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wtf is json-schema?

jhass/json-schema — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2020-02-02

Audience · developerComplexity · 2/5DormantSetup · easy

TL;DR

A Ruby library that validates whether your data matches a defined schema, catching structural mistakes before they cause problems.

Mindmap

mindmap
  root((repo))
    What it does
      Validates data shape
      Pass fail or error list
      Supports JSON Schema drafts
    Tech stack
      Ruby
      JSON Schema
    Use cases
      Validate API requests
      Check batch data rows
      Custom format rules
    Audience
      Backend developers
      Data engineers

Code map

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filefunction / class

Why would anyone build with this?

REASON 1

Validate incoming API request bodies before processing them.

REASON 2

Check rows in a batch job against a schema before loading them into a database.

REASON 3

Catch type mistakes early, like a number sent where a string was expected.

REASON 4

Add custom validation rules or format checkers for business-specific data.

What's in the stack?

RubyJSON Schema

How it stacks up

jhass/json-schema0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2020-02-022022-10-032020-05-03
MaintenanceDormantDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 30min

Yoink these prompts

Prompt 1
Show me how to define a JSON Schema and validate a Ruby object against it using this library.
Prompt 2
Help me write a custom format checker for this validator to enforce a business-specific rule.
Prompt 3
Explain the difference between the three validation modes this library offers: boolean, error, and full list.
Prompt 4
How do I restrict this library from fetching external schemas over the network for security?

Frequently asked questions

wtf is json-schema?

A Ruby library that validates whether your data matches a defined schema, catching structural mistakes before they cause problems.

Is json-schema actively maintained?

Dormant — no commits in 2+ years (last push 2020-02-02).

How hard is json-schema to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is json-schema for?

Mainly developer.

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