Format & Convert (JSON / YAML / CSV)

Convert between JSON, YAML, and CSV using the HeffTools converter API. Useful for transforming config files, exporting data, and wiring together tools that expect different formats.

Choose the input and output formats. JSON → CSV works best with an array of objects.
Backed by POST /api/v1/convert

What This Converter Does

This tool helps you switch between common text-based data formats used in APIs, configuration files, and export/import workflows. Instead of manually rewriting structures, you can paste your data, choose a direction, and let the HeffTools converter API produce the result.

Supported Conversions

  • JSON → YAML – useful for migrating API responses or config into YAML-based tools.
  • YAML → JSON – convert infrastructure or app configs into JSON for APIs or scripts.
  • JSON → CSV – turn arrays of objects into CSV for spreadsheets or reporting.

For JSON → CSV, the input should be an array of objects with consistent keys: [{"name": "Jeff", "role": "Dev"}, {"name": "Alex", "role": "Ops"}].

Tips for Valid Input

  • Ensure your JSON is valid and uses double quotes for keys and string values.
  • For YAML, maintain consistent indentation and avoid tab characters.
  • When converting JSON → CSV, use an array of flat objects (no deeply nested structures).
  • If conversion fails, check the error message and validate your input with a linter if needed.

Calling the Converter API from Your Code

This page sends the same request you can make from your own scripts: 

POST /api/v1/convert
Content-Type: application/json

{
  "direction": "json_to_yaml",
  "input": "{\n  \"name\": \"Jeff\",\n  \"role\": \"Dev\"\n}"
}

Example response:

{
  "direction":"json_to_yaml",
  "output":"name: Jeff\nrole: Dev\n"
}

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