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JSON Server vs @faker-js/faker: 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.

@faker-js/faker: JavaScript library that generates realistic fake data such as names, addresses and dates in many locales.

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 @faker-js/faker: metrics and documented facts, in the fixed row order used for test data and mocking comparisons.
FactJSON Server@faker-js/faker
Stars75,715115,4931
Forks7,26711,1281
Contributors9615641
Last release2026-03-2312026-08-141
Last commit2026-03-2312026-09-221
Commits in 90 days011411
LicenseMIT1MIT1
Primary languageJavaScript1TypeScript1
Statusslow1active1
Languages for writing testsnot documentednot found in the project's documentation as of JavaScript (browser and Node.js) source: Docs: Getting Started
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 (JavaScript API methods; mustache string templates via faker.helpers.fake) source: README
Framework integrationsnot documentednot found in the project's documentation as of Vitest, Jest, Cypress, Playwright (examples in docs) source: Docs: Frameworks
Install methodnpm (npm install json-server) source: READMEnpm (npm install --save-dev @faker-js/faker) source: README

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

@faker-js/faker

Fits projects that need fake data in JavaScript for testing and development; its README describes generating fake but realistic data in large amounts. source: README

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. Docs: Getting Started, read
  10. README, read
  11. README, read
  12. Docs: Frameworks, read

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