XSLT equivalent for JSON

Question

Is there an XSLT equivalent for JSON  Something to allow me to do transformations on JSON like XSLT does to XML

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it is very possible to convert JSON using XSLT  you need JSON2SAX deserializer and SAX2JSON serializer   Sample code in Java  http   www gerixsoft com blog json xslt4json

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One approach not yet given is to use a parser generator to create a parser in XSLT which parses JSON and produces an XML output   One option that gets mentioned a lot at the XML conferences is the ReX parser generator  http   www bottlecaps de rex   - although totally undocumented on the site  recipes are available on searching

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JSLT is very close to a JSON equivalent of XSLT  It s a transform language where you write the fixed part of the output in JSON syntax  then insert expressions to compute the values you want to insert in the template   An example        time   round parse-time  published   yyyy-MM-dd T HH mm ssX     1000      device manufacturer    device manufacturer     device model    device model     language    device acceptLanguage     It s implemented in Java on top of Jackson

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I recently found a tool that I love for styling JSON  https   github com twigkit tempo   Very easy tool to use--in my opinion  it is much easier to work with than XSLT--no need for XPATH queries

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I am using Camel route umarshal xmljson  -  to xlst  -  marshal xmljson   Efficient enough  though not 100  perfect   but simple  if you are already using Camel

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To say lack of tools suggest lack of need is just begging the question  The same could be applied to support for X or Y in Linux  Why bother developing quality drivers and or games  for such a minority OS  And why pay attention to an OS that big game and hardware companies don t develop for    Probably the people who would need to use XSLT and JSON end up using a somewhat trivial workaround  Transforming JSON into XML  But that s not the optimal solution  is it   When you have a native JSON format and you want to edit it  wysywyg  in the browser  XSLT would be a more than adequate solution for the problem  Doing that with traditional javascript programming can become a pain in the arse   In fact  I have implemented a  stone-age  approach to XSLT  using substring parsing to interpret some basic commands for javascript  like calling a template  process children  etc  Certainly implementing a transformation engine with a JSON object is much easier than implementing a full-fledged XML parser to parse the XSLT  Problem is  that to use XML templates to transform a JSON object you need to parse the XML of the templates   To tranform a JSON object with XML  or HTML  or text or whatever  you need to think carefully about the syntax and what special characters you need to use to identify the transformation commands  Otherwise you ll end up having to design a parser for your own custom templating language  Having walked through that path  I can tell you that it s not pretty   Update  Nov 12  2010   After a couple of weeks working on my parser  I ve been able to optimize it  Templates are parsed beforehand and commands are stored as JSON objects  Transformation rules are also JSON objects  while the template code is a mix of HTML and a homebrew syntax similar to shell code  I ve been able to transform a complex JSON document into HTML to make a document editor  The code is around 1K lines for the editor  it s for a private project so I can t share it  and around 990 lines for the JSON transformation code  includes iteration commands  simple comparisons  template calling  variable saving and evaluation   I plan to release it under a MIT license  Drop me a mail if you want to get involved

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For a working doodle proof of concept of an approach to utilize pure JavaScript along with the familiar and declarative pattern behind XSLT s matching expressions and recursive templates  see https   gist github com brettz9 0e661b3093764f496e36   A similar approach might be taken for JSON    Note that the demo also relies on JavaScript 1 8 expression closures for convenience in expressing templates in Firefox  at least until the ES6 short form for methods may be implemented    Disclaimer  This is my own code

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As yet another new answer to an old question  I d suggest a look at DefiantJS   It s not an XSLT equivalent for JSON  it is XSLT for JSON   The  Templating  section of the documentation includes this example    lt  -- Defiant template -- gt   lt script type  defiant xsl-template  gt       lt xsl template name  books template  gt           lt xsl for-each select    movie  gt               lt xsl value-of select  title   gt  lt br  gt           lt  xsl for-each gt       lt  xsl template gt   lt  script gt    lt script type  text javascript  gt   var data              movie                   title    The Usual Suspects                  title    Pulp Fiction                  title    Independence Day                        htm   Defiant render  books template   data    console log htm      The Usual Suspects lt br gt     Pulp Fiction lt br gt     Independence Day lt br gt

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I ve been really tired of the enormous amount of JavaScript templating engines out there  and all their inline HTML-templates  different markup styles  etc   and decided to build a small library that enables XSLT formatting for JSON data structures  Not rocket science in any way -- it s just JSON parsed to XML and then formatted with a XSLT document  It s fast too  not as fast as JavaScript template engines in Chrome  but in most other browsers it s at least as fast as the JS engine alternative for larger data structures

