How to escape $ while inserting inside mongoDB - node.js

Question

I have a large object which I have no control over, fields might vary a lot:
Error ==>> { MongoError: The dollar ($) prefixed field '$' in
'value.external.originalRequest.rawRequest.ns2:LoadData.Orders.0.Order.0.TotalThirdPartyCharge.0.CurrencyValue.0.$'
is not valid for storage. 0|lt-check | at
Function.MongoError.create
(/home/ops/lt-checkin-api/node_modules/mongodb-core/lib/error.js:31:11)
0|lt-check | at
/home/ops/lt-checkin-api/node_modules/mongodb-core/lib/connection/pool.js:497:72
0|lt-check | at authenticateStragglers
(/home/ops/lt-checkin-api/node_modules/mongodb-core/lib/connection/pool.js:443:16)
0|lt-check | at Connection.messageHandler
(/home/ops/lt-checkin-api/node_modules/mongodb-core/lib/connection/pool.js:477:5)
0|lt-check | at Socket.
(/home/ops/lt-checkin-api/node_modules/mongodb-core/lib/connection/connection.js:333:22)
0|lt-check | at Socket.emit (events.js:159:13) 0|lt-check | at
addChunk (_stream_readable.js:265:12) 0|lt-check | at
readableAddChunk (_stream_readable.js:252:11) 0|lt-check | at
Socket.Readable.push (_stream_readable.js:209:10) 0|lt-check | at
TCP.onread (net.js:608:20) 0|lt-check | name: 'MongoError',
0|lt-check | message: 'The dollar ($) prefixed field \'$\' in
\'value.external.originalRequest.rawRequest.ns2:LoadData.Orders.0.Order.0.TotalThirdPartyCharge.0.CurrencyValue.0.$\'
is not valid for storage.', 0|lt-check | ok: 0, 0|lt-check |
errmsg: 'The dollar ($) prefixed field \'$\' in
\'value.external.originalRequest.rawRequest.ns2:LoadData.Orders.0.Order.0.TotalThirdPartyCharge.0.CurrencyValue.0.$\'
is not valid for storage.', 0|lt-check | code: 52, 0|lt-check |
codeName: 'DollarPrefixedFieldName' }
Here the key causing the error:
"rawRequest": {
"ns2:LoadData": {
"$": {
"xmlns:ns2": "http://schemas.3gtms.com/tms/v1/tns"
},
"BatchInfo": [
{
"$": {
"xmlns": ""
},
As there are multiple keys starting with $.
Is there a setting in mongoose or mongoDB itself to insert anything without validating the request coming in.

Answer 1

Was going to create a new plugin but #Anirudh helped me find this package in the comment
https://www.npmjs.com/package/mongo-escape
To use it, just before your insert query escape you object using the above package.
var escapeForMongo = require('mongo-escape').escape;
userInput = escapeForMongo({
'foo': 'bar',
'ba.z': {
'$in': 'quz'
}
})

Answer 2

function escapeMongo(obj) {
return JSON.parse(
JSON.stringify(obj),
function(p, v) {
if ((p[0] === '$') || (p.includes('.'))) {
this[p.replace(/\$/g, '\uFF04').replace(/\./g, '\uFF0E')] = v;
return;
}
return v;
}
)
}
userInput = {
'foo': 'bar',
'ba.z': {
'$in': 'quz'
}
}
console.log(userInput)
console.log(escapeMongo(userInput))
You can use JSON.parse to process a JSON string before creating object.