diff --git a/README.md b/README.md
index d948083..24f761e 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,6 @@
 
 CLI utility for defining custom project initialization scripts.
 
-TODO:
-- [ ] Add evaluator tests.
-- [ ] Color output to console.
-
 ## Overview
 
 `bootstrap` is a tool for quickly defining your own init-like scripts. If you
diff --git a/include/error.h b/include/error.h
index 61b2111..19b053f 100644
--- a/include/error.h
+++ b/include/error.h
@@ -95,7 +95,7 @@ Take the `__VA_ARGS__` list and append a list of decreasing numbers
     __VA_ARGS__,  \
     0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18, \
     0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10, \
-    0x0E, 0x0F, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08, \
+    0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08, \
     0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00)
 
 #define ALEN0( \
@@ -121,13 +121,20 @@ It is the responsibility of the caller to free the @ref Error instance.
 #define ERROR_NEW(code, ...) \
   ERROR_NEW0(code, ALEN(__VA_ARGS__), __VA_ARGS__)
 
-#define ERROR_NEW0(code, nargs, ...)                                   \
-  priv_error_new(                                                      \
-    (code), (nargs + 1), (const char * [nargs + 1]){__VA_ARGS__, "\n"} \
-  )
+#define ERROR_NEW0(code, nargs, ...) \
+  priv_error_new((code), (nargs), (const char *[nargs]){__VA_ARGS__})
 
 // clang-format on
 
+#define ANSI_BLACK(...) "\e[0;30m", __VA_ARGS__, "\e[0m"
+#define ANSI_RED(...) "\e[0;31m", __VA_ARGS__, "\e[0m"
+#define ANSI_GREEN(...) "\e[0;32m", __VA_ARGS__, "\e[0m"
+#define ANSI_YELLOW(...) "\e[0;33m", __VA_ARGS__, "\e[0m"
+#define ANSI_BLUE(...) "\e[0;34m", __VA_ARGS__, "\e[0m"
+#define ANSI_PURPLE(...) "\e[0;35m", __VA_ARGS__, "\e[0m"
+#define ANSI_CYAN(...) "\e[0;36m", __VA_ARGS__, "\e[0m"
+#define ANSI_WHITE(...) "\e[0;37m", __VA_ARGS__, "\e[0m"
+
 /**
 @brief Deallocates a previously allocated @ref Error isntance.
 
diff --git a/include/validator.h b/include/validator.h
index 0f6d061..6189853 100644
--- a/include/validator.h
+++ b/include/validator.h
@@ -6,6 +6,7 @@
 #define _BOOTSTRAP_VALIDATOR_H
 
 #include "cJSON.h"
+#include "config.h"
 #include "dyn_array.h"
 #include "error.h"
 
@@ -52,6 +53,8 @@ struct Field {
 /**
 @brief Verify the `spec.json` file is formatted correctly.
 
+@param config
+ A reference to the parameters describing the desired spec.
 @param parsed
  A possible null pointer to the parsed `spec.json` file. If null, this method
  simply sets *fields to a null pointer.
@@ -62,7 +65,9 @@ struct Field {
  A null pointer if no error occurs. Otherwise an @ref Error pointer.
 */
 struct Error *validate_spec_json(
-  const cJSON *const parsed, struct DynArray **fields
+  const struct Config *const config,
+  const cJSON *const parsed,
+  struct DynArray **fields
 );
 
 #endif /* _BOOTSTRAP_VALIDATOR_H */
diff --git a/main.c b/main.c
index bcbc83d..6d61f0a 100644
--- a/main.c
+++ b/main.c
@@ -33,7 +33,7 @@ static int run(const char *root_dir, const char *target) {
   }
 
   struct DynArray *prompts = 0;
-  if ((error = validate_spec_json(parsed, &prompts))) {
+  if ((error = validate_spec_json(config, parsed, &prompts))) {
     fprintf(stderr, "%s", error->message);
     goto cleanup_parsed;
   }
diff --git a/src/config.c b/src/config.c
index aceecd1..2b6157d 100644
--- a/src/config.c
+++ b/src/config.c
@@ -17,11 +17,19 @@ struct Error *config_new(
   assert(target);
 
   if (cwd == 0) {
-    return ERROR_NEW(ERROR_CONFIG_ENV_CWD_INVALID, "Could not retrieve $CWD.");
+    return ERROR_NEW(
+      ERROR_CONFIG_ENV_CWD_INVALID,
+      ANSI_RED("ERROR"),
+      ": Could not retrieve ",
+      ANSI_CYAN("CWD"),
+      "."
+    );
   }
   if (root_dir == 0) {
     return ERROR_NEW(
-      ERROR_CONFIG_ENV_ROOT_DIR_INVALID, "No specified root directory."
+      ERROR_CONFIG_ENV_ROOT_DIR_INVALID,
+      ANSI_RED("ERROR"),
+      ": Could not find root directory."
     );
   }
 
