A self-written Java FIX protocol parser that decodes raw messages into both JSON and Avro. It fully resolves deeply nested structures such as repeating groups within repeating groups, producing accurate hierarchical output rather than a flat tag dump. Built for throughput — it sustains up to 50,000 messages per second on a single CPU with 2 GB of RAM. For Avro, the parser derives a minimal schema directly from the fields present in each message, keeping schemas lean and enabling schema evolution without maintaining a monolithic global definition. The parser is deployed as a Java AWS Lambda and exposed via API Gateway, handling parse requests on demand with no warm infrastructure.
Paste a raw FIX message below to decode it. Accepts pipe-delimited (|), \u0001 escaped,
or raw SOH formats.