Write and validate schemas
Write or open an ASN.1 module and validate it. Errors and validation messages appear in the Console.
ASN.1 toolbox for macOS
ASN.1 tools for your Mac.
Write and validate ASN.1 schemas, edit values as JSON, encode or decode payloads, and inspect BER/DER.
- macOS 13+
- Intel and Apple silicon
- Project files stay local
Schema, values, bytes, and diagnostics in one window.
The video validates an ASN.1 schema, generates and edits schema-valid JSON values, encodes the payload, and inspects Structured output.
Workspace
Schema, values, encoding, and diagnostics.
The ASN.1 module, JSON values, encoded payload, and operation log remain visible in one window.
Edit values as JSON
Edit ASN.1 values as JSON and check them against the schema. Pro can generate a schema-valid starting value.
Encode, decode, and inspect
Encode JSON with a supported codec, or decode a payload back to editable JSON. Structured view shows BER/DER field details; Pro can edit supported fields.
Follow each operation
See validation, checking, encoding, decoding, and Structured view results in the operation log.
Included templates: ASN.1 Basics · X.509 Certificate · X.509 CRL · OCSP · LDAP · SNMPv2 · Kerberos · Time-Stamp Protocol
Codec support
Supported codecs.
Supported codecs, grouped by operation.
- Encode and decode
-
DERBEROERPERUPERXER
- Encode only
-
GSER
- Structured view
-
DERBER
Free & Pro
What Pro adds.
Pro adds schema-valid value generation and editing in Structured view. The other listed features are included in Free.
| Capability | Free | Pro One-time purchase |
|---|---|---|
| Validate schemas | Included | Included |
| Edit and check values as JSON | Included | Included |
| Encode and decode supported payloads | Included | Included |
| File workflows | Included | Included |
| BER/DER raw view and edit | Included | Included |
| BER/DER Structured view | View | View and edit supported fields |
| Generate schema-valid JSON values | — | Included |
Download
ASN1 for macOS.
Schemas, JSON values, encoded payloads, and diagnostics—all in one window.