@@ -35,18 +43,30 @@ struct Error *config_new(
   if (stat_res == -1) {
     if (errno == ENOENT) {
       error = ERROR_NEW(
-        ERROR_CONFIG_TARGET_NOT_FOUND, "Spec ", filepath, " not found."
+        ERROR_CONFIG_TARGET_NOT_FOUND,
+        ANSI_RED("ERROR"),
+        ": Could not find ",
+        ANSI_BLUE(target),
+        " spec."
       );
     } else {
       error = ERROR_NEW(
-        ERROR_CONFIG_TARGET_INVALID, "Spec ", filepath, " is invalid."
+        ERROR_CONFIG_TARGET_INVALID,
+        ANSI_RED("ERROR"),
+        ": ",
+        ANSI_BLUE(target),
+        " is invalid."
       );
     }
     goto cleanup;
   }
   if (!S_ISDIR(sb.st_mode)) {
     error = ERROR_NEW(
-      ERROR_CONFIG_TARGET_NOT_DIR, "Spec ", filepath, " is not a directory."
+      ERROR_CONFIG_TARGET_NOT_DIR,
+      ANSI_RED("ERROR"),
+      ": ",
+      ANSI_CYAN(filepath),
+      " is not a directory."
     );
     goto cleanup;
   }
diff --git a/src/evaluator.c b/src/evaluator.c
index efed46c..d2a139c 100644
--- a/src/evaluator.c
+++ b/src/evaluator.c
@@ -23,17 +23,20 @@ static struct Error *find_run_exec(const struct Config *const config) {
   if (stat_res == -1 && errno == ENOENT) {
     return ERROR_NEW(
       ERROR_EVALUATOR_RUNNER_NOT_FOUND,
-      "Could not find ",
-      config->target,
-      "/runner"
+      ANSI_RED("NOT_FOUND"),
+      ": Could not find ",
+      ANSI_BLUE(config->target, "/runner"),
+      "."
     );
   }
 
   if (!(sb.st_mode & S_IXUSR)) {
     return ERROR_NEW(
       ERROR_EVALUATOR_RUNNER_NOT_EXEC,
-      config->target,
-      "/runner is not executable."
+      ANSI_RED("ERROR"),
+      ": ",
+      ANSI_BLUE(config->target, "/runner"),
+      " is not executable."
     );
   }
 
@@ -42,20 +45,21 @@ static struct Error *find_run_exec(const struct Config *const config) {
 
 static const char *prompt_field(struct Field *field) {
   assert(field);
+  printf("%s", field->prompt);
+
+  char *response = calloc(1, 1024);
 
   switch (field->type) {
   case FT_TEXT:
-    printf("%s", field->prompt);
     // TODO: Probably want this buffer size to be a bit more dynamic.
-    char *input = calloc(1, 1024);
-    if (fgets(input, 1024, stdin)) {
-      size_t len = strlen(input);
-      if (len > 0 && input[len - 1] == '\n') {
-        input[len - 1] = '\0';
+    if (fgets(response, 1024, stdin)) {
+      size_t len = strlen(response);
+      if (len > 0 && response[len - 1] == '\n') {
+        response[len - 1] = '\0';
       }
-      return input;
+      return response;
     } else {
-      free(input);
+      free(response);
       return 0;
     }
   }
@@ -92,7 +96,9 @@ int evaluate_runner(
       const char *response = prompt_field(field);
       if (!response) {
         *error = ERROR_NEW(
-          ERROR_EVALUATOR_RESPONSE_INVALID, "Could not read in response."
+          ERROR_EVALUATOR_RESPONSE_INVALID,
+          ANSI_RED("ERROR"),
+          ": Could not read response."
         );
         string_buf_free(env_buf);
         return EXIT_FAILURE;
diff --git a/src/parser.c b/src/parser.c
index 0b32409..ef86e8f 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -19,7 +19,11 @@ static struct Error *find_spec_json(
   *handle = fopen(filepath, "r");
   if (!*handle && errno != ENOENT) {
     error = ERROR_NEW(
-      ERROR_PARSER_SPEC_JSON_INVALID, config->target, "/spec.json is invalid."
+      ERROR_PARSER_SPEC_JSON_INVALID,
+      ANSI_RED("ERROR"),
+      ": ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " is invalid."
     );
   }
 
