License-based repository search helps you find open source projects that match your reuse, compliance, research, or contribution needs. Whether you are looking for MIT-licensed JavaScript libraries, Apache-2.0 machine learning tools, or projects with no detected license, search qualifiers can narrow results quickly and consistently.
Most code hosting platforms identify licenses from repository metadata and common license files, then expose that information through search filters. Using the right license syntax, combined with criteria such as language, stars, topics, organization, or activity, makes it easier to locate relevant repositories and avoid results that do not meet your requirements.
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Because license detection is not perfect, search results should be treated as a starting point rather than final legal confirmation. Checking the repository’s license file, package metadata, documentation, and unusual file layouts can help you confirm whether the detected license is accurate or whether a repository has missing or conflicting licensing information.
How License-Based Repository Search Works
License-based repository search depends on license metadata that the hosting platform detects from files in a repository, most commonly a top-level file named LICENSE, LICENSE.md, COPYING, or NOTICE. When the contents of that file match a known open source license, the repository can be indexed under a license identifier such as mit, apache-2.0, gpl-3.0, or bsd-3-clause. Search queries can then use that identifier to return repositories whose detected license matches the requested license.
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The matching process is based on the repository’s detected license, not simply on a text search for words like “MIT” or “Apache.” For example, a repository with a standard MIT License file will usually be searchable with license:mit. A repository that only mentions “MIT” in its README, package metadata, or project description may not appear in those results if the platform has not detected a license file. This distinction matters because license search is designed to surface structured license information rather than arbitrary text mentions.
Most license search systems use normalized license keys derived from well-known identifiers, often aligned with SPDX-style names. That means the query uses a predictable short form instead of the full legal title. For instance, the Apache License 2.0 is commonly searched as license:apache-2.0, the GNU General Public License v3.0 as license:gpl-3.0, and the Mozilla Public License 2.0 as license:mpl-2.0. Exact spelling, hyphenation, and version numbers are significant, so license:gpl may not behave the same as license:gpl-3.0.
Detected license metadata is usually generated automatically and can change when repository files are added, edited, renamed, or removed. If a maintainer adds a standard license file, the repository may become discoverable by license after the next indexing update. If the license text is heavily modified, stored only in a subdirectory, or combined with custom terms, the platform may classify it as an unknown or custom license instead of mapping it to a standard identifier. In those cases, license-based search can miss the repository even though the project appears to be licensed when reviewed manually.
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- Canonical license files: Files such as LICENSE, LICENSE.md, COPYING, or COPYING.txt near the repository root.
- Known license text: Standard wording associated with licenses such as MIT, Apache-2.0, GPL-2.0, GPL-3.0, LGPL, MPL-2.0, BSD-2-Clause, and BSD-3-Clause.
- Repository-level metadata: The single detected license or license expression shown on the repository page, when available.
- Index freshness: Search results may lag behind recent repository changes until indexing completes.
Because license search relies on this detected metadata, it is best treated as a fast discovery tool rather than a final legal review. It can quickly narrow a large set of repositories to projects that appear to use a specific license, but the result should be confirmed by opening the repository and reading the actual license file. This is especially true for projects with mulle components, generated code, vendored dependencies, dual licensing, or additional commercial terms outside the main license file.
Using License Qualifiers in Search Queries
To search for repositories by license, use the license: qualifier followed by a license identifier. On GitHub, these identifiers generally match SPDX license IDs, such as mit, apache-2.0, gpl-3.0, or bsd-3-clause. A basic query looks like license:mit, which returns repositories where the detected license is MIT. This searches repository metadata, not every file in every repository, so it works best when the project has a recognizable license file at the repository root.
You can enter license queries directly in the GitHub search bar and then choose the Repositories result type. For example, license:apache-2.0 finds repositories detected as Apache License 2.0, while license:gpl-3.0 finds repositories using GNU General Public License v3.0. If you are unsure of the exact identifier, check the license name shown on a repository’s main page or use common SPDX-style lowercase forms with hyphens.
Common license query examples
license:mit— repositories detected with the MIT License.license:apache-2.0— repositories detected with Apache License 2.0.license:gpl-3.0— repositories detected with GPL version 3.0.license:bsd-2-clause— repositories detected with the 2-clause BSD license.license:bsd-3-clause— repositories detected with the 3-clause BSD license.license:mpl-2.0— repositories detected with Mozilla Public License 2.0.license:unlicense— repositories detected with The Unlicense.
License qualifiers can be used on their own, but they are usually more useful when paired with keywords. For instance, react license:mit searches for repositories related to React that are detected as MIT licensed. A query such as database license:apache-2.0 narrows results to repositories that mention “database” and use the Apache 2.0 license. Place the keyword anywhere in the query; the qualifier still applies as long as it uses the license: format.
