Paste two TypeORM entity definitions or generated SQL and get an instant visual diff. See entities, columns, relations, and indexes that changed — then generate the migration SQL. No npx typeorm required.
SchemaLens parses your TypeORM schema (decorator entities or generated SQL), compares it against another version, and shows you exactly what changed — just like typeorm migration:generate, but in your browser with a visual UI.
See which entities were added, removed, or renamed. Catch accidental entity deletions before they drop tables.
Spot type changes, nullable vs non-nullable updates, default value changes, and decorator modifications at a glance.
Visualize added or removed @ManyToOne, @OneToMany, and @ManyToMany relations that affect your data integrity.
Compare @Index, @Unique, and composite index declarations. Missing indexes can kill query performance.
Export migration scripts in PostgreSQL, MySQL, SQLite, SQL Server, or Oracle dialects — ready to run with typeorm migration:run.
Share a diff URL with your team or paste it in a PR review. No screenshots, no copy-paste needed.
Both tools compare schemas. SchemaLens adds a visual layer and works without installing anything.
| Feature | SchemaLens | typeorm migration:generate | TypeORM Studio |
|---|---|---|---|
| Browser-based (no install) | ✅ Yes | ❌ CLI only | ❌ CLI + local DB |
| Visual diff UI | ✅ Yes | ❌ SQL files | ❌ No diff |
| Compare two arbitrary schemas | ✅ Paste any two | ✅ Yes | ❌ No |
| Multi-dialect SQL output | ✅ 5 dialects | ❌ Target only | ❌ No |
| Shareable diff URLs | ✅ Yes | ❌ No | ❌ No |
| Breaking change warnings | ✅ Yes | ❌ No | ❌ No |
| Cross-dialect migrations | ✅ Yes | ❌ No | ❌ No |
| View/edit live data | ❌ No | ❌ No | ✅ Yes |
SchemaLens complements your TypeORM workflow. Use it when you need speed, shareability, or a visual review layer.
Paste the before/after schema into SchemaLens and drop the shareable link in your PR. Reviewers see exactly what changed without running typeorm migration:generate locally.
Export your staging and production schemas, paste them both, and verify the diff before promoting to prod. Catch drift that migrations didn't account for.
Not everyone on your team has TypeORM installed or knows CLI flags. SchemaLens lets designers, PMs, and junior devs review schema changes in a familiar visual interface.
Moving from PostgreSQL to MySQL? SchemaLens shows you the semantic differences and generates the target dialect's migration SQL — something TypeORM CLI can't do across databases.
SchemaLens is not a replacement for TypeORM migrations. It's a visual companion for the moments when you need to see the diff, share it, or review it quickly.
Copy your entity .ts files or run typeorm migration:generate and grab the generated SQL. Paste it into SchemaLens.
Paste the older (or newer) version you want to compare against. SchemaLens parses both automatically.
Visual highlights show added entities, removed columns, type changes, and index modifications. Breaking changes are flagged in red.
Export migration SQL in your target dialect, or copy a shareable link to paste in Slack, Jira, or your PR description.
No signup. No install. Paste two schemas and see the diff in 5 seconds.
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