@@ -60,7 +64,10 @@ struct Error *parse_spec_json(
   if (!*parsed) {
     return ERROR_NEW(
       ERROR_PARSER_SPEC_JSON_INVALID_SYNTAX,
-      "The spec.json file contains invalid JSON."
+      ANSI_RED("ERROR"),
+      ": ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " contains invalid JSON."
     );
   }
 
diff --git a/src/validator.c b/src/validator.c
index 5d8f65a..45292b8 100644
--- a/src/validator.c
+++ b/src/validator.c
@@ -4,27 +4,44 @@
 
 #include "string_utils.h"
 
-static struct Error *read_field(const cJSON *const field, struct Field **out) {
+static struct Error *read_field(
+  const struct Config *const config,
+  const cJSON *const field,
+  struct Field **out
+) {
   if (!cJSON_IsObject(field)) {
     return ERROR_NEW(
       ERROR_VALIDATOR_FIELD_NOT_OBJECT,
-      "Field \"",
-      field->string,
-      "\" is not a JSON object."
+      ANSI_RED("ERROR"),
+      ": Field ",
+      ANSI_PURPLE(field->string),
+      " in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " is not a JSON object."
     );
   }
 
   if (isdigit(field->string[0])) {
     return ERROR_NEW(
       ERROR_VALIDATOR_FIELD_NAME_INVALID,
-      "Field names may not begin with a digit."
+      ANSI_RED("ERROR"),
+      ": Field ",
+      ANSI_PURPLE(field->string),
+      " in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " may not begin with a digit."
     );
   } else {
     for (const char *c = field->string; *c; ++c) {
       if (*c != '_' && !isalnum(*c)) {
         return ERROR_NEW(
           ERROR_VALIDATOR_FIELD_NAME_INVALID,
-          "Field names must consist of alphanumeric characters or underscores."
+          ANSI_RED("ERROR"),
+          ": Field ",
+          ANSI_PURPLE(field->string),
+          " in ",
+          ANSI_BLUE(config->target, "/spec.json"),
+          " must consist of only alphanumeric characters and underscores."
         );
       }
     }
@@ -38,9 +55,14 @@ static struct Error *read_field(const cJSON *const field, struct Field **out) {
   if (!cJSON_IsString(type)) {
     error = ERROR_NEW(
       ERROR_VALIDATOR_FIELD_TYPE_INVALID,
-      "Field \"",
-      field->string,
-      "\" has non-string \"type\"."
+      ANSI_RED("ERROR"),
+      ": Field ",
+      ANSI_PURPLE(field->string),
+      " in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " has non-string ",
+      ANSI_PURPLE("type"),
+      "."
     );
     goto cleanup;
   }
@@ -50,9 +72,14 @@ static struct Error *read_field(const cJSON *const field, struct Field **out) {
   } else {
     error = ERROR_NEW(
       ERROR_VALIDATOR_FIELD_TYPE_UNKNOWN,
-      "Field \"",
-      field->string,
-      "\" has unknown \"type\"."
+      ANSI_RED("ERROR"),
+      ": Field ",
+      ANSI_PURPLE(field->string),
+      " in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " has unknown ",
+      ANSI_PURPLE("type"),
+      "."
     );
     goto cleanup;
   }
@@ -63,9 +90,14 @@ static struct Error *read_field(const cJSON *const field, struct Field **out) {
   } else {
     error = ERROR_NEW(
       ERROR_VALIDATOR_FIELD_PROMPT_INVALID,
-      "Field \"",
-      field->string,
-      "\" has non-string \"prompt\"."
+      ANSI_RED("ERROR"),
+      ": Field ",
+      ANSI_PURPLE(field->string),
+      " in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " has non-string ",
+      ANSI_PURPLE("prompt"),
+      "."
     );
     goto cleanup;
   }
@@ -78,7 +110,9 @@ cleanup:
 }
 
 struct Error *validate_spec_json(
-  const cJSON *const parsed, struct DynArray **fields
+  const struct Config *const config,
+  const cJSON *const parsed,
+  struct DynArray **fields
 ) {
   *fields = 0;
 
