How to escape special characters in building a JSON string

Question

Here is my string          user              name    abc            fx                  message                      color    red                              user                      color    blue                                      timestamp    2013-10-04T08  10  41 0100        message    I mABC          nanotime    19993363098581330          Here the message contains single quotation mark  which is same as the quotation used in JSON  What I do is fill up a string from user inputs such as message  So  I need to escape those kind of special scenarios which breaks the code  But other than string replace  is there any way to make them escape but still allow HTML to process them back to the correct message

User · Answer

To allow single quotes within doubule quoted string for the purpose of json, you double the single quote. {"X": "What's the question"} ==> {"X": "What''s the question"}

https://codereview.stackexchange.com/questions/69266/json-conversion-to-single-quotes

The \' sequence is invalid.

User · Answer

Everyone is talking about how to escape   in a  -quoted string literal  There s a much bigger issue here  single-quoted string literals aren t valid JSON  JSON is based on JavaScript  but it s not the same thing  If you re writing an object literal inside JavaScript code  fine  if you actually need JSON  you need to use     With double-quoted strings  you won t need to escape the     And if you did want a literal   in the string  you d use

User · Answer

Most of these answers either does not answer the question or is unnecessarily long in the explanation   OK so JSON only uses double quotation marks  we get that   I was trying to use JQuery AJAX to post JSON data to server and then later return that same information  The best solution to the posted question I found was to use   var d         name   whatever       address   whatever       DOB   01 01 2001      ajax       type   POST       url   some url       dataType   json       data  JSON stringify d               This will escape the characters for you   This was also suggested by Mark Amery  Great answer BTW  Hope this helps someone

User · Answer

Using template literals     var json      1440167924916    id  1440167924916  type   text   content   It s a test

User · Answer

The answer the direct question  To be safe  replace the required character with  u 4-digit-hex-value  Example  If you want to escape the apostrophe   replace with  u0027     D Amico becomes D u0027Amico  NICE REFERENCE  http   es5 github io x7 html x7 8 4  https   mathiasbynens be notes javascript-escapes

User · Answer

May be i am too late to the party but this will parse escape single quote  don t want to get into a battle on parse vs escape     JSON parse

User · Answer

Use encodeURIComponent   to encode the string  Eg   var product list   encodeURIComponent JSON stringify product list     You don t need to decode it since the web server automatically do the same

User · Answer

regarding AlexB s post        Apostrophe or single quote      Double quote   escaping single quotes is only valid in single quoted json strings escaping double quotes is only valid in double quoted json strings  example    Bart  s car        - gt  valid  Bart says   Hi     - gt  invalid

User · Answer

A JSON string must be double-quoted  according to the specs  so you don t need to escape    If you have to use special character in your JSON string  you can escape it using   character   See this list of special character used in JSON     b  Backspace  ascii code 08   f  Form feed  ascii code 0C   n  New line  r  Carriage return  t  Tab     Double quote     Backslash character     However  even if it is totally contrary to the spec  the author could use      This is bad because       It IS contrary to the specs   It is no-longer JSON valid string   But it works  as you want it or not   For new readers  always use a double quotes for your json strings

User · Answer

I m appalled by the presence of highly-upvoted misinformation on such a highly-viewed question about a basic topic   JSON strings cannot be quoted with single quotes  The various versions of the spec  the original by Douglas Crockford  the ECMA version  and the IETF version  all state that strings must be quoted with double quotes  This is not a theoretical issue  nor a matter of opinion as the accepted answer currently suggests  any JSON parser in the real world will error out if you try to have it parse a single-quoted string   Crockford s and ECMA s version even display the definition of a string using a pretty picture  which should make the point unambiguously clear     The pretty picture also lists all of the legitimate escape sequences within a JSON string              b  f  n  r  t  u followed by four-hex-digits   Note that  contrary to the nonsense in some other answers here     is never a valid escape sequence in a JSON string  It doesn t need to be  because JSON strings are always double-quoted   Finally  you shouldn t normally have to think about escaping characters yourself when programatically generating JSON  though of course you will when manually editing  say  a JSON-based config file   Instead  form the data structure you want to encode using whatever native map  array  string  number  boolean  and null types your language has  and then encode it to JSON with a JSON-encoding function  Such a function is probably built into whatever language you re using  like JavaScript s JSON stringify  PHP s json encode  or Python s json dumps  If you re using a language that doesn t have such functionality built in  you can probably find a JSON parsing and encoding library to use  If you simply use language or library functions to convert things to and from JSON  you ll never even need to know JSON s escaping rules  This is what the misguided question asker here ought to have done

[json] How to escape special characters in building a JSON string?

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