BSON to JSON

mongodump produces .bson files. MongoDB drivers store documents in BSON. But when you need to audit a dump, diff two documents, or push data into a JSON pipeline, the binary format gets in the way — timestamps are 8-byte integers, dates are milliseconds, and ObjectIds are unreadable byte soup.

Convert BSON to JSON parses a BSON document into readable JSON. Every standard type is decoded: numbers, strings, booleans, dates, ObjectIds, binary data, regexes, timestamps and nested documents and arrays.

• All core types: double, string, document, array, binary, boolean, datetime, null, regex, code, int32, int64, timestamp, decimal128.
• Readable conversions: Dates to ISO strings, ObjectIds to hex, binary to text when valid.
• Flexible input: Upload a file, or paste hex or base64.
• Byte-accurate errors: Unknown types and truncation report the offending offset.
• Nesting: Sub-documents and arrays convert recursively.
• Pretty output: The result is formatted JSON.
• Private: All decoding happens in your browser.

1. Upload a .bson file (e.g. from mongodump) or paste the bytes as hex or base64.
2. Review the decoded JSON — dates, ObjectIds and numbers are human-readable.
3. Check binary fields if any appear as hex blobs.
4. Copy or download the JSON document.

Example 1 — Auditing a dump. A DBA runs mongodump, uploads the .bson collection file here, and inspects the documents as JSON to verify the export contains what the app wrote.

Example 2 — Data migration. An engineer converts BSON exports to JSON to load into a PostgreSQL or analytics store, mapping ObjectIds to hex strings and dates to ISO 8601.

Example 3 — Debugging drivers. A developer captures a BSON document from a driver trace, decodes it here, and compares the fields against the expected schema.

Example 4 — Support tickets. A support engineer decodes a user-provided .bson export to read an error document without touching a MongoDB instance.

• No MongoDB needed: Dumps decode without a database.
• Lossless read: Every BSON type maps to a JSON representation.
• Human-readable: Dates, IDs and timestamps become plain text.
• Instant: Files decode in the browser in milliseconds.
• Zero upload: Data never leaves your machine.