BSON to JSON Converter | Decode MongoDB BSON

BSON to JSON converter for mongodump .bson files and hex or base64 BSON. Writes MongoDB Extended JSON in relaxed or canonical mode, all in your browser.

Also known as: bson to json · bson to json converter online · bson viewer online · bson file viewer · mongodb bson to json · bson decoder · mongodump bson to json · extended json converter · bsondump online · bson to json converter online free

json tools

sql and database tools

file converters

converters

BSON Input

Extended JSON Output

Extended JSON mode

Layout

About BSON to JSON Converter

A BSON to JSON converter is used to read MongoDB data stored in binary form, such as the .bson files mongodump writes or a BSON payload copied from a log. This tool decodes every BSON type, including ObjectId, Decimal128, dates and binary UUIDs, and writes MongoDB Extended JSON v2 that you can read, diff or load back with mongoimport.

Key Features

Opens .bson files from mongodump, including gzipped .bson.gz files from mongodump --gzip
Accepts pasted BSON as hex or base64, so a payload copied from a log or a driver debug line converts directly
Writes Extended JSON v2 in relaxed mode, the mongoexport default, or canonical mode, which keeps every BSON type
Decodes all 21 BSON types, including Decimal128, Timestamp, regular expressions, MinKey, MaxKey and the deprecated DBPointer and Symbol
Outputs a pretty JSON array or one document per line, ready for mongoimport, jq or DuckDB
Keeps every complete document from a truncated dump and reports the byte offset where decoding stopped

Use Cases

Inspect a customers.bson file from a nightly mongodump before restoring it to a staging cluster in us-east-1
Check what a collection backup contains without installing the MongoDB Database Tools on a locked-down laptop
Decode a base64 BSON payload logged by a Node.js or Go service while debugging a production incident
Turn a small dump into JSON lines and query it with jq or DuckDB for a quick audit
Compare relaxed and canonical output to see why an int64 or Decimal128 field changed type after a migration

Supported Formats

.bson (mongodump)

.bson.gz (mongodump --gzip)

Hex bytes

Base64 and base64url

Extended JSON v2 relaxed

Extended JSON v2 canonical

Related Keywords

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What is the difference between relaxed and canonical Extended JSON?

BSON has more types than JSON, so MongoDB defines Extended JSON to carry them. Canonical mode wraps every typed value, so an int32 becomes {"$numberInt": "42"} and a date becomes {"$date": {"$numberLong": "1759329000000"}}, and nothing is lost on a round trip. Relaxed mode writes numbers as plain JSON numbers and dates from 1970 through 9999 as ISO strings, which is easier to read but no longer tells an int32 from an int64. ObjectId, Decimal128, binary, regex and timestamp values keep their $ wrappers in both modes.

Is my BSON data uploaded anywhere?

No. Files and pasted bytes are decoded in your browser and nothing is sent to a server, so customer records in a production dump stay on your machine.

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Frequently asked questions

What is BSON to JSON Converter used for?

BSON to JSON converter for mongodump .bson files and hex or base64 BSON. Writes MongoDB Extended JSON in relaxed or canonical mode, all in your browser.

Is BSON to JSON Converter free to use?

Yes. BSON to JSON Converter is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use BSON to JSON Converter?

No. BSON to JSON Converter works immediately in your browser with no signup, login, or email address required.

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