How to Escape Tab Separators in Logstash?

Better Stack Team
Updated on April 5, 2024

To correctly process CSV data that uses tab characters as separators in Logstash, it's necessary to configure the Logstash CSV filter to recognize the tab separators.

Suppose you're reading CSV data as shown below:

input {
    file {
        path => "/var/data/*.csv"
        type => "test_data"
        start_position => "beginning"

In this case, indicate the tab separator with the real tab character:

filter {
   csv {
    separator => "  "  # <-- Real tab character used here

It's important to note that employing the \t sequence will not yield the expected results:

filter {
   csv {
    separator => "\t"  # <-- This does not parse as intended

To further your understanding of Logstash, explore our comprehensive guide.

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