Why does this generate both a username and a password?

Because MONGODB-CR's hash construction, md5(username + ":mongo:" + md5(password)), mixes the username directly into the outer hash, so the resulting value is only meaningful paired with the exact username it was computed against. This tool shows all three, the random username, the random password, and the resulting hash, since the hash alone can't be interpreted without the username.

Where does the sample username and password come from?

Both are generated independently by this category's shared random-sample helper: a random word or phrase from a small built-in bank plus a random 8-character hex suffix, produced fresh via crypto.getRandomValues for each of them on every load and every Regenerate click.

Can I hash my own username and password instead of random samples?

Yes, use the MongoDB Hash Calculator, it accepts any username and password you type and produces the same 32-character hex format this tool generates from its own random samples.

Does this tool send anything to a server?

No. Both the random sample generation and the double-md5 hash computation (via @noble/hashes, an audited JavaScript library) run entirely in your browser.

Random MongoDB Hash Generator - Instant Sample MONGODB-CR Hash

Overview

Introduction

MONGODB-CR's password hash nests the username inside a second md5 pass, so this tool shows all three values together rather than an unpaired hash that wouldn't mean anything on its own.

It generates a random sample username and password and computes their MONGODB-CR hash, reusing this category's existing MongoDB hasher so the format matches exactly what a legacy MongoDB export would store.

What Is Random MongoDB Hash Generator?

A no-input variant of the MongoDB Hash Calculator: instead of typing a username and password, you get a fresh random sample pair and their MONGODB-CR hash on load, with a Regenerate button for an entirely new set anytime.

The construction is md5(username + ":mongo:" + md5(password)), MongoDB's original challenge-response authentication mechanism, deprecated since version 3.0 (2015) in favor of SCRAM-SHA-1/256.

How Random MongoDB Hash Generator Works

On load and on every Regenerate click, this category's shared random-sample helper is called twice, independently, once for the sample username and once for the sample password, each drawing a random word plus a random 8-character hex suffix via crypto.getRandomValues.

Both are passed to this category's existing calculateMongodbHash function, which first hashes the password alone with md5, then hashes that result combined with the username and the literal ':mongo:' separator to produce the final 32-character hex output.

When To Use Random MongoDB Hash Generator

Use this for a quick, no-effort example of MongoDB's legacy MONGODB-CR hash format, migration documentation, or a mockup that needs a plausible-looking old MongoDB export value.

For anything requiring a specific username/password pair's hash, use the MongoDB Hash Calculator instead; never rely on this deprecated format for new authentication design.

Often used alongside MongoDB Hash Calculator, Postgres Hash Calculator and MySQL Hash Calculator.

Features

Advantages

No input required, instantly produces a plausible username, password, and their MONGODB-CR hash together.
Uses genuinely secure randomness (crypto.getRandomValues) independently for both the username and password.
Shows all three values needed to interpret the hash correctly, rather than an unpaired hash that would be meaningless on its own.

Limitations

The sample word bank is small and fixed, so the non-random word portions repeat across regenerations even though the hex suffixes and resulting hash always differ.
This format's username-mixing design is a weaker substitute for genuine random salting, this generator exists for demonstration, not any real credential-storage example.
Not useful if you need the hash of a specific, known username/password pair, use the calculator tool for that instead.

Examples

One example regeneration

Input

username: user-profile-6c3d8b0f, password: session-token-2a9c4d7b

Output

b3f8e5a2c9d4b7f1e6a3c8d5b0f2e9a4

One illustrative username/password/hash triple; running the tool again produces a completely different username, password, and hash, since all three are freshly randomized on every regeneration.

Best Practices & Notes

Best Practices

Click Regenerate a few times if you're picking an example for migration documentation and want one that reads cleanly.
Always keep the username paired with its hash when documenting an example, the hash alone is not reproducible or verifiable without it.
For a real, reproducible hash of a specific username/password pair, switch to the MongoDB Hash Calculator instead.

Developer Notes

Calls this category's shared generateRandomSampleText() helper twice per regeneration (crypto.getRandomValues, not Math.random()), once each for username and password, then hashes both synchronously with the existing calculateMongodbHash function (inner md5 of password, outer md5 of username + ':mongo:' + that inner hash), matching the useEffect-after-mount pattern used across this category's random generators to avoid a hydration mismatch.

Random MongoDB Hash Generator Use Cases

Grabbing a quick example MONGODB-CR hash for migration documentation or a tutorial
Populating a UI mockup with a plausible-looking legacy MongoDB export entry
Seeing the format's nested double-md5 32-character output alongside the username/password pair it depends on
Comparing MongoDB's username-mixing pattern against PostgreSQL's structurally similar legacy format on independent random samples

Common Mistakes

Expecting the same username/password/hash set to reappear; all three are freshly randomized on every load and Regenerate click.
Discarding the username when noting down an example hash; without it, the hash can't be reproduced or verified.
Using this when you actually need the hash of a specific, known username/password pair; the MongoDB Hash Calculator is the right tool for that.

Tips

Need the hash to chain into another tool? Use the send-to-tool menu on the hash output panel.
Compare this tool's output shape against the Random Postgres Hash Generator, both mix a random username into a random password's hash, but with different constructions.

Random MongoDB Hash Generator