SAST for JavaScript and TypeScript
How SAST analyzes JavaScript and TypeScript across server, browser, and mobile code, and how teams should validate framework-aware findings.
Primary question: How should organizations apply SAST to JavaScript and TypeScript applications?
Direct answer
Analyze the complete JavaScript and TypeScript application across its execution boundaries
JavaScript and TypeScript SAST should analyze the controlled source revision with enough framework, configuration, and application-boundary context to follow supported security-relevant flows. [owasp-source-code-analysis][derscanner-frameworks]
Findings must be validated against the actual server, browser, or mobile execution context, framework behavior, trust boundaries, and deployed configuration before remediation priority is decided. [nist-ssdf]
Definitions
JavaScript and TypeScript SAST
Static application security testing applied to JavaScript or TypeScript source and supported code-level data flows without executing the application.
Execution boundary
A boundary between server, browser, mobile, worker, build-time, or external-service contexts with different trust and security assumptions.
Framework-aware analysis
Analysis that recognizes supported framework conventions, entry points, component behavior, and data handling.
The engineering problem
A single repository can mix server, browser, mobile, build, and infrastructure code whose security-sensitive operations differ by execution context.
Transpilation, generated bundles, aliases, dynamic imports, and framework conventions can obscure relationships when project context is unavailable. [owasp-source-code-analysis]
Framework support identifies recognized context but does not establish detection of every weakness or application-specific flow. [derscanner-frameworks]
Security controls
Each control inspects a different artifact and produces evidence for an engineering decision.
JavaScript and TypeScript source-code analysis
JavaScript and TypeScript Static Application Security Testing- Artifact
- JavaScript and TypeScript source, supported framework structure, configuration, and code-level data flows.
- Risk
- Security weaknesses in request handling, browser output, authorization, data access, command execution, and cross-boundary application logic.
- Output
- Findings with source locations, weakness classifications, and available flow context.
Evidence: DerScanner analysis modules and supported languagesDerScanner static analysis documentation
Execution-context validation
Security Finding Validation- Artifact
- SAST findings, framework behavior, runtime target, trust boundaries, and deployment configuration.
- Risk
- Applying an incorrect security interpretation across server, browser, or mobile contexts.
- Output
- Reviewed finding disposition and evidence-backed remediation decision.
Verification workflow
- Identify JavaScript and TypeScript repositories, workspaces, applications, packages, frameworks, runtime targets, and generated sources in scope.
- Select the controlled source revision and preserve analysis and build configuration.
- Run a JavaScript- and TypeScript-capable SAST analyzer against the complete intended scope.
- Review reported inputs, transformations, sensitive operations, and assumed execution boundaries.
- Validate material findings against framework behavior and deployed security requirements.
- Remediate confirmed weaknesses in the correct source package and execution context.
- Re-run SAST and complement it with runtime, dependency, and configuration testing.
DerScanner · Enterprise
Relationship to DerScanner
DerScanner documents JavaScript and TypeScript support in its Matcher analysis module.
DerScanner lists JavaScript and TypeScript in the Matcher module and among languages supported for static analysis. [derscanner-supported-languages][derscanner-sast]
DerScanner's JavaScript framework appendix lists Node.js, Express, React, React Native, Preact, and Vue; this documents recognized framework context, not complete detection coverage. [derscanner-frameworks]
DerScanner separately documents code-quality analysis for JavaScript and TypeScript; that capability should not be represented as security analysis. [derscanner-sast]
Limits of verification
- Language support does not imply complete coverage of every runtime, framework, library, bundler, or vulnerability pattern.
- Listed framework support does not guarantee that every application-specific flow or weakness will be detected.
- Dynamic imports, generated code, transpilation, and unavailable configuration can affect analysis.
- Browser, server, and mobile behavior require context-specific runtime verification.
- Findings can include false positives and false negatives.
Related knowledge
What Is SAST?
Parent definition of static application security testing
Relationship: related-toSAST Detection Coverage
Evaluating language, framework, and weakness coverage
Relationship: related-toCombining SAST and DAST
Combining source-level and runtime evidence for web applications
Relationship: related-toHow to Validate SAST Results
Validating findings across application contexts
Relationship: related-toCanonical terms used: JavaScript SAST; TypeScript SAST; Static Application Security Testing; framework-aware analysis; execution boundary.
Evidence and references
- NIST Secure Software Development FrameworkSecure development includes repeatable code review and analysis, remediation, and retention of evidence.
nist-ssdf - OWASP Source Code Analysis ToolsStatic source-code analysis examines code without executing the application and has context-dependent limitations.
owasp-source-code-analysis - DerScanner analysis modules and supported languagesDerScanner documents JavaScript and TypeScript support in its Matcher analysis module.
derscanner-supported-languages - DerScanner static analysis documentationDerScanner lists JavaScript and TypeScript for static analysis and separately lists code-quality analysis for both languages.
derscanner-sast - DerScanner frameworks and standard libraries supported by SASTDerScanner lists Node.js, Express, React, React Native, Preact, and Vue for JavaScript SAST context.
derscanner-frameworks
Analyze JavaScript and TypeScript