Aggregation Cheat Sheet
Every core MongoDB aggregation stage, accumulator, and expression operator, plus copy-paste examples and common recipes.
Open cheat sheetSQL Cheat Sheet
SELECT, joins, grouping, window functions, CTEs, DML and DDL. The SQL you use every day, ready to copy.
Open cheat sheetVisual Schema Designer
Sketch a schema diagram right in your browser, load a sample or start blank, add collections and fields, and link them. No database, no signup.
Open designerExplain Plan Visualizer
Paste a MongoDB explain("executionStats") plan and see it as a readable execution tree, stages, index usage, docs examined, and timings. Nothing leaves your browser.
SQL Explain Plan Visualizer
Paste a SQL EXPLAIN plan from PostgreSQL, MySQL, SQL Server, or Oracle and see it as a readable execution tree with costs, rows, and timings. The database is auto-detected.
Open visualizerMongoDB Connection String Builder
Fill in host, auth, and options, get a clean, standard mongodb:// / mongodb+srv:// URI. Standalone, replica set, sharded, or Atlas SRV.
SQL Connection String Builder
Build URI and JDBC connection strings for PostgreSQL, MySQL, MariaDB, SQL Server, Oracle, SQLite, and more, with the right port and SSL options per engine.
Open builderObjectId Decoder
Decode a MongoDB ObjectId into its timestamp, random value, and counter, or build an ObjectId for any date for _id range queries.
Open decoderExtended JSON Converter
Convert MongoDB Extended JSON between Canonical, Relaxed, and Plain JSON. Rewrites $oid, $date, $numberLong and other type wrappers for you.
Open converterBSON Size Calculator
Estimate the BSON byte size of a document and see how close it is to MongoDB's 16 MB document limit.
Open calculator