Developer Tools & Security
CertView: Offline X.509 Cryptographic Inspection Tooling for VS Code and JVM
Visual Studio Code extension and Kotlin toolkit for inspecting X.509 certificates, keystores, and truststores without exposing private data.
Availability
Official VS Code Marketplace
Security
0 bytes transmitted over network
Formats
PEM, DER, PFX, P12, CER, CRT
Compatibility
Windows, Linux, macOS
01 · The Engineering Challenge
The risk and friction of daily certificate inspection
Engineers building enterprise software constantly configure mTLS, electronic signatures, and JVM truststores. The lack of ergonomic local tools frequently pushes developers to paste private certificates into untrusted web decoders or memorize arcane OpenSSL commands when troubleshooting 'SSLHandshakeException'.
Key risks addressed:
- Leaking confidential corporate certificates or internal domain names to third-party decoder websites.
- Production downtime caused by unnoticed intermediate CA expirations or mismatched Subject Alternative Names (SANs).
- Wasted engineering hours diagnosing obscure cryptographic handshake failures in microservices.
02 · Architecture & System Design
Offline-First Cryptographic Inspection Architecture
CertView executes entirely inside the local editor process with zero network dependencies. The TypeScript decoding engine parses the certificate's ASN.1 structure, identifies OIDs and extensions, and renders an interactive TreeView with health indicators.
Core modules & responsibilities:
Native ASN.1 Parser
Decodes DER binaries and Base64 PEM blocks into a traversable object graph.
Cryptographic Health Engine
Flags deprecated hash algorithms (e.g. SHA-1) and calculates days remaining until expiration.
Trust Chain Visualizer
Reconstructs relationship hierarchy between leaf certificates, intermediates, and root CAs.
OpenSSL Command Generator
Generates precision CLI commands for format conversion and extraction in one click.
JVM / Kotlin Module
Runtime utilities for inspecting Java cacerts in microservice environments.
03 · Engineering Decisions & Trade-offs
Every technical choice prioritizes reducing operational risk and maintaining system clarity.
100% offline execution with zero outbound telemetry of file contents
Rationale: Non-negotiable security requirement when handling corporate PKI material. Guarantees no sensitive data leaves the engineer's workstation.
Explicit trade-off: Cannot perform real-time online CRL / OCSP revocation checks unless local CRLs are provided.
Native binary and PEM format parsing without requiring OpenSSL installed
Rationale: Works out-of-the-box across Windows, macOS, and Linux without external environment dependencies.
Explicit trade-off: Required implementing PKCS#12 and DER parsing natively in TypeScript.
Deep integration into the VS Code Command Palette and TreeView UX
Rationale: Minimizes cognitive friction: viewing certificate details feels as natural as opening code files.
Explicit trade-off: UI design is constrained by the styling rules and themes of the VS Code host application.
Developer Productivity and Security Impact
CertView eliminates everyday cryptographic headaches for software engineers, bridging the gap between developer ergonomics and security best practices.
Professional discussion
Does your engineering team deal with PKI, mTLS, or identity security?
Let’s review your certificate workflows, internal tooling, and mTLS architectures to prevent outages and security blind spots.