@@ -90,7 +124,10 @@ struct Error *validate_spec_json(
   if (!cJSON_IsObject(parsed)) {
     return ERROR_NEW(
       ERROR_VALIDATOR_TOP_LEVEL_NOT_OBJECT,
-      "Top-level JSON value in spec.json is not an object."
+      ANSI_RED("ERROR"),
+      ": Top-level JSON value in ",
+      ANSI_BLUE(config->target, "/spec.json"),
+      " is not an object."
     );
   }
 
@@ -102,7 +139,7 @@ struct Error *validate_spec_json(
   cJSON *child = parsed->child;
   while (child) {
     struct Field *field = 0;
-    error = read_field(child, &field);
+    error = read_field(config, child, &field);
     if (error) {
       goto cleanup;
     }
diff --git a/test/test_validator.h b/test/test_validator.h
index 02e21ac..345b29e 100644
--- a/test/test_validator.h
+++ b/test/test_validator.h
@@ -1,14 +1,18 @@
 #ifndef _BOOTSTRAP_TEST_VALIDATOR
 #define _BOOTSTRAP_TEST_VALIDATOR
 
+#include <unistd.h>
+
 #include "dyn_array.h"
 #include "sput.h"
+#include "string_utils.h"
 #include "validator.h"
 
 struct TestValidatorFixture {
   const char *json;
   struct DynArray *prompts;
   cJSON *parsed;
+  struct Config config;
 };
 
 static struct TestValidatorFixture *test_validator_setup(const char *json) {
@@ -17,6 +21,15 @@ static struct TestValidatorFixture *test_validator_setup(const char *json) {
   fixture->json = json;
   fixture->prompts = 0;
   fixture->parsed = cJSON_Parse(json);
+
+  char *cwd = getcwd(0, 0);
+  const char *segments[] = {cwd, "test", "specs"};
+  char *root_dir = join(sizeof(segments) / sizeof(char *), segments, '/');
+
+  fixture->config.cwd = cwd;
+  fixture->config.root_dir = root_dir;
+  fixture->config.target = "minimal_spec_json";
+
   return fixture;
 }
 
@@ -24,13 +37,16 @@ static void test_validator_teardown(struct TestValidatorFixture *fixture) {
   if (fixture->parsed) {
     cJSON_Delete(fixture->parsed);
   }
+  free((void *)fixture->config.cwd);
+  free((void *)fixture->config.root_dir);
   free(fixture);
 }
 
 static void test_validator_toplevel_not_object() {
   struct TestValidatorFixture *fixture = test_validator_setup("[]");
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_TOP_LEVEL_NOT_OBJECT, "top-level not object"
   );
@@ -43,7 +59,8 @@ static void test_validator_field_not_object() {
   struct TestValidatorFixture *fixture =
     test_validator_setup("{\"key\": \"$UNKNOWN\"}");
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_NOT_OBJECT, "field not object"
   );
@@ -61,7 +78,8 @@ static void test_validator_field_name_leading_digit() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_NAME_INVALID,
     "field name leading digit"
@@ -80,7 +98,8 @@ static void test_validator_field_name_non_alnum() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_NAME_INVALID, "field name non alnum"
   );
@@ -98,7 +117,8 @@ static void test_validator_field_type_invalid() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_TYPE_INVALID, "field type invalid"
   );
@@ -116,7 +136,8 @@ static void test_validator_field_type_unknown() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_TYPE_UNKNOWN, "field type unknown"
   );
@@ -135,7 +156,8 @@ static void test_validator_valid_type_ci() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(error == 0, "valid");
 
   test_validator_teardown(fixture);
@@ -151,7 +173,8 @@ static void test_validator_field_prompt_invalid() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(
     error->code == ERROR_VALIDATOR_FIELD_PROMPT_INVALID, "field prompt invalid"
   );
@@ -170,7 +193,8 @@ static void test_validator_valid() {
     "}"
   );
 
-  struct Error *error = validate_spec_json(fixture->parsed, &fixture->prompts);
+  struct Error *error =
+    validate_spec_json(&fixture->config, fixture->parsed, &fixture->prompts);
   sput_fail_unless(error == 0, "valid");
 
   test_validator_teardown(fixture);