Resources

ASN.1 IO

Helpful, easy to use utilities for ASN.1, JSON, and NAS users:

Work with ASN.1 Schemas

ASN.1 Playground - Compile, encode, and decode.
ASN.1 Analyzer - Improve your ASN.1 schema.
ASN1Doc - Create an HTML document from your ASN.1 schema.
ASN.1 Python Compiler, Encoder, Decoder - Get the data bindings for your schema, encode, decode, and validate your data.
ASN.1/Rust Web Compiler (Beta) - Generate Rust bindings and encoders/decoders

Convert Other Formats to ASN.1

JSON/Schema2Asn - Generate an ASN.1 schema from a JSON message or a JSON schema.
Proto2ASN - Migrate Proto schemas into ASN.1 schemas.

Visual Studio Integration

ASN1Vsix - This ASN.1 extension for Microsoft Visual Studio, which is available for Visual Studio or Visual Studio Code, makes it faster and easier to create, modify, and validate your ASN.1 schemas.

Specialized Inspectors

NAS Playground
Decode your NAS messages.
PKI Inspector - Troubleshoot certificates, cryptographic keys, digitally signed messages, and other crypto data encoded in ASN.1 DER. You can inspect the data in two modes: in schema-less mode (when a schema is not available) or in schema-based mode (when a schema is available). In schema based mode, you can also inspect only a part of the data (for example, a payload).
CDR Inspector - Troubleshoot your Call Data Records (CDR). The tool detects BER format/TLV parsing errors and mismatch errors between the schema and the record.

If you are new to ASN.1 and want to find out more about it without going too deeply into technical details, you may want to check out our short ASN.1 overview with simple examples and explanations of the most common ASN.1 features.

ASN.1 Tools: Commercial vs. Open Source

Learn the key differences between commercial and open-source ASN.1 tools to make an informed decision for your project.

ASN.1 Workflow

Read about the workflow of developing with ASN.1, from defining your data and protocols in an ASN.1 specification, to developing and running an application that uses ASN.1.