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You can also exclude a license by prefixing the qualifier with a minus sign. For example, cli -license:gpl-3.0 searches for repositories related to command-line tools while excluding repositories detected as GPL 3.0. This is useful when you are reviewing projects for compatibility with internal policies or dependency requirements. Exclusion is not the same as proving a repository has no GPL code, because license detection is based on repository-level metadata, but it helps reduce obvious mismatches during the first pass.
Useful patterns for precise searching
| Goal | Example query |
|---|---|
| Find MIT-licensed API projects | api license:mit |
| Find Apache-licensed machine learning repositories | machine learning license:apache-2.0 |
| Exclude GPL 3.0 results from a keyword search | scheduler -license:gpl-3.0 |
| Search for BSD 3-clause networking projects | networking license:bsd-3-clause |
When testing a license query, open several results and compare the search result label with the repository’s license file. If a repository appears in the results for license:mit, check whether it has a file named LICENSE, LICENSE.md, or similar, and confirm that the detected text matches the license you need. This extra check is especially useful for older projects, projects with mulle license files, or repositories that include third-party code under separate terms.
Combining License Filters with Language, Stars, and Topics
License searches become much more useful when you combine them with other repository filters. Instead of searching for every repository under a license, you can narrow results to a specific programming language, maturity level, community size, or subject area. In GitHub repository search, the license: qualifier can be used alongside qualifiers such as language:, stars:, topic:, created:, pushed:, and org:.
For example, to find MIT-licensed Python repositories related to machine learning, search for license:mit language:Python topic:machine-learning. To focus on popular projects, add a star threshold such as stars:>1000. A more targeted query would be license:apache-2.0 language:Go stars:>500 topic:kubernetes, which looks for Go repositories using the Apache 2.0 license, with more than 500 stars, and tagged with the Kubernetes topic.
Practical query combinations
- license:mit language:JavaScript stars:>1000 — popular JavaScript repositories using the MIT license.
- license:gpl-3.0 language:C stars:>100 topic:linux — C projects related to Linux that use GPLv3 and have meaningful community visibility.
- license:bsd-3-clause language:Rust pushed:>2024-01-01 — recently updated Rust projects using the BSD 3-Clause license.
- license:apache-2.0 topic:api stars:100..10000 — API-related Apache 2.0 projects within a mid-to-large popularity range.
- license:mpl-2.0 org:mozilla — repositories in the Mozilla organization using the Mozilla Public License 2.0.
Star filters are useful when you want to avoid abandoned examples, experiments, or personal forks. Use stars:>50 or stars:>100 for a modest quality signal, and stars:>1000 when you want highly visible projects. Ranges also work well: stars:10..200 can reveal smaller repositories that may be easier to study or contribute to than large, established projects.
Language filters help remove unrelated results when a topic spans many ecosystems. A query such as license:mit topic:web-framework may return repositories in JavaScript, Python, Ruby, Go, and more. Adding language:TypeScript turns it into license:mit topic:web-framework language:TypeScript, producing a cleaner list of TypeScript web framework projects. If a language has spaces or special naming, use the platform’s accepted language name, such as language:”Jupyter book” when supported by the search interface.
Using topics for intent-based filtering
Topics are especially helpful because they describe what a repository is about, not just what it is written in. For instance, license:apache-2.0 language:Java topic:security finds Java security projects under Apache 2.0, while license:mit language:Python topic:cli finds command-line tools in Python with MIT licensing. Since topics are maintained by repository owners and contributors, they can be inconsistent, so try related terms such as topic:machine-learning, topic:ml, topic:deep-learning, or topic:artificial-intelligence.
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You can also combine freshness filters with license, language, and topic filters to find active projects. For example, license:bsd-2-clause language:C++ topic:database pushed:>2024-06-01 searches for recently updated C++ database projects under the BSD 2-Clause license. This is useful when evaluating dependencies, because an active repository with a clear license is usually easier to assess than an old repository with little maintenance history.
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|---|---|
| Find popular permissive Python libraries | license:mit language:Python stars:>1000 |
| Find active Apache 2.0 cloud tools | license:apache-2.0 topic:cloud pushed:>2024-01-01 |
| Find GPLv3 Rust command-line apps | license:gpl-3.0 language:Rust topic:cli |
| Find smaller MIT web projects | license:mit topic:web stars:10..200 |
Finding Repositories with No Detected License
To find repositories where the platform has not detected a license, use the license:none qualifier in repository search. This filter returns repositories that do not have recognized license metadata, which usually means there is no standard license file in the expected location, the license text is incomplete, or the project uses custom wording that cannot be matched to a known license.
A basic search can be as simple as license:none. In practice, it is more useful to combine it with terms that narrow the result set. For example, license:none language:Python stars:>100 finds Python repositories with more than 100 stars and no detected license. If you are reviewing projects in a specific ecosystem, try queries such as license:none topic:machine-learning, license:none language:JavaScript pushed:>2024-01-01, or license:none org:example-org. These searches help identify active or popular repositories where licensing may need closer inspection before reuse, contribution, packaging, or internal adoption.
Useful search patterns
license:none stars:>50— finds repositories with some community interest but no detected license.license:none language:Go archived:false— limits results to active Go repositories.license:none topic:cli— searches command-line tool projects without detected license metadata.license:none user:username— checks repositories owned by a specific user.license:none org:company-name fork:false— reviews original repositories in an organization.
Repositories returned by license:none are not always truly unlicensed. Some projects place licensing terms in a README, NOTICE, COPYING, LEGAL, or documentation file instead of a standard LICENSE file. Others include a license file inside a subdirectory, use a non-English license notice, or combine mulle licenses across different parts of the repository. Since automated license detection generally works best with common license filenames and standard license text, any deviation can cause a repository to appear as having no detected license.
When you open a result, check the repository root for files named LICENSE, LICENSE.md, COPYING, COPYRIGHT, or NOTICE. Then search within the repository for words such as license, copyright, MIT, Apache, GPL, or BSD. Also inspect package metadata files such as package.json, pyproject.toml, setup.py, Cargo.toml, go.mod, and composer.json, because maintainers sometimes declare license information there even when no standalone license file exists.
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If a repository has no detected license and no clear license statement in its files, treat it as not explicitly licensed for reuse. Public visibility does not grant permission to copy, modify, redistribute, or use the code in another project. For compliance workflows, create a review queue from searches like license:none stars:>100 pushed:>2023-01-01, then manually classify each repository as no license found, license present but not detected, or custom license requires legal review.
Verifying License Information in Repository Files
Search results based on license metadata are a good starting point, but you should verify the actual license files before relying on a repository’s licensing status. A repository may appear under a license filter because the hosting platform detected a known license text, but that detection can miss custom clauses, mulle-license arrangements, generated files, or conflicting notices elsewhere in the project. For due diligence, open the repository and inspect the files that define licensing directly.
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Start with common license file names at the repository root. Look for LICENSE, LICENSE.md, LICENSE.txt, COPYING, COPYING.md, NOTICE, or UNLICENSE. Many repositories also include licensing details in README.md, CONTRIBUTING.md, package manifests, documentation folders, or source file headers. If the repository has a web interface license badge, click it and compare the detected license with the raw file content.
- Root license file: Confirms the main license text detected for the repository.
- README section: Often states practical licensing intent, such as “MIT licensed” or “dual licensed under Apache-2.0 and MIT.”
- NOTICE file: Common in Apache-2.0 projects and may list required attributions or bundled components.
- Package metadata: Files such as package.json, pyproject.toml, setup.py, Cargo.toml, composer.json, or gemspec may declare a license identifier.
- Source headers: Individual files may carry separate copyright and license statements.
When checking metadata, compare standardized identifiers with the repository text. For example, license:mit in search should generally correspond to MIT License wording in the license file and may also appear as “license”: “MIT” in a package manifest. For Apache-2.0 projects, look for the full Apache License text plus any NOTICE obligations. For GPL-family projects, confirm the exact version, such as GPL-2.0-only, GPL-2.0-or-later, GPL-3.0-only, or GPL-3.0-or-later, because version terms affect compatibility and reuse.
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Checks to perform before using a repository
- Open the detected license file and confirm it matches the license shown in search results.
- Check whether the license includes modifications, extra restrictions, or missing copyright lines.
- Search within the repository for terms such as license, copyright, SPDX, dual, commercial, and NOTICE.
- Review package manifests for license fields and compare them with the root license file.
- Inspect third-party directories, vendored dependencies, examples, assets, and generated code for separate licensing terms.
Be especially careful with repositories that contain mulle components. A project might license its source code under MIT while documentation is under Creative Commons, logos are “all rights reserved,” and included dependencies use BSD, Apache-2.0, or GPL terms. Monorepos can also contain separate packages with different license files in subdirectories. In those cases, the repository-level license metadata may describe only the dominant or top-level license, not every file you plan to reuse.
If license information is missing, inconsistent, or too vague, treat the repository as unverified rather than assuming it is available for your intended use. Check recent commits and issues for licensing discussions, look for release artifacts that may include additional notices, and contact the maintainers when necessary. For legal or compliance-sensitive use, rely on the license text in the repository files and your organization’s review process, not only on search filters or automatically detected metadata.
