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# JavaScript Stringify
[![NPM version][npm-image]][npm-url] [![NPM downloads][downloads-image]][downloads-url] [![Build status][build-image]][build-url] [![Build coverage][coverage-image]][coverage-url]
> Stringify is to `eval` as `JSON.stringify` is to `JSON.parse`.
## Installation
``` npm install javascript-stringify --save ```
## Usage
```javascript import { stringify } from "javascript-stringify"; ```
The API is similar `JSON.stringify`:
- `value` The value to convert to a string - `replacer` A function that alters the behavior of the stringification process - `space` A string or number that's used to insert white space into the output for readability purposes - `options` - **maxDepth** _(number, default: 100)_ The maximum depth of values to stringify - **maxValues** _(number, default: 100000)_ The maximum number of values to stringify - **references** _(boolean, default: false)_ Restore circular/repeated references in the object (uses IIFE) - **skipUndefinedProperties** _(boolean, default: false)_ Omits `undefined` properties instead of restoring as `undefined`
### Examples
```javascript stringify({}); // "{}" stringify(true); // "true" stringify("foo"); // "'foo'"
stringify({ x: 5, y: 6 }); // "{x:5,y:6}" stringify([1, 2, 3, "string"]); // "[1,2,3,'string']"
stringify({ a: { b: { c: 1 } } }, null, null, { maxDepth: 2 }); // "{a:{b:{}}}"
/** * Invalid key names are automatically stringified. */ stringify({ "some-key": 10 }); // "{'some-key':10}"
/** * Some object types and values can remain identical. */ stringify([/.+/gi, new Number(10), new Date()]); // "[/.+/gi,new Number(10),new Date(1406623295732)]"
/** * Unknown or circular references are removed. */ var obj = { x: 10 }; obj.circular = obj;
stringify(obj); // "{x:10}" stringify(obj, null, null, { references: true }); // "(function(){var x={x:10};x.circular=x;return x;}())"
/** * Specify indentation - just like `JSON.stringify`. */ stringify({ a: 2 }, null, " "); // "{\n a: 2\n}" stringify({ uno: 1, dos: 2 }, null, "\t"); // "{\n\tuno: 1,\n\tdos: 2\n}"
/** * Add custom replacer behaviour - like double quoted strings. */ stringify(["test", "string"], function (value, indent, stringify) { if (typeof value === "string") { return '"' + value.replace(/"/g, '\\"') + '"'; }
return stringify(value); }); //=> '["test","string"]' ```
## Formatting
You can use your own code formatter on the result of `javascript-stringify`. Here is an example using [eslint](https://www.npmjs.com/package/eslint):
```javascript const { CLIEngine } = require("eslint"); const { stringify } = require("javascript-stringify");
const { APP_ROOT_PATH, ESLINTRC_FILE_PATH } = require("./constants");
const ESLINT_CLI = new CLIEngine({ fix: true, cwd: APP_ROOT_PATH, configFile: ESLINTRC_FILE_PATH, });
module.exports = (objectToStringify) => { return ESLINT_CLI.executeOnText(stringify(objectToStringify)).results[0] .output; }; ```
## License
MIT
[npm-image]: https://img.shields.io/npm/v/javascript-stringify [npm-url]: https://npmjs.org/package/javascript-stringify [downloads-image]: https://img.shields.io/npm/dm/javascript-stringify [downloads-url]: https://npmjs.org/package/javascript-stringify [build-image]: https://img.shields.io/github/workflow/status/blakeembrey/javascript-stringify/CI/main [build-url]: https://github.com/blakeembrey/javascript-stringify/actions/workflows/ci.yml?query=branch%3Amain [coverage-image]: https://img.shields.io/codecov/c/gh/blakeembrey/javascript-stringify [coverage-url]: https://codecov.io/gh/blakeembrey/javascript-stringify
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