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- # stringify-object [](http://travis-ci.org/yeoman/stringify-object)
- > Stringify an object/array like JSON.stringify just without all the double-quotes
- Useful for when you want to get the string representation of an object in a formatted way.
- It also handles circular references and lets you specify quote type.
- ## Install
- ```
- $ npm install stringify-object
- ```
- ## Usage
- ```js
- const stringifyObject = require('stringify-object');
- const obj = {
- foo: 'bar',
- 'arr': [1, 2, 3],
- nested: { hello: "world" }
- };
- const pretty = stringifyObject(obj, {
- indent: ' ',
- singleQuotes: false
- });
- console.log(pretty);
- /*
- {
- foo: "bar",
- arr: [
- 1,
- 2,
- 3
- ],
- nested: {
- hello: "world"
- }
- }
- */
- ```
- ## API
- ### stringifyObject(input, [options])
- Circular references will be replaced with `"[Circular]"`.
- #### input
- Type: `Object` `Array`
- #### options
- ##### indent
- Type: `string`<br>
- Default: `\t`
- Preferred indentation.
- ##### singleQuotes
- Type: `boolean`<br>
- Default: `true`
- Set to false to get double-quoted strings.
- ##### filter(obj, prop)
- Type: `Function`
- Expected to return a `boolean` of whether to include the property `prop` of the object `obj` in the output.
- ##### transform(obj, prop, originalResult)
- Type: `Function`<br>
- Default: `undefined`
- Expected to return a `string` that transforms the string that resulted from stringifying `obj[prop]`. This can be used to detect special types of objects that need to be stringified in a particular way. The `transform` function might return an alternate string in this case, otherwise returning the `originalResult`.
- Here's an example that uses the `transform` option to mask fields named "password":
- ```js
- const obj = {
- user: 'becky',
- password: 'secret'
- }
- const pretty = stringifyObject(obj, {
- transform: (obj, prop, originalResult) => {
- if (prop === 'password') {
- return originalResult.replace(/\w/g, '*');
- } else {
- return originalResult;
- }
- }
- });
- console.log(pretty);
- /*
- {
- user: 'becky',
- password: '******'
- }
- */
- ```
- ##### inlineCharacterLimit
- Type: `number`
- When set, will inline values up to `inlineCharacterLimit` length for the sake of more terse output.
- For example, given the example at the top of the README:
- ```js
- const obj = {
- foo: 'bar',
- 'arr': [1, 2, 3],
- nested: { hello: "world" }
- };
- const pretty = stringifyObject(obj, {
- indent: ' ',
- singleQuotes: false,
- inlineCharacterLimit: 12
- });
- console.log(pretty);
- /*
- {
- foo: "bar",
- arr: [1, 2, 3],
- nested: {
- hello: "world"
- }
- }
- */
- ```
- As you can see, `arr` was printed as a one-liner because its string was shorter than 12 characters.
- ## License
- BSD-2-Clause © Yeoman team
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