What input formats does this tool support?

It accepts logfmt key=value text and JSON, depending on the selected conversion direction.

Can quoted logfmt values contain spaces?

Yes. Quoted values with embedded spaces and escaped quotes are supported.

How are numbers and booleans converted?

When enabled, numeric and boolean strings are converted to typed JSON values during logfmt to JSON conversion.

How does the tool handle duplicate keys?

You can warn and use the last value, collect values into an array, or return a strict error.

Can null values be removed?

Yes. Enable Drop Null Values to omit null values from the converted output.

Elysia Tools

Navigation

Format Conversion

Logfmt to JSON Structured Log Bridge

Convert logfmt (key=value) to JSON or JSON back to logfmt, with quote escaping, number/boolean coercion, and duplicate-key handling.

Details

What this tool helps you do

logfmt (key=value pairs separated by spaces) is the native format of syslog-ng, Heroku log drains, Vector, Grafana Loki, and many Go logging libraries. This tool converts it to structured JSON for ingestion into ELK/Datadog/Splunk — and back. It handles quoted values with embedded spaces and escaped quotes, coerces numeric and boolean strings to typed JSON values, and lets you choose how duplicate keys are treated (warn-last-wins, collect into an array, or strict error).

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

Convert a Heroku-style logfmt log line to JSON

A single logfmt record with quoted message, numeric port, and boolean ready flag — coerced to typed JSON.

{
  "type": "text"
}

Convert a JSON log record back to logfmt

A structured JSON event with nested values serialized back into a single logfmt line.

{
  "type": "text"
}

Inputs

Set the required fields, then run the tool.

7 options

ContentPaste or type the main input values.1

InputtextareaRequired

SettingsAdjust formats, ranges, numbers, and modes.3

DirectionselectRequiredDuplicate-Key ModeselectOptionalIndent JSON (spaces)numberOptional

TogglesEnable or disable optional behavior.3

Coerce NumberscheckboxOptionalEnabled when checkedCoerce BooleanscheckboxOptionalEnabled when checkedDrop Null ValuescheckboxOptionalEnabled when checked

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Logfmt to JSON Structured Log Bridge

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert a server startup record to JSON

2. Convert JSON fields to logfmt

FAQ

Terraform Plan JSON Samples

Chat Transcript JSON Samples

JSON Samples

Rich Media JSON Samples

JSON Key Extractor

ECharts Theme Token Extractor

Image Palette to Design Tokens

Range Chart Generator

Semi-Structured Text Parsing and Table Extraction Tools

JSON Interchange and Format Translation Tools

JSON Inspection, Diff, and Transformation Tools

JSON Schema, Mock Data, and API Fixture Generators

3. Review duplicate fields in a log record