ABAP Online Compiler
Paste ABAP, press Run, and see the output — in your browser, with no SAP system, no login and nothing to install. This page explains how that is possible, what it can and cannot compile, and where the limits are.
What "compiling ABAP online" actually means here
ABAP normally runs inside a SAP NetWeaver or S/4HANA application server. There is no such server here.
Instead, ABAP Dojo parses your code and transpiles it to JavaScript,
then runs that JavaScript in a sandboxed iframe in your own browser. Output from
WRITE is sent back and shown in the output panel.
Both the parser and the transpiler come from the
abaplint project
(@abaplint/core and @abaplint/transpiler, MIT licensed).
Nothing is uploaded: your code never leaves the browser tab, which matters if what you are testing
came out of a client's system.
your ABAP → abaplint parser → transpiler → JavaScript → sandboxed iframe → outputWhat compiles today
- Variables, constants, and the numeric, character and string types
- Control flow:
IF/CASE/DO/WHILE/LOOP - Internal tables —
APPEND,READ TABLE,LOOP AT ... ASSIGNING,LINES() - String handling —
CONCATENATE,&&, string templates,STRLEN,CONDENSE - Local classes and interfaces:
CLASS ... DEFINITION, methods, inheritance, polymorphism - Modern expressions —
VALUE,FOR,REDUCE,COND,SWITCH, inlineDATA(...)
What does not compile — and why
These are honest limits, not bugs. A browser has no SAP system behind it, so anything that depends on one cannot run here. Knowing which is which saves you from debugging the wrong thing.
| Not supported | Why |
|---|---|
SELECT and other Open SQL |
There is no database and no DDIC. This needs an in-memory database simulation, which is not wired up yet. |
| DDIC types and structures | Types like MARA or BAPIRET2 live in the data dictionary of a real system. |
Most CL_* standard classes |
Only what open-abap-core reimplements exists. Define a local class instead when you just want to test logic. |
| Function modules, BAPIs, RFC | These are server-side repository objects. |
| Dynpro, ALV, screens | UI technology tied to the SAP GUI runtime. |
AUTHORITY-CHECK, locks, updates |
Depend on a system, its users and its transaction handling. |
The transpiler targets ABAP 7.02 syntax as its base. Newer syntax generally works, but if something very recent fails to transpile, that is usually why.
Errors you will see, and what they mean
- Syntax error on line N — the parser could not read your code. Usually a missing period, or a statement the 7.02 base does not know.
-
Transpile error — the code parsed, but there is no JavaScript equivalent.
This is what you get for
SELECTor an unknown standard class. -
Runtime error — it compiled and ran, then failed while executing,
exactly as it would in a real system: division by zero, an unbound reference, a failed
READ TABLE.
The distinction is useful on its own: a runtime error means your ABAP is valid and the logic is wrong, which is a very different fix from the first two.
Frequently asked
Is it really free, and do I need an account?
Free, and no account. There is no backend to sign into.
Does my code get uploaded anywhere?
No. Parsing, transpiling and execution all happen in your browser. The one exception is deliberate: the Share button encodes your code into the URL, so only share those links where you would paste the code itself.
Can I use this to check code an AI wrote for me?
Yes — that is what the AI Validator mode is for. It runs syntax, lint, transpile and runtime checks in one pass and flags mistakes LLMs make specifically in ABAP.
Will it behave exactly like my SAP system?
For language semantics, largely yes. For anything touching the database, DDIC or standard classes, no — see the table above. Treat it as a fast first check, not a substitute for testing on a real system.
Also worth reading: the online ABAP editor and how to practise ABAP without an SAP system.