Frontend Frameworks

is-my-json-valid

Extremely fast JSON Schema validator using code generation.

Status
Generally available
Last checked
Checked · Oct 11, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

is-my-json-valid is a high-performance JSON schema validation tool that generates JavaScript code for faster execution. It's ideal for applications requiring rapid and accurate JSON validation.

is-my-json-valid stands out with its unique approach to generating JavaScript code for validation, offering unparalleled speed and efficiency compared to traditional JSON validators.

When it fits — and when it doesn’t

A good fit for

  • Developers needing fast, accurate validation for large volumes of JSON data

  • Projects where performance is critical and rapid validation is required

  • Teams working on real-time applications that require strict JSON schema adherence

Look elsewhere if

  • Applications requiring complex, dynamic schema changes at runtime

  • Scenarios where the overhead of code generation outweighs benefits

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited language support

    The tool is primarily designed for JavaScript and lacks robust support or native integration with other languages.

  2. 02

    Complex setup for advanced use cases

    Advanced schema definitions require a deep understanding of JSON Schema specification, which can be complex to set up correctly.

  3. 03

    Poor documentation for edge cases

    Documentation is lacking detailed examples and explanations for handling more complex or less common validation scenarios.

  4. 04

    Debugging generated code can be difficult

    Since the tool generates JavaScript code, debugging issues in the generated code can be challenging due to the abstraction layer.

What it does well

  • Uses code generation for faster validation

  • High-performance JSON schema validation

  • Easy integration as a JavaScript library

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up is-my-json-valid

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →