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JSON Server vs Mockito: open-source test data and mocking tools compared

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

Summary

JSON Server: npm package that serves a REST API with filtering, sorting and pagination from a JSON file.

Mockito: Java mocking framework for unit tests covering mock creation, stubbing, verification and spies.

Both are listed under Test data and mocking. The table gives repository metrics from the GitHub API with their fetch date, then the documented facts used for every comparison in this category, each linked to the README or docs page it comes from. A cell reads "not documented" when the fact was not found in the project's documentation (3 of 10 fact cells here); that does not mean the feature is absent.

Side by side

JSON Server and Mockito: metrics and documented facts, in the fixed row order used for test data and mocking comparisons.
FactJSON ServerMockito
Stars75,715115,4571
Forks7,26712,6701
Contributors9613491
Last release2026-03-2312026-03-111
Last commit2026-03-2312026-09-091
Commits in 90 days0191
LicenseMIT1MIT1
Primary languageJavaScript1Java1
Statusslow1active1
Languages for writing testsnot documentednot found in the project's documentation as of Java source: README
ProtocolsHTTP (REST API routes for GET, POST, PUT, PATCH, DELETE) source: READMEnot documentednot found in the project's documentation as of
Definition formatJSON or JSON5 data file (db.json or db.json5) source: READMECode (Java API: mock(), when(), verify(); @Mock, @Spy and @InjectMocks annotations) source: Docs: Mockito site
Framework integrationsnot documentednot found in the project's documentation as of JUnit 4 (MockitoJUnitRunner, MockitoRule); JUnit 5 extension source: Docs: Mockito Javadoc
Install methodnpm (npm install json-server) source: READMEMaven Central dependency org.mockito:mockito-core (Gradle, Maven) source: Docs: Mockito site

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

When each fits

Written from each project's documented scope, not from preference. Neither tool is ranked.

JSON Server

Fits projects that need a REST API served from a JSON data file; its README describes query parameters for conditions, sorting, pagination and embedded relations. source: README

Mockito

Fits projects that write unit tests in Java with mock objects; its docs describe a mocking framework for unit tests in Java. source: Docs: Mockito site

More on these tools

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: repository, read
  3. GitHub REST API: contributors, read
  4. GitHub REST API: contributors, read
  5. GitHub REST API: latest release, read
  6. GitHub REST API: latest release, read
  7. GitHub REST API: commits, read
  8. GitHub REST API: commits, read
  9. README, read
  10. README, read
  11. Docs: Mockito site, read
  12. Docs: Mockito Javadoc, read

Documented facts collected 2026-09-22. See the methodology for how metrics and facts are gathered.