What does hard-code mean in software engineering?

Hard-code means to write fixed values directly into your source code instead of using variables, configuration files, or environment variables. For example, writing the database URL directly as a string in your code rather than reading it from a config file is hard-coding.

Why is hard-coding considered bad practice?

Hard-coding is problematic because it makes code inflexible and difficult to maintain. When values are hard-coded, you must modify the code and redeploy to change them. This also creates security risks if sensitive information like passwords or API keys are hard-coded and exposed in your repository.

When is it acceptable to hard-code values?

It is generally acceptable to hard-code true constants that never change across different environments, such as mathematical constants (pi, gravity) or fixed application settings that should never be modified. However, any value that might differ between environments (URLs, credentials, feature flags) should not be hard-coded.

How do you use hard-code in a sentence at work?

You might say: Do not hard-code the API endpoint (use environment variables instead), or The previous developer hard-coded all the configuration values, which makes it impossible to deploy to production.

What is the opposite of hard-coding?

The opposite is to parameterize or externalize values. This means moving them to configuration files, environment variables, or a database so they can be changed without modifying source code.

hard-code meaning in tech — Speak Tech English

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

Say it like this

✓We should not hard-code the API key.

✓I hard-coded the password by mistake.

✓Let us avoid hard-coding these values.

Real examples

in a code review

"This looks good, but please do not hard-code the server address. Use a config file instead."

in a standup

"We hard-coded some test values yesterday, but we need to fix that before production."

in a team meeting

"The previous developer hard-coded all the settings, which makes it impossible to deploy to different environments."

Don't say this

Handle with care. Do not confuse with simply writing code. Hard-coding specifically means embedding fixed values directly in code instead of using variables or configuration files.

✕We need to hard-code this feature into the system.

✓We need to implement this feature.— Hard-code specifically refers to embedding fixed values, not implementing features. Use implement for features.

✕The URL is hard-coded in the application.

✓The URL is hard-coded in the code.— Hard-code describes values in source code specifically, not the entire application.

✕Should we hard-code this constant?

✓Is it acceptable to hard-code this constant?— When a value truly never changes, hard-coding might be acceptable. Phrase as a question rather than a statement of concern.

Other forms

verb (present tense)

hard-code

"We hard-code the API endpoint in the configuration module."

verb (past tense)

hard-coded

"The previous team hard-coded sensitive data into the source files."

adjective

hard-coded

"We need to replace these hard-coded values with environment variables."

Often used with

hard-code a valueTo embed a specific fixed value directly in code

hard-code a pathTo write a file path or URL directly into source code

hard-coded credentialsUsernames, passwords, or API keys written directly in code (security risk)

avoid hard-codingTo use configuration or environment variables instead of fixed values

Similar words

embedBroader term; hard-code is more specific to writing fixed values in code

bake inInformal synonym meaning to include something permanently in code

Opposites

parameterizeexternalizeconfigure

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. You find a username and password written directly in the code. What do you say in a code review?

We hard-coded credentials here, which is a security risk.The hard-coded credentials must be moved to environment variables.This hard-coded authentication will cause problems in production.All options are natural.

Complete the sentence

2. During the migration, we accidentally _______ the database URL instead of using the config file.

Spot the mistake

3. Which sentence uses hard-code incorrectly?

We should not hard-code the API key in our source code.The developer hard-coded a test value that should be a variable.The hard-code feature is not working in the latest version.We need to remove all hard-coded settings before deployment.

Rewrite naturally

4. Rewrite using hard-code: We put the server address directly into the program code instead of putting it in a separate file where it can be changed easily.

Questions

Quick poll

Have you said "hard-code" in a standup this week?

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