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1.0.2 • Public • Published


Performance benchmark for Node.js JSON-schema validators.

Also tests against official JSON-schema test suite and checks for validators that cause side-effects on schema or data.

Contribute to these benchmarks



Validator Relative speed Number of test runs per second
ajv 100% 20121 (± 0.57%)
jsen 63.4% 12754 (± 0.75%)
is-my-json-valid 59.7% 12011 (± 0.67%)
schemasaurus 17.3% 3485 (± 2.51%)
themis 12.2% 2446 (± 1.64%)
z-schema 6.3% 1275 (± 1.55%)
jjv 3.8% 763 (± 2.7%)
jsck 2.6% 528 (± 3.75%)
jsonschema 0.6% 128 (± 2.8%)
skeemas 0.6% 125 (± 3.43%)
request-validator 0.4% 78 (± 3.25%)
tv4 0.2% 32 (± 4.48%)
jayschema 0.1% 13 (± 6.01%)

Validators tested: is-my-json-valid, jsen, ajv, themis, z-schema, jjv, skeemas, jayschema, schemasaurus, jsck, jassi, JSV, request-validator, json-gate, json-model, tv4, jsonschema, revalidator,

(validators not in the results above where excluded because of failing tests - see below for details)

ajv is currently the fastest JSON-schema validator out there.

The fastest validator has 100%, the rest a lower score relative to the fastest. If a validator has a score of 5% that means that it's speed is 5% of the fastest, meaning that it's 20 times slower than the fastest.

Test failure summary

This test suite uses the official JSON-schema test suite.

If a validator does not pass a test in the official test suite, it will show up in these results.

failing tests

Validator Number of failing tests (click for details)
ajv 1
skeemas 1
z-schema 3
jsonschema 3
jjv 4
is-my-json-valid 9
jayschema 10
jsen 11
themis 13
schemasaurus 15
jsck 21
tv4 24
request-validator 26
jassi 31
json-model 40
JSV 54
json-gate 70
revalidator 199

Some validators have deliberately chosen not to support parts of the spec. Go to the homepage of the validator to learn if that is the case for these tests.

Side-effects summary

Number of tests that caused side-effects. The schema or data was altered by the validator.

Validator Number of side-effects (BAD)
tv4 2
revalidator 147
json-model 283

Validators not in the list have no side-effects on data or schemas.

Features of validators

Note that these benchmarks and tests do not take into account other more advanced features of the validators. I encourage you to take a look at each validator if you are looking for special features.

Benchmarks by validator authors and others

Several of the validators have build benchmarks themselves. They are more detailed then the benchmarks provided above.

Benchmarks owned by themis

Benchmarks owned by z-schema

Benchmarks owned by jsck

There is also a benchmark suite by cosmicrealms.




npm i json-schema-benchmark

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