https://github.com/Julian/jsonschema

Installation:

$ pip3 install jsonschema

• error output is not very helpful
  • https://github.com/Julian/jsonschema/issues/623
  • no line and column numbers for errors - it sometimes shows data dumps where the error is :/

https://github.com/justinrainbow/json-schema

• Good error output:

  $ validate-json games/de.eiswuxe.blookid2.json schema.json
  JSON does not validate. Violations:
  [releases[0].versionCode] NULL value found, but a string is required
  [releases[0].date] Invalid date "2015-10-23T09:58:19Z", expected format YYYY-MM-DD
  [developer.supportEmail] NULL value found, but a string is required
  [developer.supportPhone] NULL value found, but a string is required