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Description

Error 9, 'Failed To Parse', indicates that MongoDB encountered an invalid or unparseable input during an operation. This typically happens when the server cannot interpret the syntax of a query, a configuration file, or data being processed.

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Error Message

Failed To Parse

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Known Causes

4 known causes

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Malformed Query or Command Syntax

The query, aggregation pipeline stage, or database command sent to MongoDB contains syntax errors, such as missing brackets, quotes, or incorrect operators.

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Invalid BSON Data Format

Data being inserted, updated, or manipulated does not conform to the BSON specification, leading to parsing issues when MongoDB tries to interpret it.

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Incorrect Configuration File Syntax

The `mongod.conf` file or other configuration inputs contain syntax errors, preventing the MongoDB server from starting or applying settings correctly.

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Unrecognized Command Line Arguments

MongoDB was launched with command-line arguments that are malformed, misspelled, or not recognized by the server.

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Solutions

4 solutions available

1. Fix JSON/BSON Syntax easy

Correct malformed document structure

1

Fix JSON syntax errors

// Wrong (missing quotes on keys):
db.users.insertOne({ name: "John", age: 30 })  // This is actually OK in shell

// Wrong (trailing comma):
db.users.insertOne({ name: "John", })  // Error!

// Right:
db.users.insertOne({ name: "John" })

2. Fix Query Parser Errors easy

Correct query operator syntax

1

Fix operator placement

// Wrong:
db.users.find({ $and: { status: "active" } })

// Right:
db.users.find({ $and: [{ status: "active" }, { role: "user" }] })

2

Fix regex syntax

// Wrong:
db.users.find({ email: { $regex: "@gmail" } })

// Right:
db.users.find({ email: { $regex: /@gmail/, $options: "i" } })
// Or:
db.users.find({ email: /gmail/i })

3. Validate JSON Input easy

Check JSON validity before sending

1

Validate in JavaScript

try {
  JSON.parse(jsonString);
} catch (e) {
  console.error('Invalid JSON:', e.message);
}

2

Use JSON validators

# Online: jsonlint.com
# CLI: jq . file.json

4. Fix Extended JSON medium

Handle BSON types in JSON

1

Extended JSON syntax

// Extended JSON for special types:
{
  "_id": { "$oid": "507f1f77bcf86cd799439011" },
  "date": { "$date": "2024-01-15T00:00:00Z" },
  "decimal": { "$numberDecimal": "123.45" }
}

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Related Errors

5 related errors

MongoDB Error 9: Failed To Parse