ESLint
Static analysis tool that identifies and fixes issues in JavaScript code
- Also known as
- eslint
What is ESLint?
An open-source linter and fixer for JavaScript and JSX that runs locally in editors and CI pipelines. It uses AST analysis to catch problems and can automatically fix many issues, with full support for custom rules and extensibility.
ESLint pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
Free open source
Open Source
FreeFree open source linter
- Find issues in JavaScript code
- Automatically fix problems
- Custom parsers
- Custom rules
- Text editor integration
- CI pipeline integration
What ESLint does
The capabilities that matter for code quality tools, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Function
- Linter + formatter
- Language scope
- Single-language
- Implementation language
- JavaScript
- Autofix
- ✓
- Config model
- Config file
- Custom rules
- ✓
- Deployment
- CLI-local
- Editor integration
- ✓
- CI / VCS gating
- ✓
- Code metrics
- -
- Incremental / monorepo aware
- -
- Open-source
- OSS
- Pricing model
- Free
Platform & deployment
Independently observed- CLI
- Self-hosted
Integrations (2)
Independently observed- eslint-plugin-react
- eslint-plugin-unicorn
Security & compliance
Known vulnerabilities: 2 (1 in the last 12 months), max severity MODERATE sourcea count reflects scale & disclosure, not quality
ESLint FAQ
Common questions about ESLint, answered from independent, dated evidence.
What is ESLint?
An open-source linter and fixer for JavaScript and JSX that runs locally in editors and CI pipelines. It uses AST analysis to catch problems and can automatically fix many issues, with full support for custom rules and extensibility. It is indexed under Code Quality Tools.
Source: https://eslint.org
Is ESLint free to use?
ESLint is open source, so it can be self-hosted and used at no licence cost. It is released under the MIT licence. Pricing changes often, so verify at source before relying on it.
Source: https://eslint.org
What platforms does ESLint support?
ESLint supports a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Source: https://eslint.org
Can ESLint be self-hosted?
Yes. ESLint can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://eslint.org
Is ESLint open source?
Yes. ESLint is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Source: https://github.com/eslint/eslint
ESLint alternatives
Other code quality tools we track, ranked by the same independent score.
- PrettierA code formatter that automatically enforces consistent style across projectshigh · 79%
- StyleLintA tool for checking CSS code for errors and style inconsistenciesmedium · 72%
- Ruffmedium · 68%
- BlackAn opinionated Python code formatter that automatically reformats code to a consistent stylehigh · 79%
- BiomeA unified code formatter and linter for web developmentmedium · 67%
- mypyStatic type checker for Pythonmedium · 67%
Compare ESLint
Side by side against other code quality tools, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for ESLint, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Package downloads | 100 | 0.17 | 17.3 | ✓ |
| Dependent projects | 100 | 0.08 | 8.0 | ✓ |
| Development activity | 53 | 0.12 | 6.3 | ✓ |
| Release cadence | 93 | 0.07 | 6.2 | ✓ |
| Capabilities | 67 | 0.08 | 5.6 | ✓ |
| Security score | 65 | 0.05 | 3.4 | ✓ |
| Stars | 84 | 0.03 | 2.8 | ✓ |
| Integrations | 14 | 0.05 | 0.7 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 46 | mediumsource · 2026-09-10 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 68% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Autofix: Yes · Function: linter_formatter · Ci gating: Yes · Deployment: cli_local · Open source: oss · Config model: config_file | mediumsource · 2026-09-14 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 2 | mediumsource · 2026-08-14 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | JavaScript | highsource · 2026-09-10 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-09-10 · 99% |
Pricing
Release
Security
Is ESLint the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank ESLint against the rest of the code quality tools we index, using the same dated evidence weighted your way.
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