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jsonparser
ProbeLabs23 findings · 123 requirementsThe fastest JSON parser for Go — formally verified with ReqProof (real library, master).
When ParseString encounters a string literal ending with a lone backslash (the escape sequence is incomplete because there is no character after the backslash), the parser shall return MalformedValueError.
Specification
The requirement exactly as authored — its complete prose text and, where present, the formal FRETish sentence it compiles to.
When ParseString encounters a string literal ending with a lone backslash (the escape sequence is incomplete because there is no character after the backslash), the parser shall return MalformedValueError.
the parser shall always satisfy !raw_string_has_backslash_at_end | returns_error_for_backslash_at_end
Rationale & tags
Why this requirement exists, and how it is categorised.
Rationale & tags
Why this requirement exists, and how it is categorised.
A backslash at the end of a string is the simplest truncated-escape case and exercises the len(in) < 2 guard in unescapeToUTF8.
Verification & provenance
How this requirement was checked: the review trail, edit history, and the machine-analysis status terms (each ⓘ explains what it means).
Review
- Status
- approved
- Reviewer
- Leonidbugaev
- Reviewed
- Apr 23, 2026, 00:00 UTC
History
- Created
- Apr 14, 2026, 18:00 UTC · Claude · AI agent
- Modified
- Apr 14, 2026, 18:00 UTC · Claude · AI agent
Change history
Every recorded revision of this requirement's source file — newest first, each with its commit message and the diff for that change.
Every recorded revision of this object's source — newest first, each with the commit message and its file-level diff.
Obligations
What this requirement must witness to be considered satisfied — the required evidence, and the tests that discharge each one.
No obligations recorded for this requirement
Proof obligations are recorded once evidence is generated. None have been captured here yet — this is expected, not a gap in the requirement itself. A required class of evidence the requirement must witness — the bridge between the requirement existing and it being proven.
Formula evidence
The formal formula behind this requirement, the variables it is written over, and the tests that exercise it (each term is explained inline).
Formula evidence
The formal formula behind this requirement, the variables it is written over, and the tests that exercise it (each term is explained inline).
FRETish formula
the parser shall always satisfy !raw_string_has_backslash_at_end | returns_error_for_backslash_at_end
Variables
| Name | Type | Direction | Description |
|---|---|---|---|
| raw_string_has_backslash_at_end | — | True when ParseString encounters a string ending with a lone backslash with no character after it. | |
| returns_error_for_backslash_at_end | — | True when ParseString returns MalformedValueError for a string ending with a lone backslash. |
Witnesses· 3 scenarios total
- TestMCDC_SYS_REQ_063_Row1_TriggerFalseexercises 1 condition scenario
- TestMCDC_SYS_REQ_063_Row2_InvariantViolationexercises 1 condition scenario
- TestMCDC_SYS_REQ_063_Row3_TrailingBackslashErrorexercises 1 condition scenario
MC/DC truth table· 3 rows
Each row assigns the formula's conditions (T/F) and shows the Result— the formula's value for that input row, not a test pass/fail. A row proves a condition when flipping only that condition flips the outcome. The test that covers each row is linked.
mcdc:ignoreNo-actionfalse-result row satisfied by designUncoveredneeds a covering test| # | raw_string_has_backslash_at_end | returns_error_for_backslash_at_end | Result | Proves | Covering test |
|---|---|---|---|---|---|
| 1 | F | F | T | raw_string_has_backslash_at_end | |
| 2 | T | F | F | raw_string_has_backslash_at_end | |
| 3 | T | T | T | returns_error_for_backslash_at_end |
Its place
This requirement shown inside its trace neighbourhood — the parents it satisfies, the code and tests attached to it, and its findings.
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Trace evidence
The concrete artifacts linked to this requirement — implementing code, verifying tests, documents, and the findings raised against it.
Impact
Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.
Impact
Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.
If you change this
Files to re-check (1)
- parser.goparser.go
Tests to re-run (2)
- deep_spec_test.godeep_spec_test.go
- mcdc_spec_witnesses_test.gomcdc_spec_witnesses_test.go
What this rests on
Parent requirements (1)
Discussions
Discuss this with the proof team. Nothing changes in your audit automatically — you open a request and a staff member records any outcome inside the thread.