What does sanity check mean in software engineering?

A sanity check is an informal, quick verification to ensure that something is logically correct or makes sense before proceeding. It is not a comprehensive test but a rapid reality check of basic assumptions or outputs. For example, checking that a calculated age is not negative is a sanity check.

How do you use sanity check in a sentence at work?

You can use it as both a noun and a verb. As a noun: 'We need to do a sanity check before shipping.' As a verb: 'Can you sanity check the login flow?' It is typically used casually in conversations, Slack messages, and code review comments.

Is sanity check formal or informal?

Sanity check is informal and conversational. It is widely used and understood in tech, but it is not appropriate for formal documents or professional presentations where you would say verification, validation, or testing instead.

What is the difference between a sanity check and a unit test?

A sanity check is quick and informal—often done manually or in conversation to catch obvious errors. A unit test is formal, automated, and comprehensive, testing specific code behavior. Sanity checks happen early in development; unit tests are part of the testing process.

Can you sanity check numbers or only code?

You can sanity check anything that can be verified as reasonable or logical: numbers, designs, assumptions, database migrations, API responses, or configurations. The term is very flexible in tech teams.

sanity check meaning in tech — Speak Tech English

Commonness	5/5
Versatility	4/5
Formality	CasualFormalCasual
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓Let me do a quick sanity check on this logic.

✓Can we sanity check the numbers before we present?

✓This needs a sanity check—something feels off.

Real examples

in a standup

"I finished the payment flow yesterday, but I want to run one more sanity check before deploying."

in a code review

"Good work on the refactor. Just want to sanity check—are we still handling null values correctly?"

in a team meeting

"Before we ship, let us do a sanity check on the performance metrics to make sure they look reasonable."

Don't say this

Handle with care. Do not use as a noun meaning an actual mental health check. It is only used metaphorically for verification of logic or correctness. Avoid in sensitive discussions about mental health.

✕We need to sanity check to see if this person is mentally healthy.

✓We should verify that this person has proper mental health support.— Sanity check is only a tech metaphor for logical verification, not an actual mental health evaluation.

✕The sanity check found that our code is perfect.

✓The sanity check verified that our basic logic is sound.— Sanity checks catch obvious errors but do not guarantee perfection or comprehensive correctness.

Other forms

noun

sanity check

"We need to run a sanity check on the database migration."

verb

sanity check (verb)

"Can you sanity check my assumptions about the API response format?"

Often used with

run a sanity checkMost common form; means to perform or execute the verification

do a sanity checkCasual alternative to 'run'; equally common in tech teams

quick sanity checkEmphasizes the speed and informality of the verification

sanity check failedIndicates the verification revealed a problem or illogical result

sanity check passedConfirms that basics are correct and the item is ready to proceed

Similar words

reality checkSimilar meaning; less technical but more general across industries

verificationMore formal; lacks the casual tone of sanity check

quick testBroader term; does not carry the same casual, colloquial tone

smoke testMore technical term in testing; checks if basics work without deep testing

Opposites

comprehensive testingignoreassume correctness

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your teammate proposes a change to the database schema. How do you respond most naturally?

Let me do a quick sanity check on this.Let me perform a sanity check on this.Let me verify the sanity check of this.Let me check the sanity of this.

Complete the sentence

2. Before we merge this PR, we should _______ on the test coverage numbers.

Spot the mistake

3. Which sentence uses 'sanity check' incorrectly?

We ran a sanity check and found the numbers do not add up.The sanity check on the user input validation looks good.We need a mental sanity check before making this hire.Can you sanity check the API response format?

Rewrite naturally

4. Rewrite in natural tech English using 'sanity check': 'We should quickly verify that the new feature works correctly with the old system before we release it.'

Questions

Quick poll

Have you said "sanity check" in a standup this week?

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