JWE Tester

The JWE Tester provides a deterministic, developer-oriented approach to validating JSON Web Encryption payloads. It targets API security engineers, backend developers, and QA teams who must confirm confidentiality and integrity across encryption scenarios. The tool emphasizes correct header fields, encoding, and interoperability across algorithms and serializations. It delivers structured outputs suitable for automation and documentation.
Conceptually, the tool parses JWE data in compact or JSON form, validates header fields (alg, enc), verifies base64url encoding of all segments, and checks recipient structure. When keys or plaintext are provided, it can perform encryption or decryption using standard RFC 7516 flows, returning the computed ciphertext or recovered plaintext plus a detailed, machine-parseable trace of processing steps.
Audience and value: security teams, backend developers, and QA engineers seeking fast, auditable test coverage. It supports common algorithms (RSA-OAEP, A256KW, A128GCM, and related enc values), multiple serialization formats, and explicit error reporting. The tool also generates and validates test vectors, helping verify interoperability across libraries and cloud environments while reducing debugging time.
Core features include header validation, algorithm compatibility checks, key-wrapping and content-encryption flows, and clear error codes for malformed data. It detects missing or mismatched keys, invalid segments, and corrupted ciphertext, returning actionable diagnostics. Outputs are structured for automated pipelines and human review, enabling reproducible security testing, documentation of edge cases, and faster remediation.