Convert CFG to JSON Online Free
Parse legacy CFG and CONF configuration files into clean JSON for modern tooling, dashboards, and APIs.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts CFG configuration files to JSON on a secure server. Upload your .cfg or .conf file and we parse the key-value pairs and section headers into structured JSON. Files are auto-deleted after conversion. Free with no signup required.
Convert CFG to JSON
Drop your CFG file here to convert it instantly
Drag & drop your .cfg file here, or click to browse
Convert to JSON instantly
CFG vs JSON: Format Comparison
Key differences between the two formats
| Feature | CFG | JSON |
|---|---|---|
| Syntax | Key=value pairs grouped under [section] headers | Nested objects with bracket and brace notation |
| Comments | Supports # and ; comments inline | No native comment support |
| Nesting | Flat sections, no real nesting | Arbitrary nested objects and arrays |
| Tooling | Read by Linux daemons, Python configparser, Ansible | Universal — every language has a JSON parser |
| Type system | Untyped — every value is a string | Typed: strings, numbers, booleans, null, arrays, objects |
| Best for | Application config files and INI-style settings | API payloads, programmatic config, modern tooling |
When to Convert
Common scenarios where this conversion is useful
Migrate legacy app configs to a new stack
Convert .cfg files from Python/Linux apps into JSON when porting to Node, Go, or cloud-native services that expect JSON.
Feed CFG data into observability tools
Most logging and monitoring backends ingest JSON. Convert your daemon configs once so they can be diffed and indexed alongside everything else.
Validate config files in CI
Convert .cfg to JSON, then run JSON schema validation in your pipeline to catch typos and missing fields before deploy.
Power admin dashboards
Render the contents of a .cfg file inside a web UI by converting to JSON first — no need to write a custom parser in the frontend.
Who Uses This Conversion
Tailored guidance for different workflows
For DevOps Engineers
- Migrate legacy daemon configs (sshd, systemd, supervisor) into JSON for centralized config management
- Diff CFG files across environments by normalizing to JSON first
- Pipe CFG data into Terraform, Ansible, or other tools that prefer structured input
For Backend Developers
- Convert legacy Python configparser files when porting an app to a different language
- Expose .cfg contents through a REST API that returns JSON
- Power admin UIs that render config visually
How to Convert CFG to JSON
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1
Upload your CFG file
Drag and drop your CFG file onto the converter, or click browse. The file is uploaded over an encrypted connection.
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2
Server-side conversion
The server converts your CFG to JSON on our secure backend. This typically takes a few seconds.
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3
Download the JSON
Save your converted JSON file. The server copy is automatically deleted after processing.
Frequently Asked Questions
Standard INI-style CFG and CONF files with [section] headers and key=value pairs, including comments. This covers configs used by most Linux daemons, Python configparser, and many desktop applications.
Yes. Each [section] from the CFG becomes a top-level object key in the JSON, and the keys inside each section become its properties.
No. JSON has no native comment syntax, so #/; comments from the CFG are stripped during conversion. The values themselves are preserved exactly.
Duplicate keys within the same section are not allowed in JSON objects, so the last occurrence wins. We recommend cleaning up duplicates in the source file before converting.
All CFG values arrive as strings. We keep them as strings in the output to preserve fidelity — coerce them to numbers or booleans in your downstream code if needed.
The free converter accepts files up to 50MB, which is far larger than any realistic config file.
Yes — CFG parsing runs on our backend. The file is auto-deleted after conversion and is transferred over encrypted HTTPS.
Yes, use ChangeThisFile's JSON to INI converter — INI and CFG share the same flat-section structure.
Yes, indentation-continued multi-line values (per the configparser spec) are concatenated and stored as a single string in the JSON output.
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Need to convert programmatically?
Use the ChangeThisFile API to convert CFG to JSON in your app. No rate limits, up to 500MB files, simple REST endpoint.
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