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// {p: {a: 1}, z: 1}\n```\n\nThe main difference between JSONPath / JSONSelect and this engine is that JSON Mask\n**preserves the structure of the original input object**.\nInstead of returning an array of selected sub-elements (e.g. `[{a: 1}, {z: 1}]` from example above),\nit filters-out the parts of the object that you don't need,\nkeeping the structure unchanged: `{p: {a: 1}, z: 1}`.\n\nThis is important because JSON Mask was designed with HTTP resources in mind,\nthe structure of which I didn't want to change after the unwanted fields\nwere masked / filtered.\n\nIf you've used the Google APIs, and provided a `?fields=` query-string to get a\n[Partial Response](https://developers.google.com/gdata/docs/2.0/reference#PartialResponse), you've\nalready used this language. The desire to have partial responses in\nmy own Node.js-based HTTP services was the reason I wrote JSON Mask.\n\n_For [express](http://expressjs.com/) users, there's an\n[express-partial-response](https://github.com/nemtsov/express-partial-response) middleware.\nIt will integrate with your existing services with no additional code\nif you're using `res.json()` or `res.jsonp()`. And if you're already using [koa](https://github.com/koajs/koa.git)\ncheck out the [koa-json-mask](https://github.com/nemtsov/koa-json-mask) middleware._\n\nThis library has no dependencies. It works in Node as well as in the browser.\n\n**Note:** the 1.5KB (gz), or 4KB (uncompressed) browser build is in the `/build` folder.\n\n## Syntax\n\nThe syntax is loosely based on XPath:\n\n- `a,b,c` comma-separated list will select multiple fields\n- `a/b/c` path will select a field from its parent\n- `a(b,c)` sub-selection will select many fields from a parent\n- `a/*/c` the star `*` wildcard will select all items in a field\n\nTake a look at `test/index-test.js` for examples of all of these and more.\n\n## Grammar\n\n```\n Props ::= Prop | Prop \",\" Props\n Prop ::= Object | Array\n Object ::= NAME | NAME \"/\" Prop\n Array ::= NAME \"(\" Props \")\"\n NAME ::= ? all visible characters except \"\\\" ? | EscapeSeq | Wildcard\n Wildcard ::= \"*\"\n EscapeSeq ::= \"\\\" ? all visible characters ?\n```\n\n## Examples\n\nIdentify the fields you want to keep:\n\n```js\nvar fields = 'url,object(content,attachments/url)';\n```\n\nFrom this sample object:\n\n```js\nvar originalObj = {\n id: 'z12gtjhq3qn2xxl2o224exwiqruvtda0i',\n url: 'https://plus.google.com/102817283354809142195/posts/F97fqZwJESL',\n object: {\n objectType: 'note',\n content:\n 'A picture... of a space ship... launched from earth 40 years ago.',\n attachments: [\n {\n objectType: 'image',\n url: 'http://apod.nasa.gov/apod/ap110908.html',\n image: { height: 284, width: 506 }\n }\n ]\n },\n provider: { title: 'Google+' }\n};\n```\n\nHere's what you'll get back:\n\n```js\nvar expectObj = {\n url: 'https://plus.google.com/102817283354809142195/posts/F97fqZwJESL',\n object: {\n content:\n 'A picture... of a space ship... launched from earth 40 years ago.',\n attachments: [\n {\n url: 'http://apod.nasa.gov/apod/ap110908.html'\n }\n ]\n }\n};\n```\n\nLet's test that:\n\n```js\nvar mask = require('json-mask');\nvar assert = require('assert');\n\nvar maskedObj = mask(originalObj, fields);\nassert.deepEqual(maskedObj, expectObj);\n```\n\n### Escaping\n\nIt is also possible to get keys that contain `,*()/` using `\\` (backslash) as escape character.\n\n```json\n{\n \"metadata\": {\n \"labels\": {\n \"app.kubernetes.io/name\": \"mysql\",\n \"location\": \"WH1\"\n }\n }\n}\n```\n\nYou can filter out the location property by `metadata(labels(app.kubernetes.io\\/name))` mask.