Node.js没有解析字符串化的JSON，在线验证者将其视为有效的JSON？

Question

I have this JSON string in my test.js file:

let a=JSON.parse(`{
    "context1": [{
        "ID": 4,
        "CONTEXT": "bye",
        "CREATED_TIME": "2017-12-17 03:56:53.761",
        "LAST_UPDATED_TIME": "2017-12-17 03:56:53.761"
    }],
    "context_INSERT": {
        "error": "StatementCallback; bad SQL grammar [insert into context(context, created_time, last_updated_time) values('someone',2017-12-16 09:49:00.09','2017-12-16 09:49:00.09')]; nested exception is org.h2.jdbc.JdbcSQLException: Syntax error in SQL statement \"insert into context(context, created_time, last_updated_time) values('someone',2017-12-16 09:49:00.09','2017-12-16 09:49:00.09[*]')\"; SQL statement:\ninsert into context(context, created_time, last_updated_time) values('someone',2017-12-16 09:49:00.09','2017-12-16 09:49:00.09') [42000-196]\n\tat org.h2.message.DbException.getJdbcSQLException(DbException.java:345)\n\tat org.h2.message.DbException.get(DbException.java:179)\n\tat org.h2.message.DbException.get(DbException.java:155)\n\tat org.h2.message.DbException.getSyntaxError(DbException.java:191)\n\tat org.h2.command.Parser.getSyntaxError(Parser.java:534)\n\tat org.h2.command.Parser.checkRunOver(Parser.java:3766)\n\tat org.h2.command.Parser.initialize(Parser.java:3677)\n\tat org.h2.command.Parser.parse(Parser.java:308)\n\tat org.h2.command.Parser.parse(Parser.java:297)\n\tat org.h2.command.Parser.prepareCommand(Parser.java:258)\n\tat org.h2.engine.Session.prepareLocal(Session.java:578)\n\tat org.h2.server.TcpServerThread.process(TcpServerThread.java:264)\n\tat org.h2.server.TcpServerThread.run(TcpServerThread.java:158)\n\tat java.lang.Thread.run(Unknown Source)\n"
    },
    "contexts": [{
        "ID": 3,
        "CONTEXT": "greetings",
        "CREATED_TIME": "2017-12-16 09:49:00.09",
        "LAST_UPDATED_TIME": "2017-12-16 09:49:00.09"
    }, {
        "ID": 4,
        "CONTEXT": "bye",
        "CREATED_TIME": "2017-12-17 03:56:53.761",
        "LAST_UPDATED_TIME": "2017-12-17 03:56:53.761"
    }]
}`);
console.log('done');
if(a.context_INSERT.error){
    console.log(a.context_INSERT.error);
}

Node gives me following error when I run above program:

undefined:9
                "error": "StatementCallback; bad SQL grammar [insert into context(context, created_time, last_updated_time) v
alues('someone',2017-12-16 09:49:00.09','2017-12-16 09:49:00.09')]; nested exception is org.h2.jdbc.JdbcSQLException: Syntax
error in SQL statement "insert into context(context, created_time, last_updated_time) values('someone',2017-12-16 09:49:00.09
','2017-12-16 09:49:00.09[*]')"; SQL statement:


                        ^

SyntaxError: Unexpected token i in JSON at position 429
    at JSON.parse (<anonymous>)
    at Object.<anonymous> (C:\Users\IBM_ADMIN\Desktop\temp\test1\test.js:1:74)
    at Module._compile (module.js:573:30)
    at Object.Module._extensions..js (module.js:584:10)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)
    at Function.Module.runMain (module.js:609:10)
    at startup (bootstrap_node.js:158:16)
    at bootstrap_node.js:598:3

However online JSON parser like : https://jsonlint.com/ is passing, the string as a valid JSON ?

Which one is correct and what change I need to do in my string to make it valid json for node?

Answer 1

The string you are passing to the online validator is not the same as the string you are passing to JSON.parse !

JSON and JavaScript share a common set of escape characters.

The JavaScript parser will consume then when parsing your template string literal. This means that this section (for example):

 SQL statement \\"insert into context 

includes an escaped double quote in JavaScript source code which represents a literal double quote in JSON.

Literal double quotes are not allowed in the middle of strings in JSON. The double quote ends the JSON string and the i that follows it is therefore invalid.

You need to escape the \\ in the JavaScript source code so that it appears as an escape character in the JSON.

SQL statement \\"insert into context

---

There is almost never a good reason to embed JSON in a string literal in a JavaScript program. It is almost always better to just treat the JSON as literal JavaScript syntax.

let a = {
    "context1": [{
    // etc
};