Convert Log Files: Parse Plain Text Logs Into JSON for Analysis
Convert application log files to structured JSON: parse timestamps, severity levels, and message fields with regex or grok patterns for querying.
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Tags: logs, json, devops
Convert Log Files: Parse Plain Text Logs Into JSON for Analysis Plain text logs are human-readable and terrible for querying. The moment you need to answer "what's the P95 response time for in the last hour filtered by 4xx status codes", you want structured JSON — not grep and awk chains. This guide covers converting Apache/Nginx logs, custom app logs, and system logs into NDJSON for analysis in ELK, Loki, or a simple Python script. Apache Combined Log Format Apache's default log format looks like this: The format string: Python parser --- Nginx Log Format Nginx's default format is identical to Apache's. But many setups use a custom JSON log format — which you should configure if you control the server: With JSON logging, no parsing is needed — each line is already valid JSON. For…
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