service mesh or Gateway API implementation, which is how the overwhelming majority of deployments use itnot ESLint
- An edge or API gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxyingnot ESLint
- Migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow trafficnot ESLint
- Standardising observability across a polyglot estate, so that latency, error rates and tracing look the same regardless of the language a service is written innot ESLint
ESLint
- Statically analysing JavaScript and JSX to find problems before runtimenot Envoy
- Automatically fixing issues with syntax-aware rewritesnot Envoy
- Enforcing a consistent code style across a teamnot Envoy
- Running as a CI step to block non-conforming codenot Envoy
- Writing custom rules for project-specific conventionsnot Envoy
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Envoy
- The configuration surface is very large and hand-written bootstrap YAML runs to hundreds of lines for routing that Nginx expresses in twenty, which is why nearly every production deployment sits under a control plane and inherits that control plane's constraints as well.
- xDS is the real API and it is not stable in the comfortable sense; the v2 API set was removed outright, resource types continue to be deprecated, and your control plane and Envoy binaries have to be upgraded roughly in step or the proxies stop accepting configuration.
- Extending it properly means writing a C++ filter and building and maintaining your own Envoy binary; the alternatives are Lua, which adds per-request overhead, and proxy-wasm, whose ABI has remained effectively experimental for years with a real performance cost.
- At sidecar density the per-proxy memory and CPU footprint is a measurable share of cluster capacity, since thousands of workloads each carry a full proxy, and this is precisely the cost that has pushed mesh projects towards node-level or ambient architectures.
- There is no single vendor selling support for Envoy itself; you get the community plus control-plane vendors such as Solo.io and Tetrate, so an Envoy-level production bug is your own engineers in a C++ codebase unless a support contract happens to cover it.
- Diagnosing why a request got a particular response involves reading config dumps, the stats endpoint and the RESPONSE_FLAGS codes in access logs rather than a readable error, which is a specific skill you must hire or spend months growing.
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
Pricing, plan by plan
Envoy
FreeNo published plan breakdown. See the Envoy review.
ESLint
FreeNo published plan breakdown. See the ESLint review.
Which should you pick?
Choose Envoy if
- You need xds dynamic configuration.
- You want to start without paying.
- You also want protocol breadth.
Choose ESLint if
- You want to start without paying.
- You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
Questions people ask
- Is Envoy or ESLint better?
- Neither clearly leads. Envoy starts at Free and ESLint at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Envoy or ESLint?
- Envoy starts at Free and ESLint at Free.
- Does Envoy or ESLint run on more platforms?
- Envoy runs on Web. ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment.
- Can I use Envoy for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Envoy best used for?
- Envoy is most often used for acting as the data plane under a service mesh or gateway api implementation, which is how the overwhelming majority of deployments use it, an edge or api gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxying, migrating traffic between service versions or between a monolith and its replacement, using weighted splits and shadow traffic, standardising observability across a polyglot estate, so that latency, error rates and tracing look the same regardless of the language a service is written in. Of those, acting as the data plane under a service mesh or gateway api implementation, which is how the overwhelming majority of deployments use it and an edge or api gateway that needs per-route retry budgets, circuit breaking and outlier detection rather than round-robin proxying are not what ESLint is typically brought in for.
- What can Envoy do that ESLint cannot?
- Envoy covers xDS dynamic configuration, Protocol breadth, Filter chain architecture, Observability by default.
Answered from the vendors’ own pages
Envoy: Should I run Envoy on its own, or under a control plane?
Almost always under one. Directly authoring xDS or static bootstrap configuration is viable for a handful of routes and becomes unmanageable beyond that. Envoy Gateway, Istio, Contour, Gloo and Consul all exist to generate that configuration for you.
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.
SourceEnvoy: How does it compare with Nginx or HAProxy?
Envoy is dynamically configured over an API and instrumented far more heavily; Nginx and HAProxy are faster to configure and lighter for straightforward reverse proxying. If you never need to change routing without a reload, Envoy is more machinery than the problem requires.
ESLint: 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.
SourceEnvoy: What does it cost?
Nothing to licence; it is Apache 2.0 and there is no paid edition. The cost is engineering time and, for most organisations, a commercial control plane or cloud service that packages it.
ESLint: 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.
SourceEnvoy: Can I write extensions without C++?
You can write Lua filters or proxy-wasm modules in Rust, Go, C++ or AssemblyScript. Both carry per-request overhead compared with a native filter, and the Wasm path has been slower to stabilise than the project originally projected.
Envoy: Is it a CNCF project?
Yes, it is a graduated CNCF project licensed under Apache 2.0, which means the trademark and governance sit with the foundation rather than with Lyft or any vendor.
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