\n\nNOTE: In [JavaScript String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#escape_sequences) you must escape backslash with another backslash:\n```js\nvar fields = 'metadata(labels(app.kubernetes.io\\\\/name))'\n```\n\n### Partial Responses Server Example\n\nHere's an example of using `json-mask` to implement the\n[Google API Partial Response](https://developers.google.com/gdata/docs/2.0/reference#PartialResponse)\n\n```js\nvar http = require('http');\nvar url = require('url');\nvar mask = require('json-mask');\nvar server;\n\nserver = http.createServer(function(req, res) {\n var fields = url.parse(req.url, true).query.fields;\n var data = {\n firstName: 'Mohandas',\n lastName: 'Gandhi',\n aliases: [\n {\n firstName: 'Mahatma',\n lastName: 'Gandhi'\n },\n {\n firstName: 'Bapu'\n }\n ]\n };\n res.writeHead(200, { 'Content-Type': 'application/json' });\n res.end(JSON.stringify(mask(data, fields)));\n});\n\nserver.listen(4000);\n```\n\nLet's test it:\n\n```bash\n$ curl 'http://localhost:4000'\n{\"firstName\":\"Mohandas\",\"lastName\":\"Gandhi\",\"aliases\":[{\"firstName\":\"Mahatma\",\"lastName\":\"Gandhi\"},{\"firstName\":\"Bapu\"}]}\n\n$ # Let's just get the first name\n$ curl 'http://localhost:4000?fields=lastName'\n{\"lastName\":\"Gandhi\"}\n\n$ # Now, let's just get the first names directly as well as from aliases\n$ curl 'http://localhost:4000?fields=firstName,aliases(firstName)'\n{\"firstName\":\"Mohandas\",\"aliases\":[{\"firstName\":\"Mahatma\"},{\"firstName\":\"Bapu\"}]}\n```\n\n**Note:** a few more examples are in the `/example` folder.\n\n## Command Line Interface - CLI\n\nWhen installed globally using `npm i -g json-mask` you can use it like:\n\n`json-mask \"\" [
![](\"https://raw.github.com/nemtsov/json-mask/master/logo.png\"){kind=logo}
\n\nThis is a tiny language and an engine for selecting specific parts of a JS object, hiding/masking the rest.\n\n```js\nvar mask = require('json-mask');\nmask({ p: { a: 1, b: 2 }, z: 1 }, 'p/a,z'); // {p: {a: 1}, z: 1}\n```\n\nThe main difference between JSONPath / JSONSelect and this engine is that JSON Mask\n**preserves the structure of the original input object**.\nInstead of returning an array of selected sub-elements (e.g. `[{a: 1}, {z: 1}]` from example above),\nit filters-out the parts of the object that you don't need,\nkeeping the structure unchanged: `{p: {a: 1}, z: 1}`.\n\nThis is important because JSON Mask was designed with HTTP resources in mind,\nthe structure of which I didn't want to change after the unwanted fields\nwere masked / filtered.\n\nIf you've used the Google APIs, and provided a `?fields=` query-string to get a\n[Partial Response](https://developers.google.com/gdata/docs/2.0/reference#PartialResponse), you've\nalready used this language. The desire to have partial responses in\nmy own Node.js-based HTTP services was the reason I wrote JSON Mask.\n\n_For [express](http://expressjs.com/) users, there's an\n[express-partial-response](https://github.com/nemtsov/express-partial-response) middleware.\nIt will integrate with your existing services with no additional code\nif you're using `res.json()` or `res.jsonp()`. And if you're already using [koa](https://github.com/koajs/koa.git)\ncheck out the [koa-json-mask](https://github.com/nemtsov/koa-json-mask) middleware._\n\nThis library has no dependencies. It works in Node as well as in the browser.\n\n**Note:** the 1.5KB (gz), or 4KB (uncompressed) browser build is in the `/build` folder.