json-to-javascript

Convert JSON data to JavaScript code literals with smart handling of multiline strings.

This tool transforms JSON into properly formatted JavaScript code, automatically converting multiline strings into template literals with dedent support for clean indentation.

CLI Usage

$3

Input file (input.json):

``json
{
"greeting": "Hello\nWorld",
"message": "Line 1\nLine 2\nLine 3",
"count": 42
}
`

Node.js:

`bash
npx @jlarky/json-to-javascript \
--inputFile input.json \
--outputFile output.ts \
--useDedent true \
--prefix "import dedent from 'dedent'; export const data = (" \
--suffix ") as const" \
--prettierOptions '{"parser":"babel-ts"}'
`

Bun:

`bash
bunx @jlarky/json-to-javascript \
--inputFile input.json \
--outputFile output.ts \
--useDedent true \
--prefix "import dedent from 'dedent'; export const data = (" \
--suffix ") as const" \
--prettierOptions '{"parser":"babel-ts"}'
`

Deno:

`bash
deno run --allow-sys=cpus --allow-env --allow-read=. --allow-write=. \
jsr:@jlarky/json-to-javascript/cli \
--inputFile input.json \
--outputFile output.ts \
--useDedent true \
--prefix "import dedent from 'dedent'; export const data = (" \
--suffix ") as const" \
--prettierOptions '{"parser":"babel-ts"}'
`

Output file (output.ts):

`typescript
import dedent from "dedent";
export const data = {
greeting: dedent
Hello
World
,
message: dedent
Line 1
Line 2
Line 3
,
count: 42,
} as const;
`

$3

`bash
npx @jlarky/json-to-javascript \
--inputFile input.json \
--outputFile output.js
`

This outputs the same JSON with default prefix ( and suffix ):

`javascript
({
greeting: "Hello\nWorld",
message: "Line 1\nLine 2\nLine 3",
count: 42,
});
`

The difference from the previous example: no custom prefix/suffix, import statement, or dedent - just the data wrapped in parentheses with escaped newlines.

$3

`
json-to-javascript [options]

Required:
--inputFile Input JSON file
--outputFile Output JavaScript file

Optional:
--prefix Prefix for output (default: "(")
--suffix Suffix for output (default: ")")
--usePrettier Format with Prettier (default: true)
--prettierOptions Prettier options as JSON string
--useDedent Convert multiline strings to template literals
--dedentPrefix Prefix for dedent (default: " dedent")
--dedentSuffix Suffix for dedent (default: "")
--jsonStringifySpace Indentation spaces for JSON.stringify
--help Show help
`

Installation

If you want to use the library in your code or install it locally:

$3

`bash
deno add jsr:@jlarky/json-to-javascript
`

$3

`bash
bunx jsr add @jlarky/json-to-javascript # or bun add @jlarky/json-to-javascript
`

$3

`bash
npx jsr add @jlarky/json-to-javascript # or npm install @jlarky/json-to-javascript
`

Library Usage

`typescript
import { jsonToJavascript } from "@jlarky/json-to-javascript";

const data = { name: "John", age: 30 };
const result = await jsonToJavascript(data);
console.log(result.code); // ({ name: "John", age: 30 });
``

Use Cases

- Generate configuration files from JSON
- Create test fixtures from JSON data
- Convert API responses to TypeScript constants
- Generate code with proper template literal formatting for multiline content

Development

See CONTRIBUTING.md for development setup, testing, and publishing guidelines.

License

MIT