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CSON to JSON

Parse a CSON file into JSON in one click: indented blocks, block arrays, braces objects, comments and quoted strings handled automatically. All client-side.

CSON Input
Waiting for input
JSON Output
Blocks are defined by indentation. key: [ opens a block array, { opens a braced object element, and # starts a comment. Strings may be single- or double-quoted with standard escapes.

About CSON to JSON

CSON is the readable configuration format of the CoffeeScript ecosystem — but most tools, APIs and stores speak JSON. Reading a CSON file into code used to mean pulling in a parser dependency, or worse, hand-converting indentation into braces. Both are unnecessary when the conversion is one click away.

Convert CSON to JSON parses indented blocks, block arrays, brace-wrapped objects, comments and quoted strings into a clean JSON document. Comments are stripped, types are preserved, and the output is formatted for reading or reuse.

Features

  • Indentation-aware parser: Nested blocks, dedents and block arrays are reconstructed precisely.
  • Block and braced arrays: key: [ blocks and { } object elements are both supported.
  • Comment handling: # comment lines and inline comments are stripped automatically.
  • String decoding: Single and double quotes with \n, \t, \\ and \uXXXX escapes.
  • Typed values: true, false, null and numbers become native JSON values.
  • Defensive parsing: Malformed lines are reported instead of silently dropping data.
  • Pretty output: The result is formatted, readable JSON.
  • Private: All processing happens in your browser; nothing is uploaded.

How to Use

  1. Paste your CSON into the input pane.
  2. Review the live JSON — blocks, arrays and comments are handled automatically.
  3. Fix anything reported as a parse warning if the structure looks wrong.
  4. Copy or download the JSON document.

Examples

Example 1 — Legacy migration. A team moves a CoffeeScript service configuration into a JSON-backed config store, converting each .cson file and validating the output before deployment.

Example 2 — Toolchain cleanup. A developer replaces a CSON parser dependency with a one-off conversion into checked-in JSON, removing a build-time requirement.

Example 3 — Documentation. An architect converts a CSON sample into JSON for the API reference so both formats stay in sync from one source.

Example 4 — Round-trip editing. A developer hand-edits a friendly CSON file, converts it to JSON, and ships the JSON to a runtime that has no CSON support.

Benefits

  • Dependency-free: CSON becomes JSON without adding a parser library.
  • Faithful structure: Indentation and braces are mapped exactly onto JSON nesting.
  • Clean output: Comments are stripped and values are typed.
  • Zero data movement: The file is parsed locally and never uploaded.
  • Instant results: Live output updates with every keystroke.

Frequently Asked Questions

What CSON syntax is supported?
Indented key: value blocks, block arrays with key: [ and closing ], brace-wrapped objects inside arrays, single- and double-quoted strings with escapes, # comments, and true / false / null / numbers as values.
How does the parser handle indentation?
Indentation defines the structure: deeper indentation starts a nested block, the same indentation continues the current level, and dedentation closes it. Both spaces and tabs are accepted; the parser computes the indentation of each line.
Are comments stripped?
Yes. Lines whose first non-whitespace character is # are skipped, and inline # comments outside of strings are removed before parsing.
How are arrays of objects parsed?
Both styles are supported: brace-wrapped objects ({ name: "Ada" }) and bare object blocks (name: "Ada" followed by more indented keys). Multiple bare objects are separated correctly by indentation.
What about strings with quotes?
Single- and double-quoted strings are both decoded, including backslash escapes such as \n, \t, \\ and \uXXXX for Unicode. Unquoted words are treated as plain strings.
Is my CSON uploaded anywhere?
No. Parsing happens entirely in your browser. Nothing is uploaded, stored or logged.

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