Developer Tools · head to head
ESLint vs Microsoft Defender
Microsoft Defender
Cybersecurity
Always-on protection for you and your family's data and devices
- From
- $12/month
- Free plan
- No
The short version
- Only ESLint has a free tier, so it costs nothing to try first.
- Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Microsoft Defender defender Suite requires existing Microsoft 365 E3 or equivalent base licensing
- Prices and features above were last checked on 29 August 2026.
Where they differ
Only the attributes on which ESLint and Microsoft Defender actually diverge.
| Attribute | ESLint | Microsoft Defender |
|---|---|---|
| Starting price | Free | $12/month |
| Pricing model | Unknown | subscription |
| Free tier | Yes | No |
| Platforms | Browser-based JavaScript, Node.js, Any JavaScript environment | Web |
| Category | Developer Tools | Cybersecurity |
| Founded | 2019 | Unknown |
Identical on both: user rating (Not yet rated).
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 Microsoft Defender
- Automatically fixing issues with syntax-aware rewritesnot Microsoft Defender
- Enforcing a consistent code style across a teamnot Microsoft Defender
- Running as a CI step to block non-conforming codenot Microsoft Defender
- Writing custom rules for project-specific conventionsnot Microsoft Defender
Microsoft Defender
- Endpoint security and threat protectionnot ESLint
- Identity and access securitynot ESLint
- Email threat protectionnot ESLint
- SaaS application security monitoringnot 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
Microsoft Defender
- Defender Suite requires existing Microsoft 365 E3 or equivalent base licensing
- Some Defender products use pay-as-you-go pricing with variable costs
- Prices vary based on Microsoft agreements, requiring sales contact for custom quotes
Pricing, plan by plan
ESLint
FreeNo published plan breakdown. See the ESLint review.
Microsoft Defender
$12/month- Microsoft Defender Suite$12/month
- Endpoint protection
- Identity threat detection
- Email security
- Microsoft 365 E5 with Defender$60/month
- Includes Defender Suite
- Microsoft Teams included
- Comprehensive security and compliance
- Microsoft Defender Vulnerability Management Add-on$2/month
- Vulnerability scanning and management
- One-month free trial available
- Annual commitment required
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 Microsoft Defender if
Nothing in the data separates Microsoft Defender from ESLint on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is ESLint or Microsoft Defender better?
- Neither clearly leads. ESLint starts at Free and Microsoft Defender at $12/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, ESLint or Microsoft Defender?
- ESLint has a free tier; the other does not. Paid plans start at Free for ESLint and $12/month for Microsoft Defender.
- Does ESLint or Microsoft Defender run on more platforms?
- ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Microsoft Defender runs on Web.
- Can I use ESLint for free?
- Yes. ESLint has a free tier, so you can try it without paying. Microsoft Defender starts at $12/month.
- 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 Microsoft Defender is typically brought in for.
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.
SourceMicrosoft Defender: How much does Microsoft Defender Suite cost?
Microsoft Defender Suite costs $12/user/month (paid yearly), but requires existing Microsoft 365 E3 or equivalent base licensing. It includes endpoint protection, identity threat detection, email security, and SaaS application monitoring.
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.
SourceMicrosoft Defender: What add-ons are available for Microsoft Defender?
Microsoft Defender Vulnerability Management Add-on costs $2/user/month with annual commitment and includes a one-month free trial. Additional pay-as-you-go products include External Attack Surface Management, Cloud Security Posture Management, and Sentinel.
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.
SourceMicrosoft Defender: Is Defender included in Microsoft 365 E5?
Yes, Microsoft Defender Suite is included in Microsoft 365 E5 at $60/user/month (paid yearly with Teams). Prices may vary based on Microsoft agreements, requiring contact with Sales for customized quotes.
SourceRelated pages
More on Microsoft Defender
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