How to Use JSON with Logstash?

Better Stack Team
Updated on April 16, 2024

If you have JSON-formatted logs that you want to ingest and process with Logstash, follow these steps:

Assuming you have logs in the following JSON format:

{"status": 200, "ip": "", "level": 30, "msg": "Connected to database", "pid": 17089, "timestamp": 1696150204}
{"status": 200, "ip": "", "level": 30, "msg": "Task completed successfully", "pid": 17089, "timestamp": 1696150207}

You can read these JSON logs with the following Logstash configuration:

input {
  file {
    type => "json"
    path => "/var/log/mylogs.log"

filter {
  json {
    source => "message"

output {
  file {
    path => "/var/log/out.log"

This Logstash configuration reads JSON data from /var/log/mylogs.log, parses it using the JSON filter, and outputs the processed data to /var/log/out.log. Each incoming event (or log line) has the JSON message field parsed, and the resulting structured data is written to the output file.

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