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Convert a Human JSON config into clean YAML for tooling that prefers YAML or for editorial review.

By ChangeThisFile Team · Last updated: March 2026

Quick Answer

ChangeThisFile converts Human JSON (.hjson) configuration files to YAML on a secure server. Upload your .hjson file and we parse comments, unquoted keys, and multi-line strings, emitting equivalent canonical YAML. Files are auto-deleted after conversion. Free, no signup.

First daily conversion free No signup required Encrypted transfer · Async jobs kept up to 24h Queued when needed Updated May 2026

Human JSON vs YAML: Format Comparison

Key differences between the two formats

Feature	Human JSON	YAML
Syntax	JSON-with-comments and lenient parsing	Indentation-based, supports comments via #
Comments	Both // and /* */ supported	# style comments
Strings	Quoted, unquoted, or multi-line via triple quotes	Bare strings, quoted, or pipe (\|) / folded (>) for multi-line
Trailing commas	Allowed	Not used — YAML uses indentation instead
Tooling	Hjson parsers in many languages	Universal — YAML 1.2 parsers everywhere
Best for	Hand-edited config with comments	Pipelines and tools that prefer YAML

When to Convert

Common scenarios where this conversion is useful

Migrate from Hjson to YAML configs

If your project standardizes on YAML for configuration, convert existing Hjson files in one pass to switch over without losing any comments or values.

Feed Hjson into YAML-only tools

Some CI systems and config consumers expect YAML. Convert Hjson sources at build time so the original format stays human-friendly.

Generate YAML for documentation

If your app reads Hjson but your docs need YAML examples, convert once and embed the YAML directly in the documentation.

Standardize across a polyglot stack

Some services prefer Hjson, others YAML. Convert at the boundary so each consumer sees its preferred format without the source author having to maintain both.

Who Uses This Conversion

Tailored guidance for different workflows

Developers

Convert Human JSON config files to YAML for compatibility with different tools or frameworks
Transform Human JSON API responses to YAML for debugging, logging, or documentation

Validate the converted YAML output with a linter to catch any structural issues from the conversion

Watch for data type coercion (e.g., numbers becoming strings) when converting between Human JSON and YAML

Data Analysts

Convert Human JSON exports to YAML for importing into spreadsheet software, databases, or BI tools
Transform Human JSON datasets to YAML for sharing with teammates who use different analysis tools

Check that column delimiters and quote escaping are handled correctly in the converted YAML file

Preview the first few rows of the YAML output to verify headers and data alignment

System Administrators

Convert Human JSON configuration to YAML when migrating between infrastructure tools or platforms
Transform Human JSON log exports to YAML for ingesting into monitoring or analysis systems

Back up the original Human JSON config before converting, especially for production systems

Test the converted YAML in a staging environment before deploying to production

How to Convert Human JSON to YAML

1

Upload your Human JSON file

Drag and drop your Human JSON file onto the converter, or click browse. The file is uploaded over an encrypted connection.
2

Server-side conversion

The server converts your Human JSON to YAML on our secure backend. This typically takes a few seconds.
3

Download the YAML

Save your converted YAML file. The server copy is automatically deleted after processing.

Automate this conversion

Convert Human JSON to YAML via API

Integrate this conversion into your pipeline with 3 lines of code. Free tier: 25 conversions/month.

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@input.hjson" \
  -F "target=yaml" \
  -o output.yaml --fail

const form = new FormData();
form.append('file', fileInput.files[0]);
form.append('target', 'yaml');

const res = await fetch('https://changethisfile.com/v1/convert', {
  method: 'POST',
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' },
  body: form
});
const blob = await res.blob(); // your converted YAML file

Replace YOUR_API_KEY with your free key — no credit card needed.

Get a free API key

Frequently Asked Questions

Are comments preserved?

Comments are preserved when possible. // and /* */ from Hjson are converted to # style comments in the YAML output.

Are multi-line strings preserved?

Yes — Hjson triple-quoted multi-line strings are converted to YAML's pipe (|) or folded (>) scalar syntax automatically.

Will any tooling complain about the YAML output?

The output uses YAML 1.2 grammar, which is widely supported. Tooling stuck on YAML 1.1 may interpret some scalars (Norway problem, octal numbers) differently.

What if my Hjson has trailing commas?

Trailing commas are valid in Hjson but not used in YAML. They are silently removed during conversion since YAML uses indentation rather than separators.

Does this validate the config?

No — only Hjson grammar is checked during parsing. Application-specific validation (required fields, types) needs to happen in the consuming tool.

Can I convert YAML back to Hjson?

Yes — use ChangeThisFile's YAML to JSON converter and then JSON to Hjson is a trivial one-pass for which we offer a separate page.

Is my Hjson file uploaded?

Yes — conversion runs on our backend over HTTPS. The file is auto-deleted after processing.

What about quoted vs unquoted keys?

Hjson allows both quoted and unquoted keys. The YAML output uses unquoted keys when YAML grammar allows, otherwise quotes for safety.

What's the file size limit?

Up to 50MB, far larger than any realistic config file.

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