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Open Source

High-performance FHIR 
validation for Go

Validate FHIR R4, R4B, and R5 resources against StructureDefinitions, profiles, and terminology 
with a fast, embeddable Go library and CLI tool.

Get Started View on GitHub

Profile-Driven Validation

All validation rules derived from StructureDefinitions. No hardcoded logic — supports any FHIR profile or Implementation Guide.

HL7 Validator Compatible

Designed to produce the same validation results as the HL7 FHIR Validator, with significantly faster startup and lower memory usage.

FHIRPath Constraints

Full FHIRPath evaluation engine for invariant constraints defined in ElementDefinitions, including resolve() and memberOf().

Quick Start

Requires Go 1.23 or later.

Install the validator:

go get github.com/gofhir/validator

Validate a FHIR resource:

package main

import (
    "fmt"

    "github.com/gofhir/validator"
)

func main() {
    v := validator.New()
    result := v.ValidateFile("patient.json")

    for _, issue := range result.Issues() {
        fmt.Printf("[%s] %s: %s\n", issue.Severity, issue.Expression, issue.Diagnostics)
    }
}

Or use the CLI:

gofhir-validator patient.json
Read the full guide