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XSLT supports JSON as seen at http   www w3 org TR xslt-30  json  XML uses angular brackets for delimiter tokens  JSON uses braces  square brackets      I  e  XML s fewer token recognition comparisons means it s optimized for declarative transformation  whereas more comparisons  being like switch statement  for speed reasons assume speculative branch prediction that imperative code in scripting languages is useful for  As direct consequence  for different mixes of semi-structured data  you may want to benchmark XSLT and javascript engines  performance as part of responsive pages  For negligible data payload  transformations might work just as well with JSON without XML serialization  W3 s decision ought to be based on better analysis

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There is now  I recently created a library  json-transforms  exactly for this purpose   https   github com ColinEberhardt json-transforms  It uses a combination of JSPath  a DSL modelled on XPath  and a recursive pattern matching approach  inspired directly by XSLT   Here s a quick example  Given the following JSON object   const json        automobiles            maker    Nissan    model    Teana    year   2011           maker    Honda    model    Jazz    year   2010           maker    Honda    model    Civic    year   2007           maker    Toyota    model    Yaris    year   2008           maker    Honda    model    Accord    year   2011            Here s a transformation   const jsont   require  json-transforms    const rules       jsont pathRule        automobiles  maker      Honda     d   gt           Honda  d runner                 jsont pathRule          maker    d   gt           model  d match model        year  d match year               jsont identity     const transformed    jsont transform json  rules     Which output the following        Honda            model    Jazz    year   2010           model    Civic    year   2007           model    Accord    year   2011           This transform is composed of three rules  The first matches any automobile which is made by Honda  emitting an object with a Honda property  then recursively matching  The second rule matches any object with a maker property  outputting the model and year properties  The final is the identity transform that recursively matches

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XSLT equivalents for JSON - a list of candidates  tools and specs  Tools 1  XSLT You can use XSLT for JSON with the aim of fn json-to-xml   This section describes facilities allowing JSON data to be processed using XSLT   2  jq  jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed  awk  grep and friends let you play with text  There are install packages for different OS   3  jj  JJ is a command line utility that provides a fast and simple way to retrieve or update values from JSON documents  It s powered by GJSON and SJSON under the hood   4  fx  Command-line JSON processing tool - Don t need to learn new syntax - Plain JavaScript - Formatting and highlighting - Standalone binary  5  jl  jl   quot JSON lambda quot   is a tiny functional language for querying and manipulating JSON   6  JOLT  JSON to JSON transformation library written in Java where the  quot specification quot  for the transform is itself a JSON document   7  gron  Make JSON greppable  gron transforms JSON into discrete assignments to make it easier to grep for what you want and see the absolute  path  to it  It eases the exploration of APIs that return large blobs of JSON but have terrible documentation   8  json-e  JSON-e is a data-structure parameterization system for embedding context in JSON objects  The central idea is to treat a data structure as a  quot template quot  and transform it  using another data structure as context  to produce an output data structure   9  JSLT  JSLT is a complete query and transformation language for JSON  The language design is inspired by jq  XPath  and XQuery   10  JSONata  JSONata is a lightweight query and transformation language for JSON data  Inspired by the  location path  semantics of XPath 3 1  it allows sophisticated queries to be expressed in a compact and intuitive notation   11  JSONPath Plus  Analyse  transform  and selectively extract data from JSON documents  and JavaScript objects   jsonpath-plus expands on the original specification to add some additional operators and makes explicit some behaviors the original did not spell out   12  json-transforms Last Commit Dec 1  2017  Provides a recursive  pattern-matching approach to transforming JSON data  Transformations are defined as a set of rules which match the structure of a JSON object  When a match occurs  the rule emits the transformed data  optionally recursing to transform child objects   13  json Last commit Jun 23  2018  json is a fast CLI tool for working with JSON  It is a single-file node js script with no external deps  other than node js itself    14  jsawk Last commit Mar 4  2015  Jsawk is like awk  but for JSON  You work with an array of JSON objects read from stdin  filter them using JavaScript to produce a results array that is printed to stdout   15  yate Last Commit Mar 13  2017  Tests can be used as docu https   github com pasaran yate tree master tests  16  jsonpath-object-transform Last Commit Jan 18  2017  Pulls data from an object literal using JSONPath and generate a new objects based on a template   17  Stapling Last Commit Sep 16  2013  Stapling is a JavaScript library that enables XSLT formatting for JSON objects  Instead of using a JavaScript templating engine and text html templates  Stapling gives you the opportunity to use XSLT templates - loaded asynchronously with Ajax and then cached client side - to parse your JSON datasources   Specs   JsonPointer   JSON Pointer defines a string syntax for identifying a specific value within a JavaScript Object Notation  JSON  document    JsonPath   JSONPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document   JSPath   JSPath for JSON is like XPath for XML  quot    JSONiq   The main source of inspiration behind JSONiq is XQuery  which has been proven so far a successful and productive query language for semi-structured data

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I wrote a dom adapter for my jackson based json processing framework long time ago  It uses the nu xom library  The resulting dom tree works with the java xpath and xslt facilities  I made some implementation choices that are pretty straightforward  For example the root node is always called  root   arrays go into an ol node with li sub elements  like in html   and everything else is just a sub node with a primitive value or another object node   JsonXmlConverter java  Usage   JsonObject sampleJson   sampleJson            org w3c dom Document domNode   JsonXmlConverter getW3cDocument sampleJson   root

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Have a look at jsonpath-object-transform

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I wrote my own small library around this  recently  which tries to stay as close to  5 1 Processing Model  XSLT REC  https   www w3 org TR xslt section-Processing-Model  as is possible  as I could anyway   in a few lines of JavaScript code   Here are a few not-completely-trivial examples of use     1  JSON-to-some-markup   Fiddle  https   jsfiddle net YSharpLanguage kj9pk8oz 10   inspired by D 1 Document Example  XSLT REC  https   www w3 org TR xslt section-Document-Example   where this   var D1document         type   document   title     Document Title                       type   chapter   title     Chapter Title                             type   section   title     Section Title                                   type   para          This is a test                      type   note          This is a note                              type   section   title     Another Section Title                                   type   para          This is      emph   another       test                      type   note          This is another note                                       var D1toHTML                function node    return node type      document            function root          return   lt html gt  r n     lt head gt  r n       lt title gt  r n         title  r n  of root            lt  title gt  r n     lt  head gt  r n     lt body gt  r n       of root     through this           lt  body gt  r n   lt  html gt                     function node    return node type      chapter            function chapter          return       lt h2 gt  title  lt  h2 gt  r n  of chapter          of chapter     through this                     function node    return node type      section            function section          return       lt h3 gt  title  lt  h3 gt  r n  of section          of section     through this                     function node    return node type      para            function para          return       lt p gt     lt  p gt  r n  of para     through this                     function node    return node type      note            function note          return       lt p class  note  gt  lt b gt NOTE   lt  b gt     lt  p gt  r n  of note     through this                     function node    return node emph           function emph          return   lt em gt  emph  lt  em gt   of emph                   console log D1document through D1toHTML          gives    lt html gt     lt head gt       lt title gt        Document Title      lt  title gt     lt  head gt     lt body gt       lt h2 gt Chapter Title lt  h2 gt       lt h3 gt Section Title lt  h3 gt       lt p gt This is a test  lt  p gt       lt p class  note  gt  lt b gt NOTE   lt  b gt This is a note  lt  p gt       lt h3 gt Another Section Title lt  h3 gt       lt p gt This is  lt em gt another lt  em gt  test  lt  p gt       lt p class  note  gt  lt b gt NOTE   lt  b gt This is another note  lt  p gt     lt  body gt   lt  html gt    and  2  JSON-to-JSON   Fiddle  https   jsfiddle net YSharpLanguage ppfmmu15 10  where this       A  Company  is just an object with a  Team   function Company obj      return obj team  amp  amp  Team obj team          A  Team  is just a non-empty array that contains at least one  Member   function Team obj      return      toString call obj        object Array     amp  amp           obj length  amp  amp           obj find function item    return Member item              A  Member  must have first and last names  and a gender  function Member obj      return obj first  amp  amp  obj last  amp  amp  obj sex     function Dude obj      return Member obj   amp  amp   obj sex      Male       function Girl obj      return Member obj   amp  amp   obj sex      Female       var data     team        first   John   last   Smith   sex   Male         first   Vaio   last   Sony         first   Anna   last   Smith   sex   Female         first   Peter   last   Olsen   sex   Male          var TO SOMETHING ELSE                 Company        function company          return   some virtual dom            the dudes    ul  company team select Dude  through this             the grrls    ul  company team select Girl  through this                              Member        function member          return   li    first   last    sex    of member                    console log JSON stringify data through TO SOMETHING ELSE   null  4          gives          some virtual dom              the dudes                  ul                                            li    John Smith  Male                                                             li    Peter Olsen  Male                                                       the grrls                  ul                                            li    Anna Smith  Female                                                       3  XSLT vs  JavaScript   A JavaScript equivalent of     XSLT 3 0 REC Section 14 4 Example  Grouping Nodes based on Common Values   at  http   jsfiddle net YSharpLanguage 8bqcd0ey 1   Cf  https   www w3 org TR xslt-30  grouping-examples  where     var cities         name   Milano    country   Italia        pop  5        name   Paris     country   France        pop  7        name   M  nchen   country   Deutschland   pop  4        name   Lyon      country   France        pop  2        name   Venezia   country   Italia        pop  1            Cf    XSLT 3 0 REC Section 14 4   Example  Grouping Nodes based on Common Values    https   www w3 org TR xslt-30  grouping-examples    var output     lt table gt  r n     lt tr gt  r n       lt th gt Position lt  th gt  r n       lt th gt Country lt  th gt  r n       lt th gt City List lt  th gt  r n       lt th gt Population lt  th gt  r n     lt  tr gt     r n   lt  table gt   of         cities select   groupBy  country   function byCountry  index          var country   byCountry 0             cities   byCountry 1  select   orderBy  name          return   r n     lt tr gt  r n       lt td gt  position  lt  td gt  r n       lt td gt  country  lt  td gt  r n       lt td gt  cities  lt  td gt  r n       lt td gt  population  lt  td gt  r n     lt  tr gt            of   position  index   1  country  country               cities  cities map function city    return city name     join                     population  cities reduce function sum  city    return sum    city pop     0                                   gives    lt table gt     lt tr gt       lt th gt Position lt  th gt       lt th gt Country lt  th gt       lt th gt City List lt  th gt       lt th gt Population lt  th gt     lt  tr gt     lt tr gt       lt td gt 1 lt  td gt       lt td gt Italia lt  td gt       lt td gt Milano  Venezia lt  td gt       lt td gt 6 lt  td gt     lt  tr gt     lt tr gt       lt td gt 2 lt  td gt       lt td gt France lt  td gt       lt td gt Lyon  Paris lt  td gt       lt td gt 9 lt  td gt     lt  tr gt     lt tr gt       lt td gt 3 lt  td gt       lt td gt Deutschland lt  td gt       lt td gt M  nchen lt  td gt       lt td gt 4 lt  td gt     lt  tr gt   lt  table gt    4  JSONiq vs  JavaScript   A JavaScript equivalent of     JSONiq Use Cases Section 1 1 2  Grouping Queries for JSON   at  https   jsfiddle net YSharpLanguage hvo24hmk 3   Cf  http   jsoniq org docs JSONiq-usecases html-single index html jsongrouping  where          1 1 2  Grouping Queries for JSON   http   jsoniq org docs JSONiq-usecases html-single index html jsongrouping    var sales          product     broiler    store number    1   quantity    20          product     toaster    store number    2   quantity    100         product     toaster    store number    2   quantity    50         product     toaster    store number    3   quantity    50         product     blender    store number    3   quantity    100         product     blender    store number    3   quantity    150         product     socks    store number    1   quantity    500         product     socks    store number    2   quantity    10         product     shirt    store number    3   quantity    10       var products          name     broiler    category     kitchen    price    100   cost    70         name     toaster    category     kitchen    price    30   cost    10         name     blender    category     kitchen    price    50   cost    25          name     socks    category     clothes    price    5   cost    2         name     shirt    category     clothes    price    10   cost    3       var stores          store number    1   state     CA          store number    2   state     CA          store number    3   state     MA          store number    4   state     MA        var nestedGroupingAndAggregate   stores select   orderBy  state   groupBy  state     function byState        var state   byState 0           stateStores   byState 1       byState            return                   byState state            products select   orderBy  category   groupBy  category             function byCategory                var category   byCategory 0                   categoryProducts   byCategory 1                   categorySales   sales filter function sale                      return stateStores find function store    return sale  store number       store  store number        amp  amp                           categoryProducts find function product    return sale product     product name                                      byCategory                    return                                   byCategory category                    categorySales select   orderBy  product   groupBy  product                     function byProduct                        var soldProduct   byProduct 0                           soldQuantities   byProduct 1                       byProduct                            return                                                   byProduct soldProduct                            soldQuantities reduce function sum  sale    return sum    sale quantity     0                                                 byProduct                                               byProduct                                  byCategory                               byCategory                  byState                byState         gives              CA                      clothes                              socks   510                                                 kitchen                              broiler   20                                       toaster   150                                                   MA                      clothes                              shirt   10                                                 kitchen                              blender   250                                       toaster   50                                             It is also useful to overcome the limitations of JSONPath wrt  querying against the ancestor axis  as raised by this SO question  and certainly others    E g   how to get the discount of a grocery item knowing its brand id  in      prods                    info                    rate   85                             grocery                                           brand    C                      brand id    984                                                            brand    D                      brand id    254                                                   discount    15                        info                    rate   100                             grocery                                           brand    A                      brand id    983                                                            brand    B                      brand id    253                                                   discount    20                   A possible solution is   var products           prods                            info                        rate   85                                     grocery                                                   brand    C                          brand id    984                                                                        brand    D                          brand id    254                                                               discount    15                                    info                        rate   100                                     grocery                                                   brand    A                          brand id    983                                                                        brand    B                          brand id    253                                                               discount    20                        function GroceryItem obj      return  typeof obj brand      string    amp  amp   typeof obj brand id      string              last parameter set to  true   to grab all the  GroceryItem  instances        at any depth  var itemsAndDiscounts     products   nodeset GroceryItem  true       map        function node            var item   node value     node value  the current  GroceryItem   aka    prods    grocery                   discount   node parent     node parent  the array of  GroceryItem   aka    prods    grocery                          parent     node parent parent  the product  aka    prods                             discount     node parent parent discount  the product discount             finally  project into an easy-to-filter form          return   id  item brand id  discount  discount                       discountOfItem983   discountOfItem983   itemsAndDiscounts    filter         function mapped          return mapped id      983                0  discount   console log  Discount of  983      discountOfItem983         which gives   Discount of  983  20    HTH

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Yate  https   github com pasaran yate  is specifically designed after XSLT  features JPath  a  natural XPath equivalent for JS   compiles to JavaScript and has quite a  history of production use  It   s practically undocumented  but reading through samples and tests should be enough

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JSONiq is such a standard and Zorba an open-source C   implementation  JSONiq can also be seen as XQuery with adding JSON as a native data type

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Interesting idea  Some searching on Google produced a few pages of interest  including    an outline of how such a  jsonT  tool might be implemented  and some downloads some discussion of that implementation a company which may have implemented something suitable   Hope this helps

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It may be possible to use XSLT with JSON  Verson 3 of XPath 3 1  XSLT 3 0  and XQuery 3 1  supports JSON in some way  This seems to be available in the commercial version of Saxon  and might at some point be included in the HE version  https   www saxonica com html documentation functions fn parse-json html  -  What I would expect from an alternative solution   I would want to be able input JSON to fetch a matching set of data  and output JSON or TEXT   Access arbitrary properties and evaluate the values  Support for conditional logic  I would want the transformation scripts to be external from the tool  text based  and preferably a commonly used language   Potential alternative   I wonder if SQL could be a suitable alternative  https   docs microsoft com en-us sql relational-databases json json-data-sql-server  It would be nice if the alternative tool could handle JSON and XML https   docs microsoft com en-us sql relational-databases xml openxml-sql-server  I have not yet tried to convert the XSLT scripts I use to SQL  or fully evaluated this option yet  but I hope to look into it more soon   Just some thoughts so far

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Try JOLT  It is a JSON to JSON transformation library written in Java    It was created specifically because we did not want to play the  JSON -  XML -  XSLT -  XML -  JSON  game  and using a template for any sufficiently complex transform is unmaintainable

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Why don t you converts JSON to XML using Mr  Data Coverter   tranform it using XSLT and then change it back to JSON using the same

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jq - lightweight and flexible command-line JSON processor  It s not template-based like XSLT  but more concise  e g  to extract name and address fields into an array    name   address   The tutorial walks through an example of transforming Twitter s  JSON API  and the manual has many examples

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Not too sure there is need for this  and to me lack of tools suggests lack of need  JSON is best processed as objects  the way it s done in JS anyway   and you typically use language of the objects itself to do transformations  Java for Java objects created from JSON  same for Perl  Python  Perl  c   PHP and so on   Just with normal assignments  or set  get   looping and so on   I mean  XSLT is just another language  and one reason it is needed is that XML is not an object notation and thus objects of programming languages are not exact fits  impedance between hierarchic xml model and objects structs

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