Convert JSON to JSONC

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Converts to JSONC on secure servers · 1 free a day, files up to 25 MB · no signup

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Your file is uploaded over an encrypted connection and converted on our server. Add documentation comments to configuration files.

By ChangeThisFile Team · Last updated: October 2026

Quick Answer

Your file is uploaded over an encrypted connection and converted on our server. Drop your JSON file, add documentation comments, get JSONC back in seconds.

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

JSON vs JSONC: Format Comparison

Key differences between the two formats

Feature	JSON	JSONC
Comments	Not allowed	Single-line (//) and block (/* */)
Standards compliance	RFC 7159 strict	Extended JSON syntax
VS Code support	Basic highlighting	Full IntelliSense + comments
Configuration use	Limited documentation	Self-documenting configs
Maintainability	External docs needed	Inline documentation
File extension	.json	.jsonc or .json
Parser support	Universal	VS Code, TypeScript compiler, some tools

When to Convert

Common scenarios where this conversion is useful

VS Code settings documentation

Document complex VS Code settings.json and workspace configurations with explanatory comments for team members and future reference.

TypeScript configuration

Add comments to tsconfig.json explaining compiler options, path mappings, and build settings for better project documentation.

Package.json documentation

Document package.json scripts, dependencies, and configuration options with inline comments for easier project onboarding.

Application configuration

Transform configuration files into self-documenting formats with comments explaining environment variables, feature flags, and settings.

API schema documentation

Add explanatory comments to JSON schema files, API specifications, and data models for better developer experience.

Who Uses This Conversion

Tailored guidance for different workflows

Developers

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

Validate the converted JSONC 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 JSON and JSONC

Data Analysts

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

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

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

System Administrators

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

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

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

How to Convert JSON to JSONC

1

Drop your JSON file

Drag and drop your JSON file onto the converter, or click to browse and select your configuration file.
2

Add comments instantly

Your file is uploaded over an encrypted connection and converted on our server.
3

Download JSONC file

Click Download to save your JSONC file, ready for documentation comments and VS Code editing.

Automate this conversion

Convert JSON to JSONC 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.json" \
  -F "target=jsonc" \
  -o output.jsonc --fail

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

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 JSONC file

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

Get a free API key

Frequently Asked Questions

What is the difference between JSON and JSONC?

JSONC (JSON with Comments) extends standard JSON to support single-line (//) and block (/* */) comments, making configuration files self-documenting. Standard JSON doesn't allow comments.

Do all tools support JSONC format?

JSONC is supported by VS Code, TypeScript compiler, and many development tools. However, strict JSON parsers will reject JSONC files with comments. Check your tool's documentation.

Can I use JSONC for API responses?

No, JSONC should only be used for configuration files. API responses must use standard JSON without comments, as most HTTP clients and browsers don't support JSONC.

How do I add comments after conversion?

After converting to JSONC, open the file in VS Code or any text editor. Add // for single-line comments or /* */ for block comments anywhere in the file.

Will my JSON structure change during conversion?

No, the conversion preserves your exact JSON structure, formatting, and values. It only prepares the file to accept comments without changing existing content.

Can I convert large JSON configuration files?

Free conversions accept files up to 25MB. A one-time $2.99 Day Pass raises the limit to 100MB and unlocks unlimited conversions for 24 hours.

Should I use .json or .jsonc file extension?

Use .jsonc for files that contain comments to signal JSONC format. Some tools auto-detect JSONC in .json files, but .jsonc is clearer for documentation purposes.

Can I convert back from JSONC to JSON?

Yes, but you'll need to remove all comments first. JSONC with comments cannot be converted to standard JSON without stripping comment syntax.

Does VS Code automatically recognize JSONC files?

Yes, VS Code treats .jsonc files as JSON with Comments, providing syntax highlighting, error checking, and IntelliSense support for commented configuration files.

Are there performance differences between JSON and JSONC?

JSONC parsing is slightly slower due to comment processing, but the difference is negligible for configuration files. Use JSONC for development configs where documentation matters.

Can I use JSONC in Node.js applications?

Node.js doesn't natively support JSONC. You'll need libraries like 'jsonc-parser' or 'strip-json-comments' to read JSONC files in Node.js applications.

Is the JSON to JSONC conversion reversible?

The format conversion is reversible, but once you add comments to JSONC, removing them requires manual editing or tools that strip comments before converting back to standard JSON.

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