\n\n## Syntax\n\nThe syntax is loosely based on XPath:\n\n- `a,b,c` comma-separated list will select multiple fields\n- `a/b/c` path will select a field from its parent\n- `a(b,c)` sub-selection will select many fields from a parent\n- `a/*/c` the star `*` wildcard will select all items in a field\n\nTake a look at `test/index-test.js` for examples of all of these and more.\n\n## Grammar\n\n```\n Props ::= Prop | Prop \",\" Props\n Prop ::= Object | Array\n Object ::= NAME | NAME \"/\" Prop\n Array ::= NAME \"(\" Props \")\"\n NAME ::= ? all visible characters except \"\\\" ? | EscapeSeq | Wildcard\n Wildcard ::= \"*\"\n EscapeSeq ::= \"\\\" ? all visible characters ?\n```\n\n## Examples\n\nIdentify the fields you want to keep:\n\n```js\nvar fields = 'url,object(content,attachments/url)';\n```\n\nFrom this sample object:\n\n```js\nvar originalObj = {\n id: 'z12gtjhq3qn2xxl2o224exwiqruvtda0i',\n url: 'https://plus.google.com/102817283354809142195/posts/F97fqZwJESL',\n object: {\n objectType: 'note',\n content:\n 'A picture... of a space ship... launched from earth 40 years ago.',\n attachments: [\n {\n objectType: 'image',\n url: 'http://apod.nasa.gov/apod/ap110908.html',\n image: { height: 284, width: 506 }\n }\n ]\n },\n provider: { title: 'Google+' }\n};\n```\n\nHere's what you'll get back:\n\n```js\nvar expectObj = {\n url: 'https://plus.google.com/102817283354809142195/posts/F97fqZwJESL',\n object: {\n content:\n 'A picture... of a space ship... launched from earth 40 years ago.',\n attachments: [\n {\n url: 'http://apod.nasa.gov/apod/ap110908.html'\n }\n ]\n }\n};\n```\n\nLet's test that:\n\n```js\nvar mask = require('json-mask');\nvar assert = require('assert');\n\nvar maskedObj = mask(originalObj, fields);\nassert.deepEqual(maskedObj, expectObj);\n```\n\n### Escaping\n\nIt is also possible to get keys that contain `,*()/` using `\\` (backslash) as escape character.\n\n```json\n{\n \"metadata\": {\n \"labels\": {\n \"app.kubernetes.io/name\": \"mysql\",\n \"location\": \"WH1\"\n }\n }\n}\n```\n\nYou can filter out the location property by `metadata(labels(app.kubernetes.io\\/name))` mask.\n\nNOTE: In [JavaScript String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String#escape_sequences) you must escape backslash with another backslash:\n```js\nvar fields = 'metadata(labels(app.kubernetes.io\\\\/name))'\n```\n\n### Partial Responses Server Example\n\nHere's an example of using `json-mask` to implement the\n[Google API Partial Response](https://developers.google.com/gdata/docs/2.0/reference#PartialResponse)\n\n```js\nvar http = require('http');\nvar url = require('url');\nvar mask = require('json-mask');\nvar server;\n\nserver = http.createServer(function(req, res) {\n var fields = url.parse(req.url, true).query.fields;\n var data = {\n firstName: 'Mohandas',\n lastName: 'Gandhi',\n aliases: [\n {\n firstName: 'Mahatma',\n lastName: 'Gandhi'\n },\n {\n firstName: 'Bapu'\n }\n ]\n };\n res.writeHead(200, { 'Content-Type': 'application/json' });\n res.end(JSON.stringify(mask(data, fields)));\n});\n\nserver.listen(4000);\n```\n\nLet's test it:\n\n```bash\n$ curl 'http://localhost:4000'\n{\"firstName\":\"Mohandas\",\"lastName\":\"Gandhi\",\"aliases\":[{\"firstName\":\"Mahatma\",\"lastName\":\"Gandhi\"},{\"firstName\":\"Bapu\"}]}\n\n$ # Let's just get the first name\n$ curl 'http://localhost:4000?fields=lastName'\n{\"lastName\":\"Gandhi\"}\n\n$ # Now, let's just get the first names directly as well as from aliases\n$ curl 'http://localhost:4000?fields=firstName,aliases(firstName)'\n{\"firstName\":\"Mohandas\",\"aliases\":[{\"firstName\":\"Mahatma\"},{\"firstName\":\"Bapu\"}]}\n```\n\n**Note:** a few more examples are in the `/example` folder.\n\n## Command Line Interface - CLI\n\nWhen installed globally using `npm i -g json-mask` you can use it like:\n\n`json-mask \"