Overview

The log viewer can format structured (e.g. JSON) logs as plain text using a format string. The format string allows you to select which fields to include and how they should be formatted. You can configure the format string through the settings () dialog.

For example, for a JSON log with many fields:

{
  "ts": 1732733160216,
  "level": "ERROR",
  "message": "Failed to process payment.",
  "trace_id": "abc123def456",
  "span_id": "span_789xyz",
  "service": "payment-service",
  "environment": "production"
}

You might want to show only:

• timestamp

• level

• message

You can achieve this with the following format string {ts:timestamp} {level} {message}. {ts:timestamp} formats the timestamp field (Unix epoch) as an ISO 8601 date format while {level} and {message} display the specified fields as is.

The formatted log would appear as:

2024-11-27T18:46:00Z ERROR Failed to process payment.

For reference docs, see:

• Format string syntax

• Formatters