Code Language Detector — Identify Any Programming Language

What does Code Language Detector do?

Code Language Detector identifies the programming language of any code snippet. Paste or input any code and get back the detected language with a confidence score — supporting 50+ popular programming languages.

This Actor runs on the Apify platform. Use it for code classification, dataset labeling, developer tools, or any workflow that needs to categorize code snippets programmatically.

Why use Code Language Detector?

• 50+ languages — Python, JavaScript, TypeScript, Go, Rust, Java, C++, Ruby, PHP, and more
• Confidence scores — know how certain the detection is
• Batch processing — classify hundreds of snippets in one run
• API-ready — integrate language detection into developer tools, IDEs, or code analysis pipelines
• No setup — no model downloads or infrastructure needed

How to use Code Language Detector

1. Open the Actor and click Try for free
2. Enter code snippets in the snippets input field
3. Click Start — detected languages appear in the Output tab
4. Download results as JSON or connect via the Apify API

Input

{
  "snippets": [
    { "id": "snippet1", "code": "def hello_world():\n    print('Hello, World!')" },
    { "id": "snippet2", "code": "const x = async () => await fetch('/api/data');" },
    { "id": "snippet3", "code": "fn main() { println!(\"Hello, Rust!\"); }" }
  ]
}

Field	Type	Description	Default
snippets	array	Code snippets to classify	required
snippets[].id	string	Optional identifier for each snippet	—
snippets[].code	string	The code snippet text	required

Output

Results are stored in the Apify dataset. Download in JSON, CSV, HTML, or Excel.

{
  "id": "snippet1",
  "detectedLanguage": "Python",
  "confidence": 0.97,
  "alternatives": [
    { "language": "Ruby", "confidence": 0.02 }
  ]
}

Output fields

Field	Type	Description
id	string	Snippet identifier (if provided)
detectedLanguage	string	Most likely programming language
confidence	number	Detection confidence score (0–1)
alternatives	array	Other possible languages with lower confidence

Cost

Pay-per-result pricing:

Volume	Estimated cost
100 snippets	~$0.01–$0.10
1,000 snippets	~$0.10–$1.00

Supported languages

Python, JavaScript, TypeScript, Java, C, C++, C#, Go, Rust, Ruby, PHP, Swift, Kotlin, R, Scala, Perl, Haskell, Lua, Shell, SQL, HTML, CSS, YAML, JSON, XML, Markdown, and more.

Tips

• Provide at least 3–5 lines of code for best accuracy — single-line snippets may have lower confidence
• Use the id field to correlate results with your source dataset
• For ambiguous snippets (e.g., plain text or config files), check the alternatives array

FAQ

What is the minimum snippet length for accurate detection? 3–5 lines of code is recommended. Very short snippets (1–2 lines) may have lower accuracy.

Can it detect domain-specific languages? The Actor focuses on popular general-purpose languages. DSLs may be misidentified.

Is this Actor maintained? Yes. Report bugs or feature requests in the Issues tab.

Need help or have questions? Open an issue in the Issues tab or reach out on Discord: maged03211