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License search is useful, but it depends on detected metadata rather than a full legal review of every file in a repository. A query such as license:mit or license:apache-2.0 usually matches repositories where the platform has identified a recognizable license file at the repository root. If the repository uses a custom license, places licensing terms in an unusual location, or includes mulle licensing notices, search results may not reflect the complete licensing situation.
Metadata can be missing or stale
A repository may have a valid license file but still not appear in license-filtered results. This often happens when the file is named unusually, stored outside the root directory, or written in a way that differs substantially from a standard SPDX-recognized license text. Recent changes can also take time to appear in search indexes. If a maintainer adds a LICENSE file today, the repository may not immediately show up for license:gpl-3.0 or similar queries.
- Check file names: common names include LICENSE, LICENSE.md, COPYING, and NOTICE.
- Check the default branch: license detection usually reflects the default branch, not every branch or tag.
- Check recent commits: indexing may lag behind repository updates.
- Check for generated mirrors: mirrors may omit license files or metadata from the upstream project.
Multiple licenses can be hard to interpret
Some projects are dual-licensed, use one license for source code and another for documentation, or include vendored dependencies with separate terms. Search filters may show the primary detected license, but that does not mean every file is covered by that license. For example, a repository may appear under license:bsd-3-clause while containing examples, assets, or third-party libraries under different terms. When compliance matters, inspect the root license file, package metadata, dependency manifests, and any NOTICE or THIRD_PARTY files.
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Query syntax and naming mistakes
Incorrect license identifiers are another common source of empty or misleading results. License qualifiers usually expect SPDX-style keys, not informal names. Use license:mpl-2.0 instead of license:mozilla, license:agpl-3.0 instead of license:affero, and license:unlicense rather than license:public-domain. If a query returns too few results, remove other filters temporarily and test the license qualifier by itself before adding language, topic, stars, or organization constraints.
| Problem | What to try |
|---|---|
| No results for a known license | Confirm the SPDX identifier and search with only the license qualifier first. |
| Repository has a license but is not listed | Inspect the license file name, location, default branch, and indexing freshness. |
| Detected license seems wrong | Compare the license file text with the declared package metadata and project documentation. |
| Too many unrelated results | Add filters such as language:go, stars:>100, topic:cli, or org:example. |
Search results should be treated as a discovery tool, not as a final licensing determination. For casual exploration, the license qualifier is usually enough to find projects under permissive, copyleft, or public-domain-style terms. For reuse in commercial products, redistribution, embedded systems, SaaS platforms, or open source audits, verify the repository files directly and review the exact license text that applies to the code you plan to use.
Frequently Asked Questions
How do I search GitHub for repositories with a specific license?
Use the license: qualifier in GitHub search, such as license:mit, license:apache-2.0, or license:gpl-3.0. You can enter it in the main search bar and then choose the “Repositories” result type. For best results, use the SPDX license identifier rather than the full license name.
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Can I combine a license search with language, stars, or topics?
Yes, license filters can be combined with other repository search qualifiers. For example, license:mit language:python stars:>100 topic:cli finds Python CLI projects under the MIT License with more than 100 stars. This is useful when you want reusable projects that match both legal and technical requirements.
How do I find repositories that do not have a detected license?
Use license:none in a repository search to find projects where GitHub has not detected a license. This does not always mean the code is unlicensed in a legal sense; it means GitHub’s license detection did not identify a supported license file. Always inspect the repository for files such as LICENSE, COPYING, README, or documentation that may mention licensing terms.
How can I verify that a repository’s detected license is correct?
Open the repository and check the license badge or license link near the file list, then compare it with the actual LICENSE or COPYING file. GitHub license detection usually works best when the file contains standard license text with minimal changes. If the license text has been modified, combined with another license, or placed only in a README, the detected metadata may be incomplete or inaccurate.
Why does a repository not appear in license search even though it has a license file?
The file may use a nonstandard name, contain customized license text, or include mulle licenses that GitHub cannot classify confidently. Search indexing can also lag behind recent repository changes, so a newly added license may not appear immediately. Check the repository files directly and try searching again later if the license was added recently.
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Searching repositories by license is most reliable when you combine license qualifiers with practical filters like language, topic, organization, stars, activity, or file contents. Start with a focused query such as license:mit language:python, then narrow the results based on your project goals.
Before reusing code, always verify the repository’s actual license file, package metadata, and any conflicting notices, since search results can be missing, outdated, or incorrectly detected. If the license is unclear, choose another repository or ask the maintainer for clarification